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Old 11-05-2018, 08:13 PM
flyonly flyonly is offline
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Default Rolling Aluminium Angle

Hi

I am trying to build a chain guard out of some unequal aluminium angle. 25mmx 12mm with a 3mm thickness.

I would just like to follow the curve of the rear sprocket which is about 150mm diameter.

I can anneal it to start with but I am thinking its going to want to crip up.

Any ideas or suggestions please or recommendations of someone who might be able to help me in the Brisbane area of Australia?
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Old 11-06-2018, 01:14 AM
norson norson is offline
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Shrinker with no-mar dies.
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Old 11-06-2018, 05:13 AM
Oldnek Oldnek is offline
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Shrinker with sandpaper.
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Old 11-06-2018, 11:08 AM
toreadorxlt toreadorxlt is offline
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Thats nearly .125" thick. I dont think an average kick shrinker will do it.
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Old 11-06-2018, 11:15 AM
fciron fciron is offline
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You could make a bending form (metal is great, plywood will work) and pull the angle around it, stop and hammer down the kinks as you go. You can hammer out the kinks directly on a steel form, but you'll need to move to an anvil of some sort of it's a wood form. You might need to anneal more than once and you'll probably need to do a little clean up on the inside edge of the curve with a file.

If you have access to actual rolls I just learned a trick where you put one leg of the angle between the roll and the frame to create flanged rings. Should work for your curve too.
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Last edited by fciron; 11-06-2018 at 11:17 AM.
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Old 11-06-2018, 11:53 AM
norson norson is offline
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I'd still try the shrinker and the sand paper is a good Idea.
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Old 11-07-2018, 06:13 AM
billfunk29 billfunk29 is offline
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Default 1/8" shrink

I have bent 1/8"x 1.5x1.5 (6063)on a hand shrinker. Big radius though. I had to modify the jaws to get them to open up enough. I did it cold, but I think a little heat might make it work on a tight radius.
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Old 11-07-2018, 12:18 PM
crystallographic crystallographic is offline
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I've worked extruded angle, (6061 T6) of about that dimension, a few times.
When using a small (good) handshrinker, I heat the flange and shove it with the shrinker, pull it out and sprinkle the shrink jaws with water right away - to cool them immediately.
Then I repeat until I have the requisite curve.


I've also made up a plywood sandwich with curved edges to hold the flange tightly, heated and then shoved the sandwich in a press. I re-cut the curves after each success to increase the curvature of the next bend until I have the required curvature.

- A little wood smoke adds to the shop ambiance.
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Last edited by crystallographic; 11-07-2018 at 12:22 PM.
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