Welding Positioner

jbolt

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I blame RayC for planting the seed in my head to build a positioner. See his post https://www.hobby-machinist.com/threads/welding-rotary-table.64640/

I have another project that has a lot of round bits to weld so it made sense to make one. This is my slightly more complicated re-mix of Rays concept.


The table is 6" x .5" steel. Slots are sized for a 1/4" nut across the flats. No need to make special nuts. Slots were machined on the CNC mill. I had to get creative on holding a 6" disc in a 4" vise.

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Main shaft, bearing block, taper roller bearing and retainer/ground commutator.

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Main shaft is pressed into the table. No welds.

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The base is made from 11 ga. steel sheet. I had my local supplier cut them to size for me. Cost me $13 out the door. 12v power supply and speed control are mounted to 1" x 1/8" flat and then to threaded stand-offs welded to the underside of the base top. There is a anti-rotation bracket attached to the motor gearbox with a slot that engages a 1/4" dowel pin which is pressed into the bearing block. A set screw secures the gearbox shaft to the main shaft. The motor/gearbox are only supported by the shaft.

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The stand is made from 1" square tube and 3/8" x 2" steel flat. The table can be set from 0 - 90 degrees in 15 degree increments.

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Adapter for a 5" 3-jaw chuck

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Painted, wired up and ready to go. I did the table ground a little different than RayC. I used 3 strands of 1/4" copper ground strap which wraps around the shaft retainer and is tensioned with a spring. There is a ground lug for the welder ground clamp on the bottom strip that holds the power cable gland and the 2-pin foot switch connector. I also added an adjustable hand support system.

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Ray C

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Man, I wish I had one like that!

Very nice!
 

RandyM

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:cheer::cheer::cheer:

Very professional.
 

brino

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Fantastic Build!

Thanks for sharing this.
-brino
 

Downunder Bob

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Very nice, I know my circular welds would be neater if I had one, but at this stage I can't justify the time.
 

FOMOGO

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Great job, will be a real asset in the shop. Mike
 

matzo

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The ground stop goes from where nowhere?
 

matzo

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Sorry from where to where?
 

Chewy

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Excellent! Have put it on to-do list. I have wanted something like that for years.
 

GunsOfNavarone

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I think some one else asked it... @jbolt how do you mitigate the juice traveling to ground from the welder? I have all the parts to build one, but I'm afraid the amps from the TIG will blow something.
 

jbolt

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The welder ground is connected directly to the ground lug on the positioner housing. The ground strap inside makes a direct connection from the turntable shaft to the housing. This also keeps full current from traveling through the roller bearings and damaging them. The chassis of the speed controller and power supply are grounded to the housing through the mounting screws. The electronics are unaffected by the welder.
 
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