Jammed Motor Pulley on shaft of Myford Super 7

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Chris,

" I'd clean the shaft up with a file to lose the burrs "

That's exactly what I have just done ... but it doesn't explain Ted's observation.

MichaelG.

The pulley on the Super 7 (1972 vintage) I have has 2 grub screws - 1 clamping the key (which is present) and one at 90' bearing on the motor shaft, albeit with a little bruise to the shaft. However, I was able to pull the pulley off quite easily without any damage. Did the pulley design change over time? as you all seem to be talking about only one grub screw being present.

CotswoldsPhil

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Unfortunately, it's not going to be a simple job after all

The motor shaft has cleaned-up nicely, but the hole in the pulley is bell-mouthed. presumably because it's been rattling ... all very frustrating, but I shall probably leave it for now: I can re-bore and sleeve the pulley when I fit a 3-Phase motor.

MichaelG.

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Yes, Phil ... I think it must have changed

It seems there might be scope for some further improvement.

MichaelG.

The current Myford part is certainly illustrated with two tapped holes.

MichaelG.

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Edit: Perhaps significant ... according to lathes.co.uk the material was changed from Aluminium to Cast Iron.

Note: My ML7-R has both of the "primary" pulleys in Aluminium.

Edited By Michael Gilligan on 07/09/2014 22:05:03

Adam,

Returning to your original post, about making a puller for pulley removal

I still don't know how many variants there are, but: I've just been cleaning-up my [single grubscrew] Aluminium pulley, and realised that the recess in the face is machined with an angled undercut ... I wonder if there was a special puller that fit this?

MichaelG.

Hi Michael, I am pressing ahead with my horse shoe but unfortunately I only have 13mm thick plate (!) so it is now a trip to toolstation to get a pack of thin cutting discs....

I would drill and tap two holes in the end face of the pulley while it is off. This can then be used with 2 bolts and a bit of bar the next time it needs to be off.