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Hi, and welcome to the group. 3-jaw chucks vary in runout, but should not be as bad as you describe unless something is wrong. Like poorly fitted backplate. But you mentioned centering the workpiece.

Hi Dan, It may well be the jaws are not in the correct positions. There are numbers stamped on the jaws and on the body, maybe check? Cheers, James, Locked down in Dunfermline, Fife, UK

Hi A couple of things. Are the jaws in the correct slots, they are numbered. Do the jaws have any sign of wear. Could you show us some photos of the chuck so we can get a better idea.

Hi there I've just gotten myself an old unimat selecta mini-lathe, with the standard 3 jaw chuck installed. I seem to be having quite a bit of trouble 1. getting things centred and 2. getting the jaws

I’m a relative beginner but I would say as long as the chuck is correctly fitted, tight is good. The 3 jaw chuck that came with mine secondhand moved freely and I had difficulty getting the

My original 3 jaw is still very tight to move by hand, I’ve oiled all the parts and the jaws themself and it’s only reduced a little, honestly I don’t have issues holding material I only get

G'Day Matthew! Try the chuck ways for fit with chuck disassembled before lapping and if it is the same, try lubricating and if that helps, use chuck as it is, it may work its way by itself after a

Lapping should be a last resort imo. I've ruined a chuck in the past trying to true up the jaws. I would imagine your problem is elsewhere, I doubt it would have left the factory all those years ago

My jaws are very tight. ?I will have to lap each one of the a little bit. ?Equal amounts off of both sides.

I use a very light grease sparingly. The canned spray on type you might use for a bicycle. Swarf and chips getting into it are inevitable im affraid.

1. The jaws should be a snug fit/ they should slide fairly easily but they should not rattle in the guides/ ideally there should be no slack at all. 2. I would avoid all oils, since they are going to

Good evening friends, I have recently disassembled and cleaned my new to me 3-jaw chuck for my DB/SL. ? I have two questions. 1. ?Before I reassemble and lubricate the chuck, how easily should the

Thank you for the picture. Dick

-- Lio, France - Unimat SL x 3

Dick, it is a simple "CNC" pulley , like this one for example CNC Pulley (

Nice work, Lionel Is the aluminum part a timing pulley? Dick

Hi My "DIY" : -- Lio, France - Unimat SL x 3

Hi The Forhman Tool , and a copy "DIY"? ;-) -- Lio, France - Unimat SL x 3

Thank's Roman -- Lio, France - Unimat SL x 3

Paul, I really appreciate your blog (i made several visits there), thank you for all these shares ! -- Lio, France - Unimat SL x 3