Diy Bending...
#21
Re: Diy Bending...
Originally Posted by Joseph Davis
I've watched a two stroke guy fix a dented exhaust by capping one end, pressurizing the other with shop air, and geeeeeeeently heating the dented area. I think you could manage to uncrush some crush bent by this method.
#22
Re: Diy Bending...
Yeah- that's where I've been headed- "Ok then, can I build a mandrel bender?".
I have been looking at taking a similar approach to what guys do building regular benders- buy some tooling, build the rest.
So basically pick a rotary draw machine with a design that lends itself well to adding a mandrel- no huge deal I don't think.
The mandrel is easy enough- but the wiper die is a pretty sophisticated piece.
I will probably build it with the thought that I may need to retrofit a wiper die, but just try a mandrel at first.
Some mandrel benders "boost" the material around the die, things can get complicated fast, but my thought is that if a guy just built a more deluxe version of a standard bender and kept evolving it, he might be ale to get something decent.
I am thinking I will likely go to 14 gauge (0.083") material for the headers as a nice compromise between 16 gauge and schedule 10- one benefit is that it should be slightly more forgiving when bending.If I can come up with a way to bend 1-5/8" x 0.083" stainless on even a 3" radius (6" between the legs on a u-bend) I will be in great shape.
I am thinking about basing it on this bender:
http://www.mittlerbros.com/tube_bend..._hydraulic.htm
They have extremely detailed assembly drawings for it on their site, along with parts lists.
I'd likely buy the gear/rack assembly and maybe the shaft from them, and a 1-5/8" die set. Then I'd have a smaller radius 1-5/8" bend die made (my brother is a machinist, yay!) and set up a mandrel.
It's basically just a 4'x4' welding table with a 3/4" thick steel top with drilled tapped holes for the tooling, bracketry for the hydraulic cylinder below, and that's it.
Famous last words...
I have been looking at taking a similar approach to what guys do building regular benders- buy some tooling, build the rest.
So basically pick a rotary draw machine with a design that lends itself well to adding a mandrel- no huge deal I don't think.
The mandrel is easy enough- but the wiper die is a pretty sophisticated piece.
I will probably build it with the thought that I may need to retrofit a wiper die, but just try a mandrel at first.
Some mandrel benders "boost" the material around the die, things can get complicated fast, but my thought is that if a guy just built a more deluxe version of a standard bender and kept evolving it, he might be ale to get something decent.
I am thinking I will likely go to 14 gauge (0.083") material for the headers as a nice compromise between 16 gauge and schedule 10- one benefit is that it should be slightly more forgiving when bending.If I can come up with a way to bend 1-5/8" x 0.083" stainless on even a 3" radius (6" between the legs on a u-bend) I will be in great shape.
I am thinking about basing it on this bender:
http://www.mittlerbros.com/tube_bend..._hydraulic.htm
They have extremely detailed assembly drawings for it on their site, along with parts lists.
I'd likely buy the gear/rack assembly and maybe the shaft from them, and a 1-5/8" die set. Then I'd have a smaller radius 1-5/8" bend die made (my brother is a machinist, yay!) and set up a mandrel.
It's basically just a 4'x4' welding table with a 3/4" thick steel top with drilled tapped holes for the tooling, bracketry for the hydraulic cylinder below, and that's it.
Famous last words...
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jockobo
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11-21-2003 07:04 AM