Gallery, Projects and General > How do I??

I need to reverse my lathe jaws!

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John Hill:
I have just bought an old lathe, it is a Milnes from the turn of the century before last!  1900 +/-

It came with a 4 jaw and with a very old 3 jaw.  The 3 jaw is quite bashed about and does not have the internal jaws just a set of external jaws.

I am thinking that I should be able to reverse the 3 jaw jaws somehow?  Maybe some surgery and welding?

Has anyone done something like this?

Fergus OMore:
Obviously you cannot easily reverse the jaws unless you perhaps build up the scroll and re-machine it- cutting through the old scroll :bang:

However you can weld onto the existing jaws and do a sort of soft jaw thing. Again, you can make a set of collets or modify your faceplate( if you have one).

However, if your chuck is worn, there is really no easy way to restore its accuracy. Some say you can and I hold a different view.  However, you CAN do a lot of things to an old lathe which will definitely improve it. For the record, LBSC had one.

Any how, the 4 jaw and a faceplate are the things. Enjoy your new acquisition.


Norman

John Hill:
The chuck scroll and fit of the jaws in the chuck body show very little wear. I just seems to have had a short and rather brutal life!  The front of the body is chewed up a bit and there are no internal jaws.  The external jaws are a little, not much, bell mouthed.

I am thinking of cutting the outer lug off the  external jaws and welding a chunk on the recreate the shape of the internal jaws.

Meanwhile I am wondering if anyone has ever done such surgery?

awemawson:
It obviously CAN be done, the question is SHOULD it  :scratch:

The welding will affect the hardening of the jaw. Many jaws are / were made to a standard specification, and there are firms that specialise in supplying after market jaws. Rotagrip in the UK is one such organisation - I appreciate that that's a long way from you !


http://www.rotagriponline.com/index.php?option=com_content&task=view&id=16&Itemid=33

RussellT:
I don't think that's the difficult bit.  The teeth on the back of the jaws would need to be reshaped to fit the scroll, and if you're going to do that you might as well make some new jaws.  There was an article in MEW on how to do that.

Remember too that if you weld them they'll lose their hardness.

If you're intent on modifying the existing jaws then how about machining them flat and adding bolt on jaws - you'd presumably have to anneal them.

Russell

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