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Myford ML4 cross slide backlash

ACME thread cutting

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Mike Sparks07/08/2020 14:38:05
2 forum posts

I am restoring a 75 + yo Myford ML 4. There is 75 thou backlash in the cross slide which is in the cast iron thread not in the turn wheel gap. This model does not have a bronze nut! I want to make a couple of bronze nuts but cannot locate a 5/16in x 12 TPI ACME tap, or preferably a 3 part set. Tracy tools will make one for £200 + Vat, more than lathe is worth probably. Any help for a beginner appreciated. I note that most messaging is for ML7's which I believe have 3/8in lead screws and taps are available.

old mart07/08/2020 16:39:53
1906 forum posts
151 photos

You may find it easier to use the later parts with a new leadscrew and nut bought and modified.

Mike Sparks07/08/2020 18:38:01
2 forum posts

Thanks for feed back Old Mart. I have considered this, going for a 3/8in leadscrew in saddle slide and cross slide definitely opens up tools readily available. Have to check that tapping the castings 3/8 ACME allows sufficient thread cover, the tapped through hole is very close to the tool post mounting plane. The ML4 is clearly a much lighter item than 7 series, guess Myford had learnt lessons during WW2 period.

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