ML7 Datum

ML7 Datum

This topic has 2 replies, 2 voices, and was last updated 12 January 2015 at 15:41 by Roderick Jenkins.

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12 January 2015 at 15:04 #175753
Robin teslar
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@robinteslar
Hi, hope this isnt a dumb question but cant fint it in the Myford manual (lots of basic info missing from that book).

I have followed various thread on how to measure wear on your lathe eg mic the far end outside of the bed, then mic the bit ca 2" from the chuck (presumed to get the most wear

It seems to me that the inside faces of the bed dont get any sliding wear, so should be a suitable datum to measure other factors, such as using a parallel test bar

Any ideas?

Cheers

Robin
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12 January 2015 at 15:04 #23667
Robin teslar
Participant
@robinteslar
Can I presume the inner faces of the bedstock as being true as original
12 January 2015 at 15:41 #175754
Roderick Jenkins
Participant
@roderickjenkins93242
Robin,

It depends how old your ML7 is. Prior to May '72 (SN 107657) the saddle bore on the front guide inner and outer shears, the "narrow guide" system. Later models used the outer front and rear guide shears. If you have the older type the front and rear shears of the front guide will be worn by the saddle and also (slightly) by the tailstock. The rear shear of the rear guide is unused. On newer models the outer shears wear and the only wear from the inner shears will be from the tailstock.. For what it's worth, on my old style S7 I have maximum of 2 thou wear across the front guide but it makes no appreciable difference to the use of the lathe, the saddle just gets a bit tighter towards the tailstock end.

Cheers,

Rod
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