Anybody Ever Make a Postioner?

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Just curious if anybody has ever made a positioner from things found around the shop?  I would like to make one, and have a pretty good idea how, just have to find a big chuck.My Babies:MillerMatic 185Thermal Arc 300SHobart StickMate AC/DC 235/160Dalex Werke Spot WelderOh and the wife and kids are important too!
Reply:tread mill maybe?
Reply:gjgarreHow big a chuck you lookin for?A butterfly without wings, is just an ugly bug
Reply:Granger would be a good start.  I have used them before.  JGSMAW,GMAW,FCAW,GTAW,SAW,PAC/PAW/OFCand Shielding Gases.  There all here. :
Reply:Here's a dumb question on a postioner; how does that current pass from electrode thru material and back to ground w/o damaging the motor or bearings?
Reply:Originally Posted by GLwelderHere's a dumb question on a postioner; how does that current pass from electrode thru material and back to ground w/o damaging the motor or bearings?
Reply:Originally Posted by TensaitekiDavid R made a thread about one of his positioners that has some good pictures of the braided copper strap used to transfer the welding current between the rotating positioner shaft and the table/welding machine. Click here for thread.
Reply:Brainfarth did one that I thought was quite unique!City of L.A. Structural; Manual & Semi-Automatic;"Surely there is a mine for silver, and a place where gold is refined. Iron is taken from the earth, and copper is smelted from ore."Job 28:1,2Lincoln, Miller, Victor & ISV BibleDanny
Reply:I've been planning on making one for some time now...I'm gonna use a spindle from a lathe prolly a d1-6 just for the easy of interchangeability. The ground i have not figured out as yet or the age old argument of bearings or bushings. One of these days ill find all the parts i need..
Reply:I've always thought that a Truck spindle and hub would make a good platform for building a positioner.Finding a chuck is in fact the hard part. Though you could probably fabricate a three or four jaw chuck with little difficulty as your runout need not be held to thousandths or even hundredths really.
Reply:Not a positioner, but my welding table rotates. It's built around pretty nice spindle with some high quality bearings. The top surface is attached with a 1" bolt into the spindle, and a 1" thick by 2" diameter brass bushing between the spindle and top. I haven't had any problems whatsoever, It turns as smooth as silk. I posted a thread a year or so ago after I built it if you want to search my threads.Miller EconotigCutmaster 38Yes ma'am, that IS a screwdriver in my pocket!
Reply:We used bushings on our welding positioners to avoid arcs in the bearings. Used 8" lathe chuck mounted to 3" DOM so that there is a through hole in the positioner. Isolated the electronics and motor from the frame with nylon sprocket on the chain drive and pvc mounting blocks for the motor and power supply/switches. Originally used 1" x 1/8" solid copper strap, but got a lot of chattering on the DOM tube that it was mounted to. Switched to braided strap with much better results. I am new to this forum and we are selling these positioners, so I don't think it is appropriate to post pics or info, but maybe this info will help.