Re: how "tight" should the crankshaft be with new bearings?
04-05-2004, 10:22 PM
#41
Guest
Posts: n/a
Re: how "tight" should the crankshaft be with new bearings?
Yeah they do, but you are dead wrong as to why they do it. It has nothing to
do with a small fillet increasing strength, it has to do with providing
clearance for the sides of the bearings. It is common sense (maybe this is
why you don't get it?) that a larger fillet increases strength. 'nuff said.
Chris
"Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote in
message news:Y3gcc.5641$Em4.3205@fe03.usenetserver.com...
> APRA Crankshaft specifications and tolerances!
>
> Racing engine shops use different tollerances, I've been there!
>
> Refinish King
>
>
> "c" <c@me.org> wrote in message
> news:lr6cc.13450$YC5.4462@twister.rdc-kc.rr.com...
> > Do you want me to use the book that I used for the 4 years that I worked
> in
> > a racing engine shop, or do you have a specific one in mind?
> >
> > Chris
> >
> >
> > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote in
> > message news:ak5cc.4342$Em4.4043@fe03.usenetserver.com...
> > > That's on new:
> > >
> > > not a regrind.
> > >
> > > So like I said, go look in the book that crankshaft grinders use.
You'll
> > be
> > > surprised, and more surprised at what they use for gauges to check the
> > > stones when they dress them.
> > >
> > > Refinish King
> > >
> > >
> > > "c" <c@me.org> wrote in message
> > > news:T%4cc.13442$YC5.10261@twister.rdc-kc.rr.com...
> > > > I guess Lunati and all of the other aftermarket crank manufacturers
> have
> > > > been doing it wrong all these years.
> > > >
> > > >
> http://www.holley.com/HiOctn/ProdLin...CSGenInfo.html
> > > >
> > > > It is common knowledge that a radius reduces the chance for a stress
> > crack
> > > > by ditributing the stresses evenly across the radius. The bigger the
> > > radius,
> > > > the more area to absorbs stresses.
> > > >
> > > > Chris
> > > >
> > > >
> > > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote
in
> > > > message news:SK4cc.4262$Em4.2316@fe03.usenetserver.com...
> > > > > It's called a bearing knife or bearing scraper:
> > > > >
> > > > > But, if you have an excessively large fillet radius, especially in
a
> > > cast
> > > > > iron crankshaft. that is the perfect place for a radial crack to
> > begin.
> > > > >
> > > > > The fillet radius should be ground with the stone dressed to the
> > propper
> > > > > radius for the crankshaft in the machine.
> > > > >
> > > > > Refinish King
> > > > >
> > > > >
> > > > > "HLS" <Sorry@nospam> wrote in message
> > > > > news:10719qskrk8ad4f@corp.supernews.com...
> > > > > >
> > > > > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com>
wrote
> > in
> > > > > > message news:%zNac.8164$Hs1.2774@fe03.usenetserver.com...
> > > > > > > If they did that:
> > > > > > >
> > > > > > > They're asking for a crack to happen. Read the manual, for
every
> > > > crank,
> > > > > > > there is a specified fillet radius!
> > > > > > >
> > > > > > > Refinish King
> > > > > >
> > > > > > A radiused fillet is less likely to crack than a sharply ground
> one,
> > > re
> > > > > the
> > > > > > stress raiser
> > > > > > phenomenon we have discussed before.. I think that more often
> than
> > > not,
> > > > > the
> > > > > > fillet
> > > > > > is not intented to be left overly large...it is probably a
result
> of
> > > > less
> > > > > > than precise machining.
> > > > > >
> > > > > > It can interfere with the edge of the bearing, just as "c" said.
> > > > > >
> > > > > > I never heard of anyone using narrower bearings, but they do
> > 'relieve'
> > > > the
> > > > > > edge of the
> > > > > > bearing where it might contact the fillet.
> > > > > >
> > > > > > Seems I have seen a special tool to do this, but don't have one
> > > myself.
> > > > > >
> > > > > >
> > > > >
> > > > >
> > > > >
> > > >
> > > >
> > >
> > >
> > >
> >
> >
>
>
>
do with a small fillet increasing strength, it has to do with providing
clearance for the sides of the bearings. It is common sense (maybe this is
why you don't get it?) that a larger fillet increases strength. 'nuff said.
Chris
"Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote in
message news:Y3gcc.5641$Em4.3205@fe03.usenetserver.com...
> APRA Crankshaft specifications and tolerances!
>
> Racing engine shops use different tollerances, I've been there!
>
> Refinish King
>
>
> "c" <c@me.org> wrote in message
> news:lr6cc.13450$YC5.4462@twister.rdc-kc.rr.com...
> > Do you want me to use the book that I used for the 4 years that I worked
> in
> > a racing engine shop, or do you have a specific one in mind?
> >
> > Chris
> >
> >
> > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote in
> > message news:ak5cc.4342$Em4.4043@fe03.usenetserver.com...
> > > That's on new:
> > >
> > > not a regrind.
> > >
> > > So like I said, go look in the book that crankshaft grinders use.
You'll
> > be
> > > surprised, and more surprised at what they use for gauges to check the
> > > stones when they dress them.
> > >
> > > Refinish King
> > >
> > >
> > > "c" <c@me.org> wrote in message
> > > news:T%4cc.13442$YC5.10261@twister.rdc-kc.rr.com...
> > > > I guess Lunati and all of the other aftermarket crank manufacturers
> have
> > > > been doing it wrong all these years.
> > > >
> > > >
> http://www.holley.com/HiOctn/ProdLin...CSGenInfo.html
> > > >
> > > > It is common knowledge that a radius reduces the chance for a stress
> > crack
> > > > by ditributing the stresses evenly across the radius. The bigger the
> > > radius,
> > > > the more area to absorbs stresses.
> > > >
> > > > Chris
> > > >
> > > >
> > > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote
in
> > > > message news:SK4cc.4262$Em4.2316@fe03.usenetserver.com...
> > > > > It's called a bearing knife or bearing scraper:
> > > > >
> > > > > But, if you have an excessively large fillet radius, especially in
a
> > > cast
> > > > > iron crankshaft. that is the perfect place for a radial crack to
> > begin.
> > > > >
> > > > > The fillet radius should be ground with the stone dressed to the
> > propper
> > > > > radius for the crankshaft in the machine.
> > > > >
> > > > > Refinish King
> > > > >
> > > > >
> > > > > "HLS" <Sorry@nospam> wrote in message
> > > > > news:10719qskrk8ad4f@corp.supernews.com...
> > > > > >
> > > > > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com>
wrote
> > in
> > > > > > message news:%zNac.8164$Hs1.2774@fe03.usenetserver.com...
> > > > > > > If they did that:
> > > > > > >
> > > > > > > They're asking for a crack to happen. Read the manual, for
every
> > > > crank,
> > > > > > > there is a specified fillet radius!
