Workshop tooling

[Kenneth DeightonParticipant @kennethdeighton43272]

I have recently bought a Myford Super 7 lathe No SK 83292, the clutch is very noisy when operating but silent when its disengaged, to dismantle it do I remove the two allan screws and the adjustable nut at the left hand end to find out what is causing the noise ?.

Thanks, Ken.

[Kenneth DeightonParticipant @kennethdeighton43272]

Myford clutch

[Brian WoodParticipant @brianwood45127]

Hello Ken,

There are two versions of the Myford clutch, the serial number of the lathe doesn't help identify which.

It would be wise not to undo anything until the type is identified. Can you post a picture?

Regards

Brian

Edit. Perhaps I should add that the later version operates a cone into a matching taper in the large pulley on the motor end of the countershaft. The other version expands a horseshoe shaped piece into the 4 step belt pulley drive to the lathe spindle. They are notoriously noisy

Edited By Brian Wood on 29/09/2015 08:44:17

[David Clark 13Participant @davidclark13]

Be careful, I think the centre stud is spring loaded and shoots out like a bullet.

[IanTParticipant @iant]

I've had my Mk1 clutch to bits a few times Ken.

My advice would be to get a copy of the Myford S7 handbook and make sure you are looking at the right version as Brian recommends. If you follow the instructions, the work is fairly straightforward but may be complicated by the nature of the problem. My Mk1 clutch rattled loudly and it turned out that the 'push' pin that sits on the tapered part was broken in half. This wasn't obvious at first (the two parts were still in the hole) but a new one was easily made.

One thing worth noting is that the main shaft will only pull out in one direction (at least on the Mk1) – so you can do a lot of damage if you try to force it out the other way. Getting the clutch adjustment "just right" also took a bit of time as it involved some fiddly trial and error but (once set and locked) it seems to hold up well.

Regards,

IanT

[RobboParticipant @robbo]

Ser no 83292 would indicate a lathe from 1966-68, which is about 10 years after the Mk1 clutch was discontinued.

So almost certainly it is the later (and current) cone clutch. Rattles are quite likely to come from the countershaft bearings rather than the clutch itself, though oiling the clutch cone might help..

The advice to get a manual is always sound, there is one on the Myford Yahoo Group file system.

Also have a search on here for previous threads about the Myford clutch.

Always assuming that the lathe is in its original condition. They are now so old that many parts have been swopped "for something better" by previous owners.

[KWILParticipant @kwil]

Yes the spring is very strong on the Mk2.

Please describe the "rattle" Is it continuous? Is it at belt frequency (ie each time the belt rotates completely)?

Your call.

[KWILParticipant @kwil]

 

 

 

Edited By KWIL on 29/09/2015 11:42:15

[Roderick JenkinsParticipant @roderickjenkins93242]

It's probably worthwhile checking that the motor pulley is tight on the motor shaft – mine has occasionally come loose which leads to a rattle. Don't forget, as well, that the clutch cone itself (perhaps surprisingly) needs the odd drop of oil.

HTH

Rod

[Kenneth DeightonParticipant @kennethdeighton43272]

Thanks for the advice friends, I think that I will get hold of a manual first then decide what to do. Ken.

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