Hi, I'm new to the "part moves while the tool stays still" method of machining. I have a "new to us" 1994 Puma 6s lathe with a 8" three jaw hydralic chuck. I need to hold a variety of sizes (.250" - .870") of square stock. I think a two jaw will treat me right. What kind do I need? Are all hydraulics the same if it fits the spindle? Can I put a manual key chuck on if I can't get a hydraulic? All advise is appreciated.

Thank you,

Frank

Frank,

Welcome to "as your world turns".

1. What is the serial number of your machine?

2. What make & model # is the 8" 3-jaw on the machine now?

Many chuck manufacturers make a 2-jaw hydraulic chuck. The trick will be to see if you can get one with the same draw-tube thread.

How about a collet-chuck for the square stock?

Dave

How about a set of those top jaws (for your 3 jaw) that hold W&S collet pads? We got ours from US Shop Tools - they sell the pads as well.

They work fine for us for the infrequent times we have to run square stock.

They are also good for running small diameter round stock in a big through hole chuck, where you would otherwise have to make up some really 'pointy' top jaws.

We don't do enough of the small diameter work to justify a 'real' collet setup, and even if we did, the changeover time for the collet pad jaws is hard to beat.

I use a 3J collet chuck on my puma 6 it works great you can get emergency collets and make them what ever shap you want, but i have also just milled jaws for a 3 jaw chuck to hold square parts

Thanks for the welcome.

The machine S/N is PM6S-0335, the chuck is an 8" Kitagawa B-208 with 1958 also marked on it. I found a few two jaw chucks but don't know what fits. Do I have to use a hydraulic? What is the size or style of the spindle?

I just looked at the W&S jaws. From what I see, I don't think they will work out for me. I think cutting a V knotch in the jaws of a two jaw will work. The stock is actually a wall of tubing. If the tubing wall is .500 thick, then I cut a .500 wide strip out and need to turn a .500 x .500 "kind of square" piece round.

Are these chucks mounted to an adapter? I found one chuck that would work and it is for an "A2-6" spindle. What is a Puma 6s spindle?

Are these chucks mounted to an adapter? I found one chuck that would work and it is for an "A2-6" spindle. What is a Puma 6s spindle?

it depends on the machine use the numbers off the chuck that is currenty on it and call the company that has it, i use ats chucking systems on my newer machins with S-20 collet pads and they seem to work very well and my guys seem to like the ease of changing out pads,

Do you have any of the machine manuals? I looked on the Daewoo site and I couldn't find anything that old. Where are you located? Perhaps you could contact Daewoo (973-618-2500) and get information about the spindle nose/drawtube thread.

No, no manuals. It is a one piece chuck, no adapters. I called Daewoo, nice people by the way, it is whats called an "A2-5" spindle nose. They did not have the draw tube info handy. They said when I order a chuck, the manufacturer will make the correct adapter. That's it. I would like to buy a used chuck since this machine will only be used 2 hours per month. Plus, holding on rough stock, accuracy is not an issue. At least I know more of what I have and need. Thanks all for your input.

Frank