> > > > > > >
> > > > > > > Refinish King
> > > > > >
> > > > > > A radiused fillet is less likely to crack than a sharply ground
> one,
> > > re
> > > > > the
> > > > > > stress raiser
> > > > > > phenomenon we have discussed before.. I think that more often
> than
> > > not,
> > > > > the
> > > > > > fillet
> > > > > > is not intented to be left overly large...it is probably a
result
> of
> > > > less
> > > > > > than precise machining.
> > > > > >
> > > > > > It can interfere with the edge of the bearing, just as "c" said.
> > > > > >
> > > > > > I never heard of anyone using narrower bearings, but they do
> > 'relieve'
> > > > the
> > > > > > edge of the
> > > > > > bearing where it might contact the fillet.
> > > > > >
> > > > > > Seems I have seen a special tool to do this, but don't have one
> > > myself.
> > > > > >
> > > > > >
> > > > >
> > > > >
> > > > >
> > > >
> > > >
> > >
> > >
> > >
> >
> >
>
>
>
04-06-2004, 12:43 AM
#42
Guest
Posts: n/a
Re: how "tight" should the crankshaft be with new bearings?
In <jvocc.45753$z%1.23192@twister.rdc-kc.rr.com> c wrote:
> Yeah they do, but you are dead wrong as to why they do it. It has
> nothing to do with a small fillet increasing strength, it has to do
> with providing clearance for the sides of the bearings. It is common
> sense (maybe this is why you don't get it?) that a larger fillet
> increases strength. 'nuff said.
The fillet radius doesn't so much increase strength as it ------s out
the stresses on the crank. Without it, all of those stresses would
concentrate at the sharp corner leading to eventual fatigue failure.
This is why aircraft engine crankshafts have radiused journals.
----------------------------------------------------
Del Rawlins- del@_kills_spammers_rawlinsbrothers.org
Remove _kills_spammers_ to reply via email.
Unofficial Bearhawk FAQ website:
http://www.rawlinsbrothers.org/bhfaq/
> Yeah they do, but you are dead wrong as to why they do it. It has
> nothing to do with a small fillet increasing strength, it has to do
> with providing clearance for the sides of the bearings. It is common
> sense (maybe this is why you don't get it?) that a larger fillet
> increases strength. 'nuff said.
The fillet radius doesn't so much increase strength as it ------s out
the stresses on the crank. Without it, all of those stresses would
concentrate at the sharp corner leading to eventual fatigue failure.
This is why aircraft engine crankshafts have radiused journals.
----------------------------------------------------
Del Rawlins- del@_kills_spammers_rawlinsbrothers.org
Remove _kills_spammers_ to reply via email.
Unofficial Bearhawk FAQ website:
http://www.rawlinsbrothers.org/bhfaq/
04-06-2004, 12:43 AM
#43
Guest
Posts: n/a
Re: how "tight" should the crankshaft be with new bearings?
In <jvocc.45753$z%1.23192@twister.rdc-kc.rr.com> c wrote:
> Yeah they do, but you are dead wrong as to why they do it. It has
> nothing to do with a small fillet increasing strength, it has to do
> with providing clearance for the sides of the bearings. It is common
> sense (maybe this is why you don't get it?) that a larger fillet
> increases strength. 'nuff said.
The fillet radius doesn't so much increase strength as it ------s out
the stresses on the crank. Without it, all of those stresses would
concentrate at the sharp corner leading to eventual fatigue failure.
This is why aircraft engine crankshafts have radiused journals.
----------------------------------------------------
Del Rawlins- del@_kills_spammers_rawlinsbrothers.org
Remove _kills_spammers_ to reply via email.
Unofficial Bearhawk FAQ website:
http://www.rawlinsbrothers.org/bhfaq/
> Yeah they do, but you are dead wrong as to why they do it. It has
> nothing to do with a small fillet increasing strength, it has to do
> with providing clearance for the sides of the bearings. It is common
> sense (maybe this is why you don't get it?) that a larger fillet
> increases strength. 'nuff said.
The fillet radius doesn't so much increase strength as it ------s out
the stresses on the crank. Without it, all of those stresses would
concentrate at the sharp corner leading to eventual fatigue failure.
This is why aircraft engine crankshafts have radiused journals.
----------------------------------------------------
Del Rawlins- del@_kills_spammers_rawlinsbrothers.org
Remove _kills_spammers_ to reply via email.
Unofficial Bearhawk FAQ website:
http://www.rawlinsbrothers.org/bhfaq/
04-06-2004, 12:43 AM
#44
Guest
Posts: n/a
Re: how "tight" should the crankshaft be with new bearings?
In <jvocc.45753$z%1.23192@twister.rdc-kc.rr.com> c wrote:
> Yeah they do, but you are dead wrong as to why they do it. It has
> nothing to do with a small fillet increasing strength, it has to do
> with providing clearance for the sides of the bearings. It is common
> sense (maybe this is why you don't get it?) that a larger fillet
> increases strength. 'nuff said.
The fillet radius doesn't so much increase strength as it ------s out
the stresses on the crank. Without it, all of those stresses would
concentrate at the sharp corner leading to eventual fatigue failure.
This is why aircraft engine crankshafts have radiused journals.
----------------------------------------------------
Del Rawlins- del@_kills_spammers_rawlinsbrothers.org
Remove _kills_spammers_ to reply via email.
Unofficial Bearhawk FAQ website:
http://www.rawlinsbrothers.org/bhfaq/
> Yeah they do, but you are dead wrong as to why they do it. It has
> nothing to do with a small fillet increasing strength, it has to do
> with providing clearance for the sides of the bearings. It is common
> sense (maybe this is why you don't get it?) that a larger fillet
> increases strength. 'nuff said.
The fillet radius doesn't so much increase strength as it ------s out
the stresses on the crank. Without it, all of those stresses would
concentrate at the sharp corner leading to eventual fatigue failure.
This is why aircraft engine crankshafts have radiused journals.
----------------------------------------------------
Del Rawlins- del@_kills_spammers_rawlinsbrothers.org
Remove _kills_spammers_ to reply via email.
Unofficial Bearhawk FAQ website:
http://www.rawlinsbrothers.org/bhfaq/
04-06-2004, 12:43 AM
#45
Guest
Posts: n/a
Re: how "tight" should the crankshaft be with new bearings?
In <jvocc.45753$z%1.23192@twister.rdc-kc.rr.com> c wrote:
> Yeah they do, but you are dead wrong as to why they do it. It has
> nothing to do with a small fillet increasing strength, it has to do
> with providing clearance for the sides of the bearings. It is common
> sense (maybe this is why you don't get it?) that a larger fillet
> increases strength. 'nuff said.
The fillet radius doesn't so much increase strength as it ------s out
the stresses on the crank. Without it, all of those stresses would
concentrate at the sharp corner leading to eventual fatigue failure.
