Myford ML7 help! Video

I've just purchased this myford ml7, first time I've turned it on today. The motor seemed to get progressively worse the more I used it, but even when I first turned it on it sounded ropey. If you could take a look and suggest any improvements! Thanks.

video

https://youtube.com/shorts/HyRya8RLSSg?feature=share

Edited By JasonB on 01/04/2023 13:06:02

Yikes! Start by pulling off the rear fan cowling, they are easily dented by rough handling. Mechanically these motors are nothing more than a spinning shaft with a bearing at each end. Simple enough to service if you can pull it apart.

The next step is take the belt off between the motor and countershaft to see if the motor is definitly the source of the noise. Also check that all the pulleys are not slipping on the shafts.

Les.

And while you have the motor fan cover off, see if the fan is secured to the motor shaft.

Motor looks to be running way to slow to me suggesting more than just the fan to me. Does not seem to be getting upto speed so maybe a start capacitor or switch problem.

Looks like a non-original motor to me, more like a