Myford ml7 21 tooth change gears

Neil,
It's usually the other way around as you see above where those who prefer working to as close a tolerance as possible are pilloried for it

Unless you have some very good measuring equipment I doubt the threads produced by the approximations would trouble most people most of the time. It would be interesting to measure how good the threads are produced by a theoretically perfect setup.

Mike

Thank you for the replies, for my accuracy it will be if it works it' close enough, if it dont then it' back to the drawing board. I'l never be able to get accuracy down to microns on an ML4 but if I can get it to under a thou accuracy on any given part then that will be good enough for me. Others might disagree but most drawings are only to +/-0.001" tolerance, others 5thou. So for most application I should be set.

Ah, well if one has the luxury of the correct gears, then of course they are the ones to use. I lie in bed at night and dream of such luxury!

And your threads may well still be more accurate than mass produced hardware store nuts and bolts that seem to work perfectly well. Have fun with that old ML4. There is a perverse pleasure that comes from doing accurate work on such old machinery.

Hi all, stupid question but I've just bought the 34/33 teeth gears to cut metric on my imperial lathe. I'm presuming you have to leave the half nuts engages and run the saddle backwards after each cut?

Well perhaps we should respect personal choice either way.

Neil

That's the usual approach.

It's possible to fit a device that declutches the leadscrew while ensuring relative alignment is kept, but that's a choice for those doing many threads.

Neil