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Old 03-30-2018, 10:40 AM
Scratch Scratch is offline
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Default Blacksmith Bending Jig

I've been wanting something like one of these blacksmith bending jigs for a long time now.
Here's a good video showing how they're used:
http://www.youtube.com/watch?v=hY1d3RJ0TeM&t=328s
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Old 03-30-2018, 10:41 AM
Scratch Scratch is offline
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But they want more than I'm willing to pay so I decided I'm going to build one myself since I have some 1" steel laying around and a CNC plasma cutting table. But I think I'm going to make some changes and I'm here looking for advice.
I like the square design, but I don't see the need for a spiral hole layout... I was thinking about a 1/2" hole in the center, then a series of more 1/2" holes spaced every 1" center to center, but having each series of holes at different distances from the center hole, in 1/4" increments. The first series would be 1/4" away, the next 1/2" away, then 3/4" and finally 1" away from the center hole.

I was initially thinking about having a series of holes along the edge at different distances also, just like the one in the video, but then I thought I really didn't need them since all the other holes do the exact same thing. You can see the layout on the far right has those holes removed. The yellow blocks show the widths for bending steel.
something like this:
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Last edited by Scratch; 03-30-2018 at 10:50 AM.
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Old 03-30-2018, 10:41 AM
Scratch Scratch is offline
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I'll use 1/2" drill bits with the flutes cut off, as my pins for bending and locating the round jig discs. I'll add a thinner, square piece of steel underneath to stop the pins from falling through. I'll add a 1" piece of steel underneath to set in the hardy hole, and in the square hole on my fab table.
Here's an image with the 8" disc on there showing some different thicknesses of steel in it for bending.
Any other suggestions?
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Old 03-30-2018, 01:28 PM
Farmersamm Farmersamm is offline
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That looks very doable. I'm not a metal bender, but it looks like it makes sense.
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Old 04-01-2018, 09:15 AM
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I believe the spiral hole layout is for bending scrolls, where the radius needs to increase as the bend progresses. If you are only wanting to make corners and circles your X layout should work just fine.
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Old 04-01-2018, 11:16 AM
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Quote:
Originally Posted by Matt Shade View Post
I believe the spiral hole layout is for bending scrolls, where the radius needs to increase as the bend progresses. If you are only wanting to make corners and circles your X layout should work just fine.
If you've seen someone using these for scrolls let me know.

Ive watched a bunch of videos with people using these and haven't seen anyone using the spiral holes for scrolls. I think the spiral pattern is to get smaller increments away from the center.
Like with my idea, using all 4 series of holes, I can get increments as small as only 1/4". I think by using a spiral pattern, they might be able to get increments of as small as 1/8" maybe...?
I'm panning on just adding a sleeve over the pin if I need to get a smaller increment.
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Old 04-02-2018, 10:23 AM
Farmersamm Farmersamm is offline
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I'm dyslexic, did you say increment, or excrement?



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Old 04-02-2018, 07:47 PM
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Quote:
Originally Posted by Farmersamm View Post
I'm dyslexic, did you say increment, or excrement?



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Speaking of which did you know that the only difference between affluent and effluent is one vowel?
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Old 04-02-2018, 11:15 PM
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Or one chili relleno
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Old 04-06-2018, 09:29 AM
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Quote:
Originally Posted by Scratch View Post
B
I like the square design, but I don't see the need for a spiral hole layout... I
something like this:
The spiral is for compound bends or scrolls, I think. For bending scrolls up to 18" wide, I have the instructions saved, because the only way I know other than your spiral is to create a spiral with bolts on a large plate, and use the math to calculate it out.
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