This is why aircraft engine crankshafts have radiused journals.
----------------------------------------------------
Del Rawlins- del@_kills_spammers_rawlinsbrothers.org
Remove _kills_spammers_ to reply via email.
Unofficial Bearhawk FAQ website:
http://www.rawlinsbrothers.org/bhfaq/
> Yeah they do, but you are dead wrong as to why they do it. It has
> nothing to do with a small fillet increasing strength, it has to do
> with providing clearance for the sides of the bearings. It is common
> sense (maybe this is why you don't get it?) that a larger fillet
> increases strength. 'nuff said.
The fillet radius doesn't so much increase strength as it ------s out
the stresses on the crank. Without it, all of those stresses would
concentrate at the sharp corner leading to eventual fatigue failure.
This is why aircraft engine crankshafts have radiused journals.
----------------------------------------------------
Del Rawlins- del@_kills_spammers_rawlinsbrothers.org
Remove _kills_spammers_ to reply via email.
Unofficial Bearhawk FAQ website:
http://www.rawlinsbrothers.org/bhfaq/
04-07-2004, 03:50 AM
#46
Guest
Posts: n/a
Re: how "tight" should the crankshaft be with new bearings?
No ----!
A regrind, is not a performance crank, and the OP said he was looking for
narrower bearings to clear the filler.
So put that in your pipe and smoke it.
He wasn't building a nitro funny car engine.
Next time, learn to read context, and not hammer your one sided point to
make yourself deeman, kid!
Refinish King
"c" <c@me.org> wrote in message
news:jvocc.45753$z%1.23192@twister.rdc-kc.rr.com...
> Yeah they do, but you are dead wrong as to why they do it. It has nothing
to
> do with a small fillet increasing strength, it has to do with providing
> clearance for the sides of the bearings. It is common sense (maybe this is
> why you don't get it?) that a larger fillet increases strength. 'nuff
said.
>
> Chris
>
>
> "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote in
> message news:Y3gcc.5641$Em4.3205@fe03.usenetserver.com...
> > APRA Crankshaft specifications and tolerances!
> >
> > Racing engine shops use different tollerances, I've been there!
> >
> > Refinish King
> >
> >
> > "c" <c@me.org> wrote in message
> > news:lr6cc.13450$YC5.4462@twister.rdc-kc.rr.com...
> > > Do you want me to use the book that I used for the 4 years that I
worked
> > in
> > > a racing engine shop, or do you have a specific one in mind?
> > >
> > > Chris
> > >
> > >
> > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote in
> > > message news:ak5cc.4342$Em4.4043@fe03.usenetserver.com...
> > > > That's on new:
> > > >
> > > > not a regrind.
> > > >
> > > > So like I said, go look in the book that crankshaft grinders use.
> You'll
> > > be
> > > > surprised, and more surprised at what they use for gauges to check
the
> > > > stones when they dress them.
> > > >
> > > > Refinish King
> > > >
> > > >
> > > > "c" <c@me.org> wrote in message
> > > > news:T%4cc.13442$YC5.10261@twister.rdc-kc.rr.com...
> > > > > I guess Lunati and all of the other aftermarket crank
manufacturers
> > have
> > > > > been doing it wrong all these years.
> > > > >
> > > > >
> > http://www.holley.com/HiOctn/ProdLin...CSGenInfo.html
> > > > >
> > > > > It is common knowledge that a radius reduces the chance for a
stress
> > > crack
> > > > > by ditributing the stresses evenly across the radius. The bigger
the
> > > > radius,
> > > > > the more area to absorbs stresses.
> > > > >
> > > > > Chris
> > > > >
> > > > >
> > > > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote
> in
> > > > > message news:SK4cc.4262$Em4.2316@fe03.usenetserver.com...
> > > > > > It's called a bearing knife or bearing scraper:
> > > > > >
> > > > > > But, if you have an excessively large fillet radius, especially
in
> a
> > > > cast
> > > > > > iron crankshaft. that is the perfect place for a radial crack to
> > > begin.
> > > > > >
> > > > > > The fillet radius should be ground with the stone dressed to the
> > > propper
> > > > > > radius for the crankshaft in the machine.
> > > > > >
> > > > > > Refinish King
> > > > > >
> > > > > >
> > > > > > "HLS" <Sorry@nospam> wrote in message
> > > > > > news:10719qskrk8ad4f@corp.supernews.com...
> > > > > > >
> > > > > > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com>
> wrote
> > > in
> > > > > > > message news:%zNac.8164$Hs1.2774@fe03.usenetserver.com...
> > > > > > > > If they did that:
> > > > > > > >
> > > > > > > > They're asking for a crack to happen. Read the manual, for
> every
> > > > > crank,
> > > > > > > > there is a specified fillet radius!
> > > > > > > >
> > > > > > > > Refinish King
> > > > > > >
> > > > > > > A radiused fillet is less likely to crack than a sharply
ground
> > one,
> > > > re
> > > > > > the
> > > > > > > stress raiser
> > > > > > > phenomenon we have discussed before.. I think that more often
> > than
> > > > not,
> > > > > > the
> > > > > > > fillet
> > > > > > > is not intented to be left overly large...it is probably a
> result
> > of
> > > > > less
> > > > > > > than precise machining.
> > > > > > >
> > > > > > > It can interfere with the edge of the bearing, just as "c"
said.
> > > > > > >
> > > > > > > I never heard of anyone using narrower bearings, but they do
> > > 'relieve'
> > > > > the
> > > > > > > edge of the
> > > > > > > bearing where it might contact the fillet.
> > > > > > >
> > > > > > > Seems I have seen a special tool to do this, but don't have
one
> > > > myself.
> > > > > > >
> > > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > >
> > > > >
> > > >
> > > >
> > > >
> > >
> > >
> >
> >
> >
>
>
A regrind, is not a performance crank, and the OP said he was looking for
narrower bearings to clear the filler.
So put that in your pipe and smoke it.
He wasn't building a nitro funny car engine.
Next time, learn to read context, and not hammer your one sided point to
make yourself deeman, kid!
Refinish King
"c" <c@me.org> wrote in message
news:jvocc.45753$z%1.23192@twister.rdc-kc.rr.com...
> Yeah they do, but you are dead wrong as to why they do it. It has nothing
to
> do with a small fillet increasing strength, it has to do with providing
> clearance for the sides of the bearings. It is common sense (maybe this is
> why you don't get it?) that a larger fillet increases strength. 'nuff
said.
>
> Chris
>
>
> "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote in
> message news:Y3gcc.5641$Em4.3205@fe03.usenetserver.com...
> > APRA Crankshaft specifications and tolerances!
> >
> > Racing engine shops use different tollerances, I've been there!
> >
> > Refinish King
> >
> >
> > "c" <c@me.org> wrote in message
> > news:lr6cc.13450$YC5.4462@twister.rdc-kc.rr.com...
