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Leadscrews

Hi all, I am new here. I have just bought a Granville Senior Lathe,(some parts are similar to a Myford ML7) probably as old as I am. Unfortunately the leadscrews on the cross slide and topslide are not as desired. The crossslide has got a really badly worn nut with about 4mm play longitudinally.You can see the wear marks on the screw. The Topslide has had the original leadscrew removed, the topslide reversed and a new hole drilled and threaded to take what looks like a Whitworth thread.

So , my question is, where can I get replacements? do I a) send off to an engineering company to get new screws and nuts? b) obtain Myford screws and nuts? Does anyone know if they will fit?

I I go for option a), is it worth going for a ball-screw system?

If I had a working lathe I could I suppose cut some new screws, but its a bit like 'theres a hole in my bucket'

Does anyone have a copy of the manual for the lathe? I would be willing to purchase one.

Reply to
cycaduk
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Assuming they are Acme thread, you can buy lengths of Acme threaded rod for very reasonable prices. Cut to length, shape the ends as needed. As for the crossfeed nuts, you can refresh the existing ones with Moglice.

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Reply to
Rex B

They'd need to be left hand threads wouldn't they?

Randy Replogle

Reply to
Randy Replogle

Maybe. I can't recall without making twirly gestures with my fingers and attracting undue attention in the office. But those are available also.

Reply to
Rex B

Hi, Go to

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they have details of the Senior. Regards. Rotty

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Reply to
Rotty

Reply to
wayne mak

According to :

[ ... ]

For a manual machine? That is really asking for trouble, as the cutting forces can easily drive a ball-screw backwards.

On CNC machines (which can really benefit from ball screws), there is always a stepper or servo motor resisting those forces, so you should have no problems. But this does not sound like a CNC machine to me.

Good Luck, DoN.

Reply to
DoN. Nichols

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