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ML7 cross and top slide threads?

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Andrew Tinsley19/06/2017 14:39:16
1610 forum posts

I am just too hot to venture into my shed, which must be like an oven. Otherwise I would measure up the required thread!

Google and my library don't seem to help either. I am after the imperial threads, definitely acme but what pitch and diameter?

I shall probably need to buy or make some replacements, when I am able to get mobile again after my latest attack of sciatica!

Thanks everyone,


Steven Vine19/06/2017 15:01:50
340 forum posts
30 photos

Well, I would go into my hot workshop, run around, and measure up for you, but I'm glued to an armchair at the moment!!smiley



Edited By Steven Vine on 19/06/2017 15:02:53

Gordon A19/06/2017 15:07:04
157 forum posts
4 photos

Hi Andrew,

3/8 x 10 TPI for both (imperial)


Robbo19/06/2017 15:09:01
1504 forum posts
142 photos

Imperial 3/8" x 10 tpi, see **LINK**

Howard Lewis19/06/2017 15:13:34
6025 forum posts
14 photos

But remember that they will be Left Hand, possibly ACME or square thread form, so that the slide advances when the handle is turned clockwise.


Rick Kirkland 119/06/2017 15:24:15
175 forum posts
I hope to God they're NOT left hand. Otherwise they would work in reverse !!!! And there's no 'possible' about it. They are Acme form.

Edited By Rick Kirkland 1 on 19/06/2017 15:25:10

Howard Lewis19/06/2017 15:46:46
6025 forum posts
14 photos

Rick, If the thread were right hand, as the handle is turned clockwise, you would withdraw the tool from the work.

(I have made a new nut for a Raglan Cross Slide, so know that the thread is left hand.

But we do agree over the thread form!


Rick Kirkland 119/06/2017 16:10:04
175 forum posts
ML7 top and cross slide feed screws are RIGHT HAND ! The nut is stationary and the RIGHT HAND feed screw pulls toward the nut moving the slide forward. If it was Left hand it would back the slide off when rotated clockwise. I've machined new screws and nuts for six ML7 lathes in recent years. The LEADSCREW is Left hand, were it not clockwise rotation would drive the carriage toward the tailstock, not the headstock. Have a think about it.

Edited By Rick Kirkland 1 on 19/06/2017 16:11:26

Rick Kirkland 119/06/2017 16:18:38
175 forum posts
I will add this to assist the thought process. ML7 top and cross feed screws ride with the slide. A left hand thread needs to be used where the slide feed nut rides with the slide. ML7 's have a nut captive on the carriage and the topslide base. Therefore, a Right hand thread needs to be used.
Michael Gilligan19/06/2017 16:39:43
20108 forum posts
1043 photos

Very well explained, Rick yes


Rick Kirkland 119/06/2017 19:09:34
175 forum posts
Thank you Michael G. I do come in handy sometimes. Thankfully.
Howard Lewis21/06/2017 21:57:07
6025 forum posts
14 photos

Quite right Rik, memory failure, (The ML7 went some 14 years ago. But you have reawakened memories of fitting a new nut to the Cross slide)

Apologies for the confusion with moving nut machines!


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