> > > Do you want me to use the book that I used for the 4 years that I
worked
> > in
> > > a racing engine shop, or do you have a specific one in mind?
> > >
> > > Chris
> > >
> > >
> > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote in
> > > message news:ak5cc.4342$Em4.4043@fe03.usenetserver.com...
> > > > That's on new:
> > > >
> > > > not a regrind.
> > > >
> > > > So like I said, go look in the book that crankshaft grinders use.
> You'll
> > > be
> > > > surprised, and more surprised at what they use for gauges to check
the
> > > > stones when they dress them.
> > > >
> > > > Refinish King
> > > >
> > > >
> > > > "c" <c@me.org> wrote in message
> > > > news:T%4cc.13442$YC5.10261@twister.rdc-kc.rr.com...
> > > > > I guess Lunati and all of the other aftermarket crank
manufacturers
> > have
> > > > > been doing it wrong all these years.
> > > > >
> > > > >
> > http://www.holley.com/HiOctn/ProdLin...CSGenInfo.html
> > > > >
> > > > > It is common knowledge that a radius reduces the chance for a
stress
> > > crack
> > > > > by ditributing the stresses evenly across the radius. The bigger
the
> > > > radius,
> > > > > the more area to absorbs stresses.
> > > > >
> > > > > Chris
> > > > >
> > > > >
> > > > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote
> in
> > > > > message news:SK4cc.4262$Em4.2316@fe03.usenetserver.com...
> > > > > > It's called a bearing knife or bearing scraper:
> > > > > >
> > > > > > But, if you have an excessively large fillet radius, especially
in
> a
> > > > cast
> > > > > > iron crankshaft. that is the perfect place for a radial crack to
> > > begin.
> > > > > >
> > > > > > The fillet radius should be ground with the stone dressed to the
> > > propper
> > > > > > radius for the crankshaft in the machine.
> > > > > >
> > > > > > Refinish King
> > > > > >
> > > > > >
> > > > > > "HLS" <Sorry@nospam> wrote in message
> > > > > > news:10719qskrk8ad4f@corp.supernews.com...
> > > > > > >
> > > > > > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com>
> wrote
> > > in
> > > > > > > message news:%zNac.8164$Hs1.2774@fe03.usenetserver.com...
> > > > > > > > If they did that:
> > > > > > > >
> > > > > > > > They're asking for a crack to happen. Read the manual, for
> every
> > > > > crank,
> > > > > > > > there is a specified fillet radius!
> > > > > > > >
> > > > > > > > Refinish King
> > > > > > >
> > > > > > > A radiused fillet is less likely to crack than a sharply
ground
> > one,
> > > > re
> > > > > > the
> > > > > > > stress raiser
> > > > > > > phenomenon we have discussed before.. I think that more often
> > than
> > > > not,
> > > > > > the
> > > > > > > fillet
> > > > > > > is not intented to be left overly large...it is probably a
> result
> > of
> > > > > less
> > > > > > > than precise machining.
> > > > > > >
> > > > > > > It can interfere with the edge of the bearing, just as "c"
said.
> > > > > > >
> > > > > > > I never heard of anyone using narrower bearings, but they do
> > > 'relieve'
> > > > > the
> > > > > > > edge of the
> > > > > > > bearing where it might contact the fillet.
> > > > > > >
> > > > > > > Seems I have seen a special tool to do this, but don't have
one
> > > > myself.
> > > > > > >
> > > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > >
> > > > >
> > > >
> > > >
> > > >
> > >
> > >
> >
> >
> >
>
>
04-07-2004, 03:50 AM
#47
Guest
Posts: n/a
Re: how "tight" should the crankshaft be with new bearings?
No ----!
A regrind, is not a performance crank, and the OP said he was looking for
narrower bearings to clear the filler.
So put that in your pipe and smoke it.
He wasn't building a nitro funny car engine.
Next time, learn to read context, and not hammer your one sided point to
make yourself deeman, kid!
Refinish King
"c" <c@me.org> wrote in message
news:jvocc.45753$z%1.23192@twister.rdc-kc.rr.com...
> Yeah they do, but you are dead wrong as to why they do it. It has nothing
to
> do with a small fillet increasing strength, it has to do with providing
> clearance for the sides of the bearings. It is common sense (maybe this is
> why you don't get it?) that a larger fillet increases strength. 'nuff
said.
>
> Chris
>
>
> "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote in
> message news:Y3gcc.5641$Em4.3205@fe03.usenetserver.com...
> > APRA Crankshaft specifications and tolerances!
> >
> > Racing engine shops use different tollerances, I've been there!
> >
> > Refinish King
> >
> >
> > "c" <c@me.org> wrote in message
> > news:lr6cc.13450$YC5.4462@twister.rdc-kc.rr.com...
> > > Do you want me to use the book that I used for the 4 years that I
worked
> > in
> > > a racing engine shop, or do you have a specific one in mind?
> > >
> > > Chris
> > >
> > >
> > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote in
> > > message news:ak5cc.4342$Em4.4043@fe03.usenetserver.com...
> > > > That's on new:
> > > >
> > > > not a regrind.
> > > >
> > > > So like I said, go look in the book that crankshaft grinders use.
> You'll
> > > be
> > > > surprised, and more surprised at what they use for gauges to check
the
> > > > stones when they dress them.
> > > >
> > > > Refinish King
> > > >
> > > >
> > > > "c" <c@me.org> wrote in message
> > > > news:T%4cc.13442$YC5.10261@twister.rdc-kc.rr.com...
> > > > > I guess Lunati and all of the other aftermarket crank
manufacturers
> > have
> > > > > been doing it wrong all these years.
> > > > >
> > > > >
> > http://www.holley.com/HiOctn/ProdLin...CSGenInfo.html
> > > > >
> > > > > It is common knowledge that a radius reduces the chance for a
stress
> > > crack
> > > > > by ditributing the stresses evenly across the radius. The bigger
the
> > > > radius,
> > > > > the more area to absorbs stresses.
> > > > >
> > > > > Chris
> > > > >
> > > > >
> > > > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote
> in
> > > > > message news:SK4cc.4262$Em4.2316@fe03.usenetserver.com...
> > > > > > It's called a bearing knife or bearing scraper:
> > > > > >
> > > > > > But, if you have an excessively large fillet radius, especially
in
> a
> > > > cast
> > > > > > iron crankshaft. that is the perfect place for a radial crack to
> > > begin.
> > > > > >
> > > > > > The fillet radius should be ground with the stone dressed to the
> > > propper
> > > > > > radius for the crankshaft in the machine.
> > > > > >
> > > > > > Refinish King
> > > > > >
> > > > > >
> > > > > > "HLS" <Sorry@nospam> wrote in message
> > > > > > news:10719qskrk8ad4f@corp.supernews.com...
