A1999 Tumbler sleeve gear retaining screw H43

[DazzamatazzParticipant @dazzamatazz]

I have had the A1999 Tumbler sleeve gear retaining screw H43 shear on my Myford Super 7. I have had 2 new ones supplied by Myford this week and both are to big the TPI is correct at 32 but the diameter is to large. Does anyone know the correct size. My lathe was build between 1991-1994.

Regards Darren

[DazzamatazzParticipant @dazzamatazz]

[Brian WoodParticipant @brianwood45127]

Hello Darren,

I'm surprised Myford have supplied you with oversize parts [twice from what you say]

The screw thread is 2BA which isn't far from 32tpi but is actually 31.36 tpi and easy to mix up.

Try a 2BA screw instead.

Regards Brian

[Mike PooleParticipant @mikepoole82104]

10×32 UNF, M5x0.8 and 2BA are all very close to each other, tricky when sorting the mixed useful fastener tin.

Mike

[DazzamatazzParticipant @dazzamatazz]

I have had a check this morning after arriving at work we have no BA nuts and bolts but i have tried 10×32 unf and 5mm.

I can get a 10×32 unf nut to run up the old broken part with no play and a 5mm nut will run up the new parts supplied by Myford.

I will try a 10×32 unf bolt when i get home.

Regards Darren

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Michael Poole on 26/06/2014 22:58:51:

10×32 UNF, M5x0.8 and 2BA are all very close to each other, tricky when sorting the mixed useful fastener tin.

.

Too true !!

Unless you happen to have some proper thread gauges to hand; it's worth tapping a set of holes side-by-side in a plate, and marking these for reference. Keep the plate in or near that tin.

MichaelG.

[DazzamatazzParticipant @dazzamatazz]

Myford asked for the model and year of the lathe yesterday morning and I have not heard from them since.

10×32 unf bolt did not fit so I do not know what size it is.

I tool the tumbler reverse of the lathe and drilled and tapped it to 5mm.

Now the lathe is up and running again.

[Author]

Posts