This is my Franken-cobbled motorized weld positioning table! It's made from a Harbor Freight trailer hand winch and 12 volt worm drive motor. (a wiper motor can also be used)
The winch itself is NOT very useful as a winch (lol) as this has about a 40:1 ratio. You would spend most of the afternoon winching your car or boat up using this. Also, both gears are not hardened so using them to pull a heavy load would wear them out quickly! (has terrible reviews)
It is however a GREAT starting place to build a rotary weld positioner! Just cannibalize the needed parts; worm drive, drive gear and housing and your well on your way. There are many parts left over (bonus) that can be used for future projects. (see pics)
This version features both horizontal and vertical positions. I was not going for beauty but rather function and I think I nailed it! lol Probably won't even paint this, just use it as is. (and make improvements as needed)
I've run this from an adjustable power supply from 2 volts up to 30! You won't be welding anything at 30 volts but down around 3-3.2 volts looks about right. (have to time it yet, I heard 1/8" per second is about correct for Tig welding)
If you want fancy, this one is not for you but if you want a cheap & functioning positioner, this fits the bill!
I will need either a foot pedal or some other way of starting/stopping but so far, I haven't had time to even test it yet! lol
It's called a "slack adjuster" and is some type of brake adjuster for a big rig truck. This might work better for a rotisserie. I got this idea from someone on youtube that put one on an engine stand so he could easily/safely rotate the engine!
I bought one for a project I'm planning that is still in the planning stages but that's top secret yet! lol
Last edited by bobs409; 01-07-2020 at 06:05 AM.
Yes, bob slack-adjusters are a good source for a worm drive. I have been looking on Craig's list locally for a couple of years but no joy. They are brake adjusters and when they reach their safety limits they are just thrown away. They had no value and were usually tossed in the dumpster. I don't know what has happened but I can't find "free" ones anywhere!
Many thanks for the good ideas and the link!
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