> > > > > > >
> > > > > > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com>
> wrote
> > > in
> > > > > > > message news:%zNac.8164$Hs1.2774@fe03.usenetserver.com...
> > > > > > > > If they did that:
> > > > > > > >
> > > > > > > > They're asking for a crack to happen. Read the manual, for
> every
> > > > > crank,
> > > > > > > > there is a specified fillet radius!
> > > > > > > >
> > > > > > > > Refinish King
> > > > > > >
> > > > > > > A radiused fillet is less likely to crack than a sharply
ground
> > one,
> > > > re
> > > > > > the
> > > > > > > stress raiser
> > > > > > > phenomenon we have discussed before.. I think that more often
> > than
> > > > not,
> > > > > > the
> > > > > > > fillet
> > > > > > > is not intented to be left overly large...it is probably a
> result
> > of
> > > > > less
> > > > > > > than precise machining.
> > > > > > >
> > > > > > > It can interfere with the edge of the bearing, just as "c"
said.
> > > > > > >
> > > > > > > I never heard of anyone using narrower bearings, but they do
> > > 'relieve'
> > > > > the
> > > > > > > edge of the
> > > > > > > bearing where it might contact the fillet.
> > > > > > >
> > > > > > > Seems I have seen a special tool to do this, but don't have
one
> > > > myself.
> > > > > > >
> > > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > >
> > > > >
> > > >
> > > >
> > > >
> > >
> > >
> >
> >
> >
>
>
A regrind, is not a performance crank, and the OP said he was looking for
narrower bearings to clear the filler.
So put that in your pipe and smoke it.
He wasn't building a nitro funny car engine.
Next time, learn to read context, and not hammer your one sided point to
make yourself deeman, kid!
Refinish King
"c" <c@me.org> wrote in message
news:jvocc.45753$z%1.23192@twister.rdc-kc.rr.com...
> Yeah they do, but you are dead wrong as to why they do it. It has nothing
to
> do with a small fillet increasing strength, it has to do with providing
> clearance for the sides of the bearings. It is common sense (maybe this is
> why you don't get it?) that a larger fillet increases strength. 'nuff
said.
>
> Chris
>
>
> "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote in
> message news:Y3gcc.5641$Em4.3205@fe03.usenetserver.com...
> > APRA Crankshaft specifications and tolerances!
> >
> > Racing engine shops use different tollerances, I've been there!
> >
> > Refinish King
> >
> >
> > "c" <c@me.org> wrote in message
> > news:lr6cc.13450$YC5.4462@twister.rdc-kc.rr.com...
> > > Do you want me to use the book that I used for the 4 years that I
worked
> > in
> > > a racing engine shop, or do you have a specific one in mind?
> > >
> > > Chris
> > >
> > >
> > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote in
> > > message news:ak5cc.4342$Em4.4043@fe03.usenetserver.com...
> > > > That's on new:
> > > >
> > > > not a regrind.
> > > >
> > > > So like I said, go look in the book that crankshaft grinders use.
> You'll
> > > be
> > > > surprised, and more surprised at what they use for gauges to check
the
> > > > stones when they dress them.
> > > >
> > > > Refinish King
> > > >
> > > >
> > > > "c" <c@me.org> wrote in message
> > > > news:T%4cc.13442$YC5.10261@twister.rdc-kc.rr.com...
> > > > > I guess Lunati and all of the other aftermarket crank
manufacturers
> > have
> > > > > been doing it wrong all these years.
> > > > >
> > > > >
> > http://www.holley.com/HiOctn/ProdLin...CSGenInfo.html
> > > > >
> > > > > It is common knowledge that a radius reduces the chance for a
stress
> > > crack
> > > > > by ditributing the stresses evenly across the radius. The bigger
the
> > > > radius,
> > > > > the more area to absorbs stresses.
> > > > >
> > > > > Chris
> > > > >
> > > > >
> > > > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote
> in
> > > > > message news:SK4cc.4262$Em4.2316@fe03.usenetserver.com...
> > > > > > It's called a bearing knife or bearing scraper:
> > > > > >
> > > > > > But, if you have an excessively large fillet radius, especially
in
> a
> > > > cast
> > > > > > iron crankshaft. that is the perfect place for a radial crack to
> > > begin.
> > > > > >
> > > > > > The fillet radius should be ground with the stone dressed to the
> > > propper
> > > > > > radius for the crankshaft in the machine.
> > > > > >
> > > > > > Refinish King
> > > > > >
> > > > > >
> > > > > > "HLS" <Sorry@nospam> wrote in message
> > > > > > news:10719qskrk8ad4f@corp.supernews.com...
> > > > > > >
> > > > > > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com>
> wrote
> > > in
> > > > > > > message news:%zNac.8164$Hs1.2774@fe03.usenetserver.com...
> > > > > > > > If they did that:
> > > > > > > >
> > > > > > > > They're asking for a crack to happen. Read the manual, for
> every
> > > > > crank,
> > > > > > > > there is a specified fillet radius!
> > > > > > > >
> > > > > > > > Refinish King
> > > > > > >
> > > > > > > A radiused fillet is less likely to crack than a sharply
ground
> > one,
> > > > re
> > > > > > the
> > > > > > > stress raiser
> > > > > > > phenomenon we have discussed before.. I think that more often
> > than
> > > > not,
> > > > > > the
> > > > > > > fillet
> > > > > > > is not intented to be left overly large...it is probably a
> result
> > of
> > > > > less
> > > > > > > than precise machining.
> > > > > > >
> > > > > > > It can interfere with the edge of the bearing, just as "c"
said.
> > > > > > >
> > > > > > > I never heard of anyone using narrower bearings, but they do
> > > 'relieve'
> > > > > the
> > > > > > > edge of the
> > > > > > > bearing where it might contact the fillet.
> > > > > > >
> > > > > > > Seems I have seen a special tool to do this, but don't have
one
> > > > myself.
> > > > > > >
> > > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > >
> > > > >
> > > >
> > > >
> > > >
> > >
> > >
> >
> >
> >
>
>
04-07-2004, 03:50 AM
#48
Guest
Posts: n/a
Re: how "tight" should the crankshaft be with new bearings?
No ----!
A regrind, is not a performance crank, and the OP said he was looking for
narrower bearings to clear the filler.
So put that in your pipe and smoke it.
He wasn't building a nitro funny car engine.
Next time, learn to read context, and not hammer your one sided point to
make yourself deeman, kid!
Refinish King
"c" <c@me.org> wrote in message
news:jvocc.45753$z%1.23192@twister.rdc-kc.rr.com...
> Yeah they do, but you are dead wrong as to why they do it. It has nothing
to
> do with a small fillet increasing strength, it has to do with providing
> clearance for the sides of the bearings. It is common sense (maybe this is
> why you don't get it?) that a larger fillet increases strength. 'nuff
said.
>
> Chris
>
>
> "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote in
> message news:Y3gcc.5641$Em4.3205@fe03.usenetserver.com...
> > APRA Crankshaft specifications and tolerances!
> >
> > Racing engine shops use different tollerances, I've been there!
> >
> > Refinish King
> >
> >
> > "c" <c@me.org> wrote in message
> > news:lr6cc.13450$YC5.4462@twister.rdc-kc.rr.com...
> > > Do you want me to use the book that I used for the 4 years that I
worked
> > in
> > > a racing engine shop, or do you have a specific one in mind?
> > >
> > > Chris
> > >
> > >
> > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote in
> > > message news:ak5cc.4342$Em4.4043@fe03.usenetserver.com...
> > > > That's on new:
> > > >
> > > > not a regrind.
> > > >
> > > > So like I said, go look in the book that crankshaft grinders use.
> You'll
> > > be
> > > > surprised, and more surprised at what they use for gauges to check
the
> > > > stones when they dress them.
> > > >
> > > > Refinish King
> > > >
> > > >
> > > > "c" <c@me.org> wrote in message
> > > > news:T%4cc.13442$YC5.10261@twister.rdc-kc.rr.com...
> > > > > I guess Lunati and all of the other aftermarket crank
manufacturers
> > have
> > > > > been doing it wrong all these years.
> > > > >
> > > > >
> > http://www.holley.com/HiOctn/ProdLin...CSGenInfo.html
> > > > >
> > > > > It is common knowledge that a radius reduces the chance for a
stress
> > > crack
> > > > > by ditributing the stresses evenly across the radius. The bigger
the
> > > > radius,
> > > > > the more area to absorbs stresses.
> > > > >
> > > > > Chris
> > > > >
> > > > >
> > > > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote
> in
> > > > > message news:SK4cc.4262$Em4.2316@fe03.usenetserver.com...
> > > > > > It's called a bearing knife or bearing scraper:
> > > > > >
> > > > > > But, if you have an excessively large fillet radius, especially
in
> a
> > > > cast
> > > > > > iron crankshaft. that is the perfect place for a radial crack to
> > > begin.
> > > > > >
> > > > > > The fillet radius should be ground with the stone dressed to the
> > > propper
> > > > > > radius for the crankshaft in the machine.
> > > > > >
> > > > > > Refinish King
> > > > > >
> > > > > >
> > > > > > "HLS" <Sorry@nospam> wrote in message
> > > > > > news:10719qskrk8ad4f@corp.supernews.com...
> > > > > > >
> > > > > > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com>
> wrote
> > > in
> > > > > > > message news:%zNac.8164$Hs1.2774@fe03.usenetserver.com...
> > > > > > > > If they did that:
> > > > > > > >
> > > > > > > > They're asking for a crack to happen. Read the manual, for
> every
> > > > > crank,
> > > > > > > > there is a specified fillet radius!
> > > > > > > >
> > > > > > > > Refinish King
> > > > > > >
> > > > > > > A radiused fillet is less likely to crack than a sharply
ground
> > one,
> > > > re
> > > > > > the
> > > > > > > stress raiser
> > > > > > > phenomenon we have discussed before.. I think that more often
> > than
> > > > not,
> > > > > > the
> > > > > > > fillet
> > > > > > > is not intented to be left overly large...it is probably a
> result
> > of
> > > > > less
> > > > > > > than precise machining.
> > > > > > >
> > > > > > > It can interfere with the edge of the bearing, just as "c"
said.
> > > > > > >
> > > > > > > I never heard of anyone using narrower bearings, but they do
> > > 'relieve'
> > > > > the
> > > > > > > edge of the
> > > > > > > bearing where it might contact the fillet.
> > > > > > >
> > > > > > > Seems I have seen a special tool to do this, but don't have
one
> > > > myself.
> > > > > > >
> > > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > >
> > > > >
> > > >
> > > >
> > > >
> > >
> > >
> >
> >
> >
>
>
A regrind, is not a performance crank, and the OP said he was looking for
narrower bearings to clear the filler.
So put that in your pipe and smoke it.
He wasn't building a nitro funny car engine.
Next time, learn to read context, and not hammer your one sided point to
make yourself deeman, kid!
Refinish King
"c" <c@me.org> wrote in message
news:jvocc.45753$z%1.23192@twister.rdc-kc.rr.com...
> Yeah they do, but you are dead wrong as to why they do it. It has nothing
to
> do with a small fillet increasing strength, it has to do with providing
> clearance for the sides of the bearings. It is common sense (maybe this is
> why you don't get it?) that a larger fillet increases strength. 'nuff
said.
>
> Chris
>
>
> "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote in
> message news:Y3gcc.5641$Em4.3205@fe03.usenetserver.com...
> > APRA Crankshaft specifications and tolerances!
> >
> > Racing engine shops use different tollerances, I've been there!
> >
> > Refinish King
> >
> >
> > "c" <c@me.org> wrote in message
> > news:lr6cc.13450$YC5.4462@twister.rdc-kc.rr.com...
> > > Do you want me to use the book that I used for the 4 years that I
worked
> > in
> > > a racing engine shop, or do you have a specific one in mind?
> > >
> > > Chris
> > >
> > >
> > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote in
> > > message news:ak5cc.4342$Em4.4043@fe03.usenetserver.com...
> > > > That's on new:
> > > >
> > > > not a regrind.
> > > >
> > > > So like I said, go look in the book that crankshaft grinders use.
> You'll
> > > be
> > > > surprised, and more surprised at what they use for gauges to check
the
> > > > stones when they dress them.
> > > >
> > > > Refinish King
> > > >
> > > >
> > > > "c" <c@me.org> wrote in message
> > > > news:T%4cc.13442$YC5.10261@twister.rdc-kc.rr.com...
> > > > > I guess Lunati and all of the other aftermarket crank
manufacturers
> > have
> > > > > been doing it wrong all these years.
> > > > >
> > > > >
> > http://www.holley.com/HiOctn/ProdLin...CSGenInfo.html
> > > > >
> > > > > It is common knowledge that a radius reduces the chance for a
stress
> > > crack
> > > > > by ditributing the stresses evenly across the radius. The bigger
the
> > > > radius,
> > > > > the more area to absorbs stresses.
> > > > >
> > > > > Chris
> > > > >
> > > > >
> > > > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote
> in
> > > > > message news:SK4cc.4262$Em4.2316@fe03.usenetserver.com...
> > > > > > It's called a bearing knife or bearing scraper:
> > > > > >
> > > > > > But, if you have an excessively large fillet radius, especially
in
> a
> > > > cast
> > > > > > iron crankshaft. that is the perfect place for a radial crack to
> > > begin.
> > > > > >
> > > > > > The fillet radius should be ground with the stone dressed to the
> > > propper
> > > > > > radius for the crankshaft in the machine.
