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Have you seen these?http://www.gottrikes.com/Tube_Bender.htm
This is right up your alley...http://www.dtsfab.com/index/index.php?topic=3673.msg62802#msg62802
l was also looking at the track motor on a 13 ton excavator that was in the yard today, if l mounted one of them in a sturdy bench/stand and had a way of dropping the dies onto it, hex shape drive ?, then l could just rotate the die with a simple lever valve, plan B then if this fails lol
ring roller
Baloo Here are a couple threads to another forum where you might see some ideas you might like to incorporate. OFN Bender area here at this linkhttp://www.offroadfabnet.com/forums/forumdisplay.php?f=95 This link below is more of bender stands and carts and it is in the link above somewhere too.http://www.offroadfabnet.com/forums/showthread.php?t=531&highlight=slowOne thing I HAVE to point out. If you read all those posts at the links above you will see more than a couple guys who build them like Cebby's have bender arm issues due to the angle the hydraulic cylinder is pushing on the moving arm. (There are some who have not. But many have)Its not applying the force as much to bend the tubing as it is to trying to shear the pivot pin. The Cylinders as the factory hydraulic setups push near perpendicular to the arms. While benders like Cebbies are almost parrellel to the arms.I have seen more than a few guys who have the pivot pin bind and gall and wear the pivot hole out quick. Others get the two mounting bolts that cannot hold the stationary arm solid due to the forces of the wrong angle and these move and cause uneven or non repeatable bends. Also using a tierod cylinder its not supported in the center and this causes the weight in the center to put a large load on the bender pivot again its not supposed to see and the rest or the load on the cylinders other end. This sagging cylinder causes other issues.There is a pretty neat soulution to this to where a guy used a type of ball bearing on a flat plate to support the weight.If its not in that other thread I linked it near there somewhere in those other threads.