Why is Pipe Twisting Machine Better?

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Nice video there, Karl! I looked for a used pipe threader at an affordable price for quite a while, they just don't pop up around here. People use them for their primary use and run them till they drop, then try to sell them for like $1K still... a Ridgid 300 is the best, and it would appear your machine is similar- with the quick chuck and the jaws right out front like that. Some other machines won't let you get in quite as close.
I saw a video on YT by Dionatam Franco, about power twisting, and noted that quite good results can be gotten by decreasing speed and increasing torque with a gearbox, driven by even a fairly small electric motor. You can use a separate motor and belt or chain drive a gearbox, or use a gearmotor outright. The body of the machine in general can be built very similar to a lathe.
So, I found a 1/2 hp gearmotor with (IIRC) 80:1 reduction from 1725 rpm, 3 phase so it's speed controllable with my VFD and fwd/reversible which is great for turkish twist and such, doing alternating twist directions. I set it up so the power runs last through a 3 phase foot switch (a largish knife switch put on the floor) so I can twist hands-free, and control things by being able to grab the billet while twisting or use water to slow twist in parts.
It works great, the largest bar it will hold is 1-1/8" square by about 28" long, and as Karl says the torque is amazing, even on that heavy bar the machine will "coast" a bit when you're done twisting and let off the switch.
You can see that the three jaw chuck is not good for either square stock or hot steel, so adaption is necessary if you use a threader. Karl's sockets are a good way, my machine uses a different type of holder- I'll post up some video here later today so you can see how that works, it's easier to describe by demonstration. I was able to put my twister together for basically no money other than welding rod and some grade 8 bolts, since I'm a scrounger... a good option if you can't find a threader.

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