> > > > > >
> > > > > > Refinish King
> > > > > >
> > > > > >
> > > > > > "HLS" <Sorry@nospam> wrote in message
> > > > > > news:10719qskrk8ad4f@corp.supernews.com...
> > > > > > >
> > > > > > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com>
> wrote
> > > in
> > > > > > > message news:%zNac.8164$Hs1.2774@fe03.usenetserver.com...
> > > > > > > > If they did that:
> > > > > > > >
> > > > > > > > They're asking for a crack to happen. Read the manual, for
> every
> > > > > crank,
> > > > > > > > there is a specified fillet radius!
> > > > > > > >
> > > > > > > > Refinish King
> > > > > > >
> > > > > > > A radiused fillet is less likely to crack than a sharply
ground
> > one,
> > > > re
> > > > > > the
> > > > > > > stress raiser
> > > > > > > phenomenon we have discussed before.. I think that more often
> > than
> > > > not,
> > > > > > the
> > > > > > > fillet
> > > > > > > is not intented to be left overly large...it is probably a
> result
> > of
> > > > > less
> > > > > > > than precise machining.
> > > > > > >
> > > > > > > It can interfere with the edge of the bearing, just as "c"
said.
> > > > > > >
> > > > > > > I never heard of anyone using narrower bearings, but they do
> > > 'relieve'
> > > > > the
> > > > > > > edge of the
> > > > > > > bearing where it might contact the fillet.
> > > > > > >
> > > > > > > Seems I have seen a special tool to do this, but don't have
one
> > > > myself.
> > > > > > >
> > > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > >
> > > > >
> > > >
> > > >
> > > >
> > >
> > >
> >
> >
> >
>
>
04-07-2004, 03:50 AM
#49
Guest
Posts: n/a
Re: how "tight" should the crankshaft be with new bearings?
No ----!
A regrind, is not a performance crank, and the OP said he was looking for
narrower bearings to clear the filler.
So put that in your pipe and smoke it.
He wasn't building a nitro funny car engine.
Next time, learn to read context, and not hammer your one sided point to
make yourself deeman, kid!
Refinish King
"c" <c@me.org> wrote in message
news:jvocc.45753$z%1.23192@twister.rdc-kc.rr.com...
> Yeah they do, but you are dead wrong as to why they do it. It has nothing
to
> do with a small fillet increasing strength, it has to do with providing
> clearance for the sides of the bearings. It is common sense (maybe this is
> why you don't get it?) that a larger fillet increases strength. 'nuff
said.
>
> Chris
>
>
> "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote in
> message news:Y3gcc.5641$Em4.3205@fe03.usenetserver.com...
> > APRA Crankshaft specifications and tolerances!
> >
> > Racing engine shops use different tollerances, I've been there!
> >
> > Refinish King
> >
> >
> > "c" <c@me.org> wrote in message
> > news:lr6cc.13450$YC5.4462@twister.rdc-kc.rr.com...
> > > Do you want me to use the book that I used for the 4 years that I
worked
> > in
> > > a racing engine shop, or do you have a specific one in mind?
> > >
> > > Chris
> > >
> > >
> > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote in
> > > message news:ak5cc.4342$Em4.4043@fe03.usenetserver.com...
> > > > That's on new:
> > > >
> > > > not a regrind.
> > > >
> > > > So like I said, go look in the book that crankshaft grinders use.
> You'll
> > > be
> > > > surprised, and more surprised at what they use for gauges to check
the
> > > > stones when they dress them.
> > > >
> > > > Refinish King
> > > >
> > > >
> > > > "c" <c@me.org> wrote in message
> > > > news:T%4cc.13442$YC5.10261@twister.rdc-kc.rr.com...
> > > > > I guess Lunati and all of the other aftermarket crank
manufacturers
> > have
> > > > > been doing it wrong all these years.
> > > > >
> > > > >
> > http://www.holley.com/HiOctn/ProdLin...CSGenInfo.html
> > > > >
> > > > > It is common knowledge that a radius reduces the chance for a
stress
> > > crack
> > > > > by ditributing the stresses evenly across the radius. The bigger
the
> > > > radius,
> > > > > the more area to absorbs stresses.
> > > > >
> > > > > Chris
> > > > >
> > > > >
> > > > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote
> in
> > > > > message news:SK4cc.4262$Em4.2316@fe03.usenetserver.com...
> > > > > > It's called a bearing knife or bearing scraper:
> > > > > >
> > > > > > But, if you have an excessively large fillet radius, especially
in
> a
> > > > cast
> > > > > > iron crankshaft. that is the perfect place for a radial crack to
> > > begin.
> > > > > >
> > > > > > The fillet radius should be ground with the stone dressed to the
> > > propper
> > > > > > radius for the crankshaft in the machine.
> > > > > >
> > > > > > Refinish King
> > > > > >
> > > > > >
> > > > > > "HLS" <Sorry@nospam> wrote in message
> > > > > > news:10719qskrk8ad4f@corp.supernews.com...
> > > > > > >
> > > > > > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com>
> wrote
> > > in
> > > > > > > message news:%zNac.8164$Hs1.2774@fe03.usenetserver.com...
> > > > > > > > If they did that:
> > > > > > > >
> > > > > > > > They're asking for a crack to happen. Read the manual, for
> every
> > > > > crank,
> > > > > > > > there is a specified fillet radius!
> > > > > > > >
> > > > > > > > Refinish King
> > > > > > >
> > > > > > > A radiused fillet is less likely to crack than a sharply
ground
> > one,
> > > > re
> > > > > > the
> > > > > > > stress raiser
> > > > > > > phenomenon we have discussed before.. I think that more often
> > than
> > > > not,
> > > > > > the
> > > > > > > fillet
> > > > > > > is not intented to be left overly large...it is probably a
> result
> > of
> > > > > less
> > > > > > > than precise machining.
> > > > > > >
> > > > > > > It can interfere with the edge of the bearing, just as "c"
said.
> > > > > > >
> > > > > > > I never heard of anyone using narrower bearings, but they do
> > > 'relieve'
> > > > > the
> > > > > > > edge of the
> > > > > > > bearing where it might contact the fillet.
> > > > > > >
> > > > > > > Seems I have seen a special tool to do this, but don't have
one
> > > > myself.
> > > > > > >
> > > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > >
> > > > >
> > > >
> > > >
> > > >
> > >
> > >
> >
> >
> >
>
>
A regrind, is not a performance crank, and the OP said he was looking for
narrower bearings to clear the filler.
So put that in your pipe and smoke it.
He wasn't building a nitro funny car engine.
Next time, learn to read context, and not hammer your one sided point to
make yourself deeman, kid!
Refinish King
"c" <c@me.org> wrote in message
news:jvocc.45753$z%1.23192@twister.rdc-kc.rr.com...
