Re: Rear Bumper Design Feedback
 

On Mar 15, 12:44 pm, "Jon" <jongodd...@gmail.com> wrote:
> Looks good, and looks like solid feedback so far.
>
> Just one thought: you might want to look into extending the shackle
> mounts through the bumper, perhaps to use as the inner mounting
> plate? I'm only mentioning this as others have pointed out the
> relative weight and high thickness of the tubing you proposed @ 1/4"
> -- if you do indeed go thinner, and if I'm correct in seeing the
> shackle mounts as stubs that weld to the surface, you're looking at a
> slightly more complicated weld (very thick metal welded to relatively
> thin tubing - tubing heats much quicker), combined with the potential
> for deformation on a flat surface -- perhaps only on rather oblique
> pulls.
>
> Conversely you could just extend them through both faces for strength
> and keep the channel/angle iron setup for mounting, but I'd skip the
> bolting of the angles to the channel -- since nothing is ever drilled
> perfect and something might be a tiny bit tweaked, I'd put together
> the frame mounting system, position the bumper (complete with channel
> affixed), and tack it all in place. Unbolt the assembly, and then
> weld up the channel/angle junction good and solid.
>
> Just some ideas - - Jon
>
>
> - Show quoted text -

First of all, I want to thank everyone for their design feedback. I'm
starting to move forward with a slight re-design based on the inputs.
I plan on taking some measurments sunday to get things a little more
accurate, plus to give me a better idea of what's feasable and what is
not. Here are the plans so far though.

1) Receiver Hitch Pin. I was planning on having the hitch pin
placement on the rear of the bumper. That is, if there is enough
clearance there. I'll figure that detail out once I get some
measurements. For now, the receiver hitch is more or less a
placeholder.

2) Safety chain hookups. Good catch by everyone, I'll be sure and
add these.

3) I'm going to change my design to use 3/16" thick steel instead of
1/4". I figure more give is a good thing, plus it's an overall weight
savings.

4) Shackle mounts I will plan on having go through the bumper and
attach to both the front and the back walls. Extra durability is a
plus, and also, good point about the welding and deformation.
Hopefully this will help out.

5) The crush sleeves are a good idea, I'll be sure and incorporate
that.

6) As for the frame connection/mounting. I'll have a better idea of
that after this weekend and taking some measurements.

7) Tow hooks, I'm not sure these are really necessary with the
shackles, seems like overkill to have both. Maybe I'm missing
something, let me know if I am.

8) Rear lights are a good idea. As for the best place to put them,
I'm not sure. Any suggestions are welcome.

----------
Tim J
Chassis - 1984 CJ7
Engine - SBC 305 http://www.4x4owners.com

Re: Rear Bumper Design Feedback
 

On Mar 15, 12:44 pm, "Jon" <jongodd...@gmail.com> wrote:
> Looks good, and looks like solid feedback so far.
>
> Just one thought: you might want to look into extending the shackle
> mounts through the bumper, perhaps to use as the inner mounting
> plate? I'm only mentioning this as others have pointed out the
> relative weight and high thickness of the tubing you proposed @ 1/4"
> -- if you do indeed go thinner, and if I'm correct in seeing the
> shackle mounts as stubs that weld to the surface, you're looking at a
> slightly more complicated weld (very thick metal welded to relatively
> thin tubing - tubing heats much quicker), combined with the potential
> for deformation on a flat surface -- perhaps only on rather oblique
> pulls.
>
> Conversely you could just extend them through both faces for strength
> and keep the channel/angle iron setup for mounting, but I'd skip the
> bolting of the angles to the channel -- since nothing is ever drilled
> perfect and something might be a tiny bit tweaked, I'd put together
> the frame mounting system, position the bumper (complete with channel
> affixed), and tack it all in place. Unbolt the assembly, and then
> weld up the channel/angle junction good and solid.
>
> Just some ideas - - Jon
>
>
> - Show quoted text -

First of all, I want to thank everyone for their design feedback. I'm
starting to move forward with a slight re-design based on the inputs.
I plan on taking some measurments sunday to get things a little more
accurate, plus to give me a better idea of what's feasable and what is
not. Here are the plans so far though.

1) Receiver Hitch Pin. I was planning on having the hitch pin
placement on the rear of the bumper. That is, if there is enough
clearance there. I'll figure that detail out once I get some
measurements. For now, the receiver hitch is more or less a
placeholder.

2) Safety chain hookups. Good catch by everyone, I'll be sure and
add these.

3) I'm going to change my design to use 3/16" thick steel instead of
1/4". I figure more give is a good thing, plus it's an overall weight
savings.

4) Shackle mounts I will plan on having go through the bumper and
attach to both the front and the back walls. Extra durability is a
plus, and also, good point about the welding and deformation.
Hopefully this will help out.

5) The crush sleeves are a good idea, I'll be sure and incorporate
that.

6) As for the frame connection/mounting. I'll have a better idea of
that after this weekend and taking some measurements.

