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Repurposed old Troyke rotary table as welding positioner

mrplasma

Aluminum
Joined
Sep 25, 2020
I couldn't find any buyers for my old 9" Troyke rotary table, so I combined it with some drill press parts to make a welding positioner. As pictured the table has a speed range of around .5 rpm to 5 rpm, and the range can be changed via timing pulley changes. I am adding a 12" diameter face plate with 1" standoffs.

I have a grounding plan in mind, but there is another issue. The cheap Chinese variable speed gear motor I used works great, but its capacitor doesn't like it when you switch it on at a pre-determined speed setting. When I use a a foot pedal to turn it on the capacitor freezes up. I suspect that a U.S. made motor.controller without that shortcoming would probably cost twice as much as the rest of the project.
 

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dana gear

Hot Rolled
Joined
Feb 27, 2013
Location
Northern califorina, usa
We have a couple of in house built weld poitioners that have old lathe face plates on them.
We put a couple old Lincoln SA 200 engine drive spring loaded brushes (the ones used on the commentator) on the outside face of the face plate and pig tailed them to a point of work connection. been there for years work great.
 

mrplasma

Aluminum
Joined
Sep 25, 2020
I came up with a method of grounding the unit -- a spring loaded brass rod rides against the edge of the table top. The ground can either be clamped or bolted to the mounting bracket. The ground bracket uses nylon bolts and flat washers to insulate it.

w vise 750kb.jpg 90 degrees 800kb.jpg
 
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Rob F.

Diamond
Joined
Aug 5, 2012
Location
California, Central Coast
I came up with a method of grounding the unit -- a spring loaded brass rod rides against the edge of the table top. The ground can either be clamped or bolted to the mounting bracket. The ground bracket uses nylon bolts and flat washers to insulate it.
You might consider not isolating that grounding brush from the rest of it. The ground should go through the path of least resistance which is the ground brush. In you case if the ground comes off your bracket and is laying on the table all the current will go through the rotating bearings. Or if you get sidetracked setting it up and forget the ground.
The entire thing should be grounded with the brush, all you need to do to use it is set in on a grounded welding table and start welding. Bearings etc will be fine if the brush is working.
 

mrplasma

Aluminum
Joined
Sep 25, 2020
Three clamping shaft collars and some scrap steel bar make a sturdy fully adjustable hand rest. It can also accommodate a Tweco torch holder.

hand rest.jpg finished positioner2.jpg
 








 
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