My son did the siding on my house and to expedite the job I bought a siding brake off of Craigs list for $300. Now that the job is done, rather than reselling it, I was thinking it would make a good brake for my project. Anyone else use one of these?   

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I have never tried using a siding brake for aircraft part forming but have wondered the same thing. My "gut feeling" is that it would work only for parts made of fairly light gage sheet aluminum, siding metal is pretty thin stuff. Perhaps you should experiment with a few pieces of scrap of various gages and see how it does. Be sure to make sure it makes an acceptable bend radius, too -- a piece of siding that snaps because the bend radius is too tight does not cause the house to crash, a piece of airplane that breaks because of too tight a bend can lead to disaster.

I have used a siding (flashing) brake to bend some parts and it works on lighter aluminum, depending on the brake, I was bending .35 not easy but doable. The radius is a bit sharp but you could use a shoe or some other device on the clamp part, what I did was be very careful and not bend it fast and move it slightly outward 1/2 way through the bend to get the radius I wanted. It is not a high production thing but I found it could be done.

My plan was to modify or make a new clamp shoe with the proper radius. I'm a machinist so it wouldn't be a big deal. It helps that the owner of the shop I work in was a home builder too. 

Great solution...

You make me wish that I still had access to a Bridgeport or CNC mill, lol.

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