7) Tow hooks, I'm not sure these are really necessary with the
shackles, seems like overkill to have both. Maybe I'm missing
something, let me know if I am.

8) Rear lights are a good idea. As for the best place to put them,
I'm not sure. Any suggestions are welcome.

----------
Tim J
Chassis - 1984 CJ7
Engine - SBC 305 http://www.4x4owners.com

Re: Rear Bumper Design Feedback
 

Looks almost like the one I am designing for my 2000 TJ. All I like is the
Mounting brackets myself.
Here is a link to what I have done.
http://7slotgrille.com/forum/topic.a...chTerms=bumper

As for the front bumper this is what I did for it.
http://7slotgrille.com/forum/topic.a...chTerms=bumper

Tom


"Tim J" <timothyljanssen@gmail.com> wrote in message
news:1173900349.860272.3200@n59g2000hsh.googlegrou ps.com...
> First off, I want to thank Roy and Jeff for sending me some pics of
> Air tank bumpers about a month ago.
>
> Now, I've finally started designing a set for my CJ7. I'm looking for
> people to give me feedback on it. Here is a general description. It
> will be made from 2"x5"x1/4" tube stock. The ends will be tapered for
> better approach angles. It will have an integrated 2 inch receiver
> hitch, and will be suppored by the frame and not just the rear cross
> member (with the help of some angle brackets). It will also have
> places for shackles. And it will be completely sealed so it can
> double as an air tank. The Tire carrier is what I am working on now,
> and the front bumper design will follow. I've rendered some pics from
> the CAD package I'm designing it in. They can be found here
>
> http://www.4x4owners.com/content/view/36/33/
>
> I'm open to all feedback, I don't want to start building and decide I
> should have thought of something else.
>
> Thanks in advance.
>
> ----------
> Tim J
> Chassis - 1984 CJ7
> Engine - SBC 305
> http://www.4x4owners.com
>

Re: Rear Bumper Design Feedback
 

Looks almost like the one I am designing for my 2000 TJ. All I like is the
Mounting brackets myself.
Here is a link to what I have done.
http://7slotgrille.com/forum/topic.a...chTerms=bumper

As for the front bumper this is what I did for it.
http://7slotgrille.com/forum/topic.a...chTerms=bumper

Tom


"Tim J" <timothyljanssen@gmail.com> wrote in message
news:1173900349.860272.3200@n59g2000hsh.googlegrou ps.com...
> First off, I want to thank Roy and Jeff for sending me some pics of
> Air tank bumpers about a month ago.
>
> Now, I've finally started designing a set for my CJ7. I'm looking for
> people to give me feedback on it. Here is a general description. It
> will be made from 2"x5"x1/4" tube stock. The ends will be tapered for
> better approach angles. It will have an integrated 2 inch receiver
> hitch, and will be suppored by the frame and not just the rear cross
> member (with the help of some angle brackets). It will also have
> places for shackles. And it will be completely sealed so it can
> double as an air tank. The Tire carrier is what I am working on now,
> and the front bumper design will follow. I've rendered some pics from
> the CAD package I'm designing it in. They can be found here
>
> http://www.4x4owners.com/content/view/36/33/
>
> I'm open to all feedback, I don't want to start building and decide I
> should have thought of something else.
>
> Thanks in advance.
>
> ----------
> Tim J
> Chassis - 1984 CJ7
> Engine - SBC 305
> http://www.4x4owners.com
>

Re: Rear Bumper Design Feedback
 

Looks almost like the one I am designing for my 2000 TJ. All I like is the
Mounting brackets myself.
Here is a link to what I have done.
http://7slotgrille.com/forum/topic.a...chTerms=bumper

As for the front bumper this is what I did for it.
http://7slotgrille.com/forum/topic.a...chTerms=bumper

Tom


"Tim J" <timothyljanssen@gmail.com> wrote in message
news:1173900349.860272.3200@n59g2000hsh.googlegrou ps.com...
> First off, I want to thank Roy and Jeff for sending me some pics of
> Air tank bumpers about a month ago.
>
> Now, I've finally started designing a set for my CJ7. I'm looking for
> people to give me feedback on it. Here is a general description. It
> will be made from 2"x5"x1/4" tube stock. The ends will be tapered for
> better approach angles. It will have an integrated 2 inch receiver
> hitch, and will be suppored by the frame and not just the rear cross
> member (with the help of some angle brackets). It will also have
> places for shackles. And it will be completely sealed so it can
> double as an air tank. The Tire carrier is what I am working on now,
> and the front bumper design will follow. I've rendered some pics from
> the CAD package I'm designing it in. They can be found here
>
> http://www.4x4owners.com/content/view/36/33/
>
> I'm open to all feedback, I don't want to start building and decide I
> should have thought of something else.
>
> Thanks in advance.
>
> ----------
> Tim J
> Chassis - 1984 CJ7
> Engine - SBC 305
> http://www.4x4owners.com
>