The Rothenberger is driven by a rotary actuator. I would have suggested that, but he's trying to do it for less than $200 - $300. You can get rotary actuators for as little as $100, but I'm not sure they would have the necessary torque or rotation. Most that rotate 180 degrees and have the torque are $300 to $3000 used on eBay.clem said:Sonic your first design isn't that far off! When I was starting out in the offshore workplace I worked in the instrumentation field and we bent tubing all day long for process and stuff. I've bent from 1/8" stainless to 1" 2507 stainless steel and 2507 is stiffer then any seat hoop tubing that your going to bend. Back in 98 we had a hydraulic bender for the larger tubing that was similar to your sketch but the shoe was at the end of the ram on a pivot. The shoe was not fixed to the framework of the bender, instead fixed to the ram. It had a roller with a pin that went through both top and bottom plates and when you ran the hydraulic power pack it would drive the shoe and block up against the roller and it would bend the tubing. The shoe also had a hook at the front of it to secure the tube in place. We did a job that had 28,000 ft of 1" tubing to bend and had no problems with that design. Later on we switched to electric benders made by Rothenberger. These are very rugged and easy to use. They are about the size of a pipe threader. They are set up where the shoe is fixed and is gear driven. There is a hook on the front of it to secure the tubing and a roller pin to bind against the tubing. I don't have the sketch up skills to draw it out, so here is a link.
This is the Rothenberger. Ive bent some stout tubing with this with no problems.
http://www.rothenberger-usa.com/en/products/rothenberger/by-applications/bending-93/bender-electric-105/
drap a welding jacket or a towel over it and that chain won't go anywhere if it breaks I use to run a frame machine in a auto body shop and that all we ever did works great, if a clamp or a chain let loose. If some of you engineer type spent as much time using tools as you did talking about them and making cad drawings this thing would be built by nowSONIC. said:Party at my place, and junior volunteered to be the first to use the new bender! No chain guard of course because those are for pussies 8)
LOL. I am already too drunk to use tools.bradj said:If soom of you guys spent as much time using tools as you did talking about them and making cad drawings this thing would be built by now
This design is used all the time in forklifts. It will work great, the only thing to work-out is sprocket diameter to get you the range of motion that you want.SONIC. said:
xb33bsa said:you don't want those type of side pull/bending loads on the ram/cylinder the rod bushing will be to highly loaded as will the piston they are not designed for that type of load neither
deviant said:Check out this design: