Welding positioner

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I have a 4 jaw lathe chuck that I got for a song and would like to build a welding positioner with it. The chuck is 16in in dia and has a 4 1/2 in bore. I was was wondering if there is enough advantage having a hollow spindle to justify the cost of the bearings to support it. Or is there an alternative that is more affordable ? Or should I just use a piece of 2" solid shafting.the backside.With a piece of 5in pipe ( just for perspective).brad
Reply:In all reality you need a 3 jaw chuck for a positioner AND.....You will need onehellofa motor just to spin that!Unless you really need a "Industrial" size positioner I would look for something around 6" and start from there.Just what do you need something that huge for?...zap!I am not completely insane..Some parts are missing Professional Driver on a closed course....Do not attempt.Just because I'm a  dumbass don't mean that you can be too.So DON'T try any of this **** l do at home.
Reply:Large bearings for a positioner are not really necessary. You could use 6 small bearings. spaced at three points around a machined piece of pipe attached to your chuck. since it will never turn very fast they can be old bearings from a used motor. A centerless positioner although not rare is a joy to use if you need it.   Being able to clamp an off center Item may come in handy also. I would go for it.   Mac
Reply:the 4 jaw is going to come in handy on off center parts my positioner has a 2 1/4 inch thru hole but i also weld alot of Convoluted hoses so its neededi posted a thread on the how it was supported bearing wise awile agoMiller Xmt 350Lincoln Ln-25Ahp 200xSmith Gas Mixer AR/HTig is my Kung FuThrowing down dimes and weaving aboutInstagram http://instagram.com/[email protected]
Reply:It's similar to what you want.... yet different in every way. I wouldnt use it.Welding/Fab Pics: www.UtahWeld.com
Reply:Those exposed threads are gonna cause you problems unless you only TIG.My name's not Jim....