Myford Lathe Problem

Myford Lathe Problem

This topic has 6 replies, 5 voices, and was last updated 28 January 2012 at 23:13 by Chris Trice.

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28 January 2012 at 16:32 #5902
peter brown 5
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@peterbrown5
Cross slide
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28 January 2012 at 16:32 #83278
peter brown 5
Participant
@peterbrown5
i have a Myford 1989 S7 lathe and am losing registration on the cross slide between the ball handle and the micrometer dial.No matter what I try, dismantling and cleaning leaving, the shaft dry or a light touch of oil, I have also tried fitting a new diaphragm washer but all to the same result loss of registration. Can somebody help in my quest .
28 January 2012 at 17:23 #83284
colin hawes
Participant
@colinhawes85982
Idon’t have experience of the Myford,but it is not uncommon for the dial to be fitted with a spring- loaded ball for friction.This ball can be lost on dismantling.

Colin
28 January 2012 at 18:11 #83286
Tony Pratt 1
Participant
@tonypratt1
Hi Peter, exacty what do you mean by ‘losing registration’, does the dial spin freely without the ball handle moving? Is the tapered spigot which the dial rotates on loose on the cross slide screw?

Tony
28 January 2012 at 18:49 #83288
peter brown 5
Participant
@peterbrown5
Hi Guys, Colin There is no ball it’s just a friction drive with the diaphragm washer. Tony when rotating the ball handle to take a cut the micrometer dial moves some of the time but not all of the time when rotating the ball handle, hence you do not know how much you have taken off , that is what I think I mean by losing registration. Peter.
28 January 2012 at 18:55 #83289
blowlamp
Participant
@blowlamp
It sounds like the end bracket may have a shallow pocket worn into it and/or maybe the thrust face on the feed screw is also worn.

Any of this will allow the dial to touch the end bracket and move slightly in use. That is, there should be a small gap between the bracket and the dial.

Martin.
28 January 2012 at 23:13 #83306
Chris Trice
Participant
@christrice43267
Sometimes turning the spring washer around can help. It is only supposed to fit one way though. The alternative is a narrow shim washer inside the dial where it contacts the feedscrew.
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