> Yeah they do, but you are dead wrong as to why they do it. It has nothing
to
> do with a small fillet increasing strength, it has to do with providing
> clearance for the sides of the bearings. It is common sense (maybe this is
> why you don't get it?) that a larger fillet increases strength. 'nuff
said.
>
> Chris
>
>
> "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote in
> message news:Y3gcc.5641$Em4.3205@fe03.usenetserver.com...
> > APRA Crankshaft specifications and tolerances!
> >
> > Racing engine shops use different tollerances, I've been there!
> >
> > Refinish King
> >
> >
> > "c" <c@me.org> wrote in message
> > news:lr6cc.13450$YC5.4462@twister.rdc-kc.rr.com...
> > > Do you want me to use the book that I used for the 4 years that I
worked
> > in
> > > a racing engine shop, or do you have a specific one in mind?
> > >
> > > Chris
> > >
> > >
> > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote in
> > > message news:ak5cc.4342$Em4.4043@fe03.usenetserver.com...
> > > > That's on new:
> > > >
> > > > not a regrind.
> > > >
> > > > So like I said, go look in the book that crankshaft grinders use.
> You'll
> > > be
> > > > surprised, and more surprised at what they use for gauges to check
the
> > > > stones when they dress them.
> > > >
> > > > Refinish King
> > > >
> > > >
> > > > "c" <c@me.org> wrote in message
> > > > news:T%4cc.13442$YC5.10261@twister.rdc-kc.rr.com...
> > > > > I guess Lunati and all of the other aftermarket crank
manufacturers
> > have
> > > > > been doing it wrong all these years.
> > > > >
> > > > >
> > http://www.holley.com/HiOctn/ProdLin...CSGenInfo.html
> > > > >
> > > > > It is common knowledge that a radius reduces the chance for a
stress
> > > crack
> > > > > by ditributing the stresses evenly across the radius. The bigger
the
> > > > radius,
> > > > > the more area to absorbs stresses.
> > > > >
> > > > > Chris
> > > > >
> > > > >
> > > > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com> wrote
> in
> > > > > message news:SK4cc.4262$Em4.2316@fe03.usenetserver.com...
> > > > > > It's called a bearing knife or bearing scraper:
> > > > > >
> > > > > > But, if you have an excessively large fillet radius, especially
in
> a
> > > > cast
> > > > > > iron crankshaft. that is the perfect place for a radial crack to
> > > begin.
> > > > > >
> > > > > > The fillet radius should be ground with the stone dressed to the
> > > propper
> > > > > > radius for the crankshaft in the machine.
> > > > > >
> > > > > > Refinish King
> > > > > >
> > > > > >
> > > > > > "HLS" <Sorry@nospam> wrote in message
> > > > > > news:10719qskrk8ad4f@corp.supernews.com...
> > > > > > >
> > > > > > > "Refinish King" <noneofyourbusiness@neveryoumind.nospam.com>
> wrote
> > > in
> > > > > > > message news:%zNac.8164$Hs1.2774@fe03.usenetserver.com...
> > > > > > > > If they did that:
> > > > > > > >
> > > > > > > > They're asking for a crack to happen. Read the manual, for
> every
> > > > > crank,
> > > > > > > > there is a specified fillet radius!
> > > > > > > >
> > > > > > > > Refinish King
> > > > > > >
> > > > > > > A radiused fillet is less likely to crack than a sharply
ground
> > one,
> > > > re
> > > > > > the
> > > > > > > stress raiser
> > > > > > > phenomenon we have discussed before.. I think that more often
> > than
> > > > not,
> > > > > > the
> > > > > > > fillet
> > > > > > > is not intented to be left overly large...it is probably a
> result
> > of
> > > > > less
> > > > > > > than precise machining.
> > > > > > >
> > > > > > > It can interfere with the edge of the bearing, just as "c"
said.
> > > > > > >
> > > > > > > I never heard of anyone using narrower bearings, but they do
> > > 'relieve'
> > > > > the
> > > > > > > edge of the
> > > > > > > bearing where it might contact the fillet.
> > > > > > >
> > > > > > > Seems I have seen a special tool to do this, but don't have
one
> > > > myself.
> > > > > > >
> > > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > >
> > > > >
> > > >
> > > >
> > > >
> > >
> > >
> >
> >
> >
>
>
04-07-2004, 03:53 AM
#50
Guest
Posts: n/a
Re: how "tight" should the crankshaft be with new bearings?
This is the world according to C:
news group. He wanted his point known, disregarding the original post saying
he required narrower bearings. But, there would have to have been some
submerge arc welding on that crank to make the fillet narrower?
Grinding makes the fillet area wider, does it not?
Refinish King
"Del Rawlins" <del@_kills_spammers_rawlinsbrothers.org> wrote in message
news:20040405204257046-0800@enews.newsguy.com...
> In <jvocc.45753$z%1.23192@twister.rdc-kc.rr.com> c wrote:
> > Yeah they do, but you are dead wrong as to why they do it. It has
> > nothing to do with a small fillet increasing strength, it has to do
> > with providing clearance for the sides of the bearings. It is common
> > sense (maybe this is why you don't get it?) that a larger fillet
> > increases strength. 'nuff said.
>
> The fillet radius doesn't so much increase strength as it ------s out
> the stresses on the crank. Without it, all of those stresses would
> concentrate at the sharp corner leading to eventual fatigue failure.
> This is why aircraft engine crankshafts have radiused journals.
>
> ----------------------------------------------------
> Del Rawlins- del@_kills_spammers_rawlinsbrothers.org
> Remove _kills_spammers_ to reply via email.
> Unofficial Bearhawk FAQ website:
> http://www.rawlinsbrothers.org/bhfaq/
news group. He wanted his point known, disregarding the original post saying
he required narrower bearings. But, there would have to have been some
submerge arc welding on that crank to make the fillet narrower?
Grinding makes the fillet area wider, does it not?
Refinish King
"Del Rawlins" <del@_kills_spammers_rawlinsbrothers.org> wrote in message
news:20040405204257046-0800@enews.newsguy.com...
> In <jvocc.45753$z%1.23192@twister.rdc-kc.rr.com> c wrote:
> > Yeah they do, but you are dead wrong as to why they do it. It has
> > nothing to do with a small fillet increasing strength, it has to do
> > with providing clearance for the sides of the bearings. It is common
> > sense (maybe this is why you don't get it?) that a larger fillet
> > increases strength. 'nuff said.
>
> The fillet radius doesn't so much increase strength as it ------s out
> the stresses on the crank. Without it, all of those stresses would
> concentrate at the sharp corner leading to eventual fatigue failure.
> This is why aircraft engine crankshafts have radiused journals.
>
> ----------------------------------------------------
> Del Rawlins- del@_kills_spammers_rawlinsbrothers.org
> Remove _kills_spammers_ to reply via email.
> Unofficial Bearhawk FAQ website:
> http://www.rawlinsbrothers.org/bhfaq/