36" Shop Press/Press Brake - JeepForum.com
 
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post #1 of 7 Old 01-18-2012, 07:31 PM Thread Starter
1995Moneypit
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36" Shop Press/Press Brake

Winter is dragging up here in Michigan and my ADHD is really kicking in. Thinking of some new projects and expanding my home shop capabilities and was considering building a shop press. I've looked at the HF one and some of the nicer presses at a local machinery supplier and the basic structure seems pretty simple. In the early stages of designing it and wanted some opinions to see if I'm going the right direction with this.

I would like to be able to bend up to 3' length of 3/16" stock for bumper fabrication. Looks like 20-ton units can bend up to 15", so originally I thought about constructing one with (2) 20-ton bottle jacks with a lever assembly to connect the two pump handles. I'm concerned that one might "age" differently than the other and end up with uneven pressure accross the press. Now, I'm thinking of just going with (1) 50-ton bottle jack.

Any thoughts or experiences with building something like this? Is the 50-ton going to be enough to put some decent bends in 3/16 to 1/4" material @ 36" long?

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post #2 of 7 Old 01-18-2012, 10:06 PM
97xjsam
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Im no engineer but I use a 40ton press for bending and breaking weld test specimens that are up to. 500wall and it works great....the only problem I can see is being able to evenly apply pressure on a 3' long piece of material so it bends correctly
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post #3 of 7 Old 01-19-2012, 05:43 AM
BESRK
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With a 1.5" bottom "V" die, you'll need about 11.2 tons per linear foot to bend 3/16". You should have no problem doing 3ft of 3/16" if set up properly.

'80 CJ5 w/AMC360, T176, D44 w/Detroit 4.56, RE 4" YJ lift and 35s..



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post #4 of 7 Old 01-19-2012, 05:43 PM Thread Starter
1995Moneypit
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Quote:
Originally Posted by BESRK View Post
With a 1.5" bottom "V" die, you'll need about 11.2 tons per linear foot to bend 3/16". You should have no problem doing 3ft of 3/16" if set up properly.
Thanks. I was hoping someone had a formula like that. The presses I've seen have a solid rod at the center for the press point. What about installing additional contact points to help distribute the weight across the brake jig.

Not sure if I can mention a different forum, but I think I saw a post on another 4 x 4 forum that showcased a 48" press brake you fabbed up. That one looked great!
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post #5 of 7 Old 01-19-2012, 08:51 PM
webdog
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Here is a link to the one I made with the Swag Offroad 37" die and 2 20ton bottle jacks.

http://www.jeepforum.com/forum/f37/d...brake-1284963/
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post #6 of 7 Old 01-20-2012, 05:54 AM
BESRK
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Here's a useful table for calculating tonnage requirements...

Tonnage Requirements

'80 CJ5 w/AMC360, T176, D44 w/Detroit 4.56, RE 4" YJ lift and 35s..



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post #7 of 7 Old 01-20-2012, 02:12 PM Thread Starter
1995Moneypit
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Quote:
Originally Posted by BESRK View Post
Here's a useful table for calculating tonnage requirements...

Tonnage Requirements
Thanks for the link. That will be very helpful. Also, it looks like an assortment of dies is needed to bend the different thicknesses.
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