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  #1  
Old October 19th, 2004, 17:37
XJ618 XJ618 is offline
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Fabrication

ok i am completely new at fabrication, im talking no idea, i think its pretty nuts though and the search just isnt specific enough. so help me out. i know people use metal that is 3/8"? i think, for a good durability/weight ratio, and i know everything is welded together. my question is what do you use for the actual face of say a bumper? im guessing some sort of thick steel sheet, but what do you use to bend it, or do you cut the specific peices and weld all 90* angles?? does anyone have any plans (like from acad) they could post just to see how you would draw up something like this? I know a lot of you are really into ths so i would appreciate any advice or words of wisdom i can get. thanks
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  #2  
Old October 19th, 2004, 17:44
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Redcbr007 Redcbr007 is offline
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Re: Fabrication

most people use 3/16 - 1/4

i only use 3/8 for key items that need a whole lot of strength....ie: wristed arms
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  #3  
Old October 19th, 2004, 17:45
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TrailHunter TrailHunter is offline
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Re: Fabrication

3/8" steel would be extremely heavy for a bumper. 1/4" would be indestructable still and 50% lighter. I like to use 1/4" where I might actually hit the bumper on a ruglar basis and then just somthing lighter like 3/16" for the rest of the bumper. I personally don't want 100 lbs of steel hanging off the end of my XJ. It's always a balance. Many bumpers out there like TrailReady's bumper only uses 1/8" and they say it's "bullet proof". I wouldn't go any lighter than 3/16 and 1/4 being truely bullet proof.
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  #4  
Old October 19th, 2004, 18:59
RCP Phx RCP Phx is offline
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Re: Fabrication

Strength comes from form more than material thickness!Mines got everything from .120" wall to 3/8".It took a week to form fit the radius of the front grill!
Front Bumper Pics
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  #5  
Old October 19th, 2004, 19:02
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BrettM BrettM is offline
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Re: Fabrication

Quote:
Originally Posted by XJ618
ok i am completely new at fabrication, im talking no idea, i think its pretty nuts though and the search just isnt specific enough. so help me out. i know people use metal that is 3/8"? i think, for a good durability/weight ratio, and i know everything is welded together. my question is what do you use for the actual face of say a bumper? im guessing some sort of thick steel sheet, but what do you use to bend it, or do you cut the specific peices and weld all 90* angles?? does anyone have any plans (like from acad) they could post just to see how you would draw up something like this? I know a lot of you are really into ths so i would appreciate any advice or words of wisdom i can get. thanks
box tubing and angle are your friends to avoid too much welding
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  #6  
Old October 19th, 2004, 20:01
Beezil Beezil is offline
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Re: Fabrication

Quote:
Originally Posted by Eric@OA
3/8" steel would be extremely heavy for a bumper. 1/4" would be indestructable still and 50% lighter.
it would only be 33% lighter.


I suggest 1/4" for the frame tabs, 1/4 or 3/16 for the winch box, and 8 ga. for the "skin"

geometry will determine what material thickness is needed.

a .120 strip of steel, bent in a hat section is more rigid than an unformed strip of .250 with the same outer dimensions.
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  #7  
Old October 19th, 2004, 20:10
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OT OT is offline
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Re: Fabrication

Quote:
Originally Posted by Beezil
it would only be 33% lighter.


I suggest 1/4" for the frame tabs, 1/4 or 3/16 for the winch box, and 8 ga. for the "skin"

geometry will determine what material thickness is needed.

a .120 strip of steel, bent in a hat section is more rigid than an unformed strip of .250 with the same outer dimensions.
33.3333333% lighter
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  #8  
Old October 19th, 2004, 20:11
C-ROK C-ROK is offline
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Re: Fabrication

Quote:
Originally Posted by Beezil
it would only be 33% lighter.
But 3/8" is 50% heavier than 1/4"?
How can 1/4" only be 33% lighter than 3/8"?

Is this non-linear math?






kidding....., ok?

I agree with Beez, mostly. My old bumper was .125" skin over 1/8" square tube with a 1/4" wall angle at the lower "leading" edge. It held up to everything but a failed attempt at a 5200lb backflip.
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  #9  
Old October 19th, 2004, 20:12
Beezil Beezil is offline
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Re: Fabrication

Quote:
Originally Posted by Okie Terry
33.3333333% lighter
thanks.

which one of you guys thought it was important to clarify?

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  #10  
Old October 19th, 2004, 20:51
Lincoln Lincoln is offline
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Re: Fabrication

Quote:
Originally Posted by Beezil
thanks.

which one of you guys thought it was important to clarify?

The dude in the middle? He looks more like a claifier.
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  #11  
Old October 20th, 2004, 05:48
C-ROK C-ROK is offline
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Re: Fabrication

Quote:
Originally Posted by Lincoln
The dude in the middle? He looks more like a claifier.
Ya. That's me in the glasses.

Damn them cool lellow tinted shades.
Chicks in the chess club dug those.
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  #12  
Old October 20th, 2004, 07:43
Lawn Cher''s Avatar
Lawn Cher' Lawn Cher' is offline
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Re: Fabrication

Quote:
Originally Posted by XJ618
ok i am completely new at fabrication, im talking no idea, i think its pretty nuts though and the search just isnt specific enough. so help me out. i know people use metal that is 3/8"? i think, for a good durability/weight ratio, and i know everything is welded together. my question is what do you use for the actual face of say a bumper? im guessing some sort of thick steel sheet, but what do you use to bend it, or do you cut the specific peices and weld all 90* angles?? does anyone have any plans (like from acad) they could post just to see how you would draw up something like this? I know a lot of you are really into ths so i would appreciate any advice or words of wisdom i can get. thanks
You should go find a local steel supplier and see if you can wander around in their warehouse, getting an idea of the various shapes and thicknesses available. Nothing like firsthand visual aids to clear up your questions.
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  #13  
Old October 20th, 2004, 17:20
Lincoln Lincoln is offline
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Re: Fabrication

Quote:
Originally Posted by C-ROK
Ya. That's me in the glasses.

Damn them cool lellow tinted shades.
Chicks in the chess club dug those.
Think whatever makes you feel good.
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  #14  
Old October 20th, 2004, 18:00
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Re: Fabrication

Quote:
Originally Posted by Lincoln
Think whatever makes you feel good.
Well, you know a thread has served it's usefulness when Linc posts on it.

Stick a fork in this, it's done.
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  #15  
Old October 20th, 2004, 20:10
Lincoln Lincoln is offline
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Re: Fabrication

Quote:
Originally Posted by Okie Terry
Well, you know a thread has served it's usefulness when Linc posts on it.

Stick a fork in this, it's done.
I've posted on it several times.
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