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bogstandard:
Actally Darren, your maths is off slightly, it is in fact 0.02mm, which is a standard metric lathe scale resolution.

Also 0.0254mm relates to 0.001", so very close to imperial, but not quite.

If you did both the topslide (assuming it has the same scale markings) and crosslide, you would in theory be able to convert your machine to metric. I think you said that this has no leadscrew, so it is perfectly feasible.

But be aware, 2mm pitch doesn't sound very big, but my main leadscrew is 3mm and that is nearly 1" diameter, so you would have to find out the diameter first to see if you can squeeze the screw and nut into the leadscrew tunnel.

Nothing is ever as simple as you think.

John

Darren:
Thanks for correcting that error John  ;D

This brings me back to these items, at these prices with the fact that the screw finish "should" be much better than I can manage seems to be the easiest option.

What I'm not sure about is the trapezoid thread. Do I assume this is simple the modern metric eqiv of the imperial Acme thread form?

My current screw is 3/8, a tad under 10mm dia, so the above should be fine.  As long as I can machine the end. I'll have to ask the seller about that.

Yep, you are correct John, no leadscrew, so no worries there.

Darren

http://cgi.ebay.co.uk/TR10x2D-Trapezoidal-Spindle-Acme-Ballscrew-Leadscrew_W0QQitemZ280239661742QQcmdZViewItemQQptZUK_BOI_Metalworking_Milling_Welding_Metalworking_Supplies_ET?hash=item280239661742&_trksid=p3286.c0.m14&_trkparms=66%3A3|65%3A1|39%3A1|240%3A1318

http://cgi.ebay.co.uk/TRTAP-M10x2RH-Trapezoidal-Tap-Acme-Ballscrew-Leadscrew_W0QQitemZ220307826465QQcmdZViewItemQQptZUK_BOI_Metalworking_Milling_Welding_Metalworking_Supplies_ET?hash=item220307826465&_trksid=p3286.c0.m14&_trkparms=66%3A3|65%3A1|39%3A1|240%3A1318

Darren:
Shaped like this

Trapezoidal




Darren

John Stevenson:
3/8" x 10 RH is standard size thread for a Myford both cross slide and top slide.

Contact this guy.

For Sale
Tools
Breaking Myford ML7 & Super 7 lathes most parts available.We accept cards on mail order. Sorry we do not stock parts for other makes of lathes.We are open mon-fri 9-5pm.

JIm Marshall (Trade)
lathe-parts[ at ]new-or-used.co.uk
01205 480 666
Near Boston Lincs
UK

He's very good and ships worldwide.

bogstandard:
Nice one John, just the person to tell us where to get everything from.

John

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