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Old 07-18-2013, 10:56 PM
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Camaro Zach Camaro Zach is offline
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Default Small press brake

I finally got the urge to build a press brake for my 20T Harbor Freight press after all the years of seeing them here.

The upper die is ~5/8" scrap plate hand ground to around 30* angle
Base is two pieces of 3/8"x6" flat bar
Lower die is two pieces of 1 1/4"x1/4" angle iron turned up 3/32" on each side (to bend past 90*)
Dual row valve springs for a return
And 5/8" bolts drilled/tapped into the base allow the upper die to slide up/down freely

When drilling/tapping the base I used 1-2-3 blocks to space it off the table. Is this pepper procedure? I am learning slowly how to use these tools properly.

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Old 07-19-2013, 08:29 AM
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Nice job that's gonna be handy for you, you will use it more and more all the time.
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Old 07-19-2013, 08:33 AM
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Cam, parallels, 1-2-3 blocks or even a pieces of seek the same thickness will do the job. Depends on the amount of accuracy needed.
One thing you might want to add to the upper die is a ring to keep the ram from slipping off of it.
Dan.
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Old 07-19-2013, 01:33 PM
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Quote:
Originally Posted by Lu47Dan View Post
Cam, parallels, 1-2-3 blocks or even a pieces of seek the same thickness will do the job. Depends on the amount of accuracy needed.
One thing you might want to add to the upper die is a ring to keep the ram from slipping off of it.
Dan.
That is in the plans, I just couldn't wait to test it out last night.

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Old 07-19-2013, 07:15 PM
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Did you put a space in between the to legs of the angle on the bottom die? I am going to make one of these myself soon as well, and would be apt for getting ideas.
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Old 07-20-2013, 11:53 AM
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Quote:
Originally Posted by weldor2005 View Post
Did you put a space in between the to legs of the angle on the bottom die? I am going to make one of these myself soon as well, and would be apt for getting ideas.
Ended up with about 1/8" of space on accident. Not sure if less or more would help any.

I bent a small piece of 1/4" plate just past 90* and it cracked. So maybe more gap on lower dies and a larger radius on the upper die to achieve a larger bend radius for thicker material.

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Old 07-20-2013, 12:15 PM
Steve60 Steve60 is offline
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nice! so you could easily make an extra die to hold fingers and have a box and pan brake too?
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Old 07-20-2013, 01:21 PM
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Nice job...Bob
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Old 07-20-2013, 02:25 PM
Shawn C Shawn C is offline
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around here so.ewhere i have a chart that tells you the required size for the bottom die as well as the force it will take to bend. if i can find it i will try to upload it for you
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Old 07-20-2013, 03:11 PM
aametalmaster aametalmaster is offline
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The biggest thing is the thicker the metal the wider the bottom die opening needs to be.

http://www.accurpress.com/toolingref_tonchart.html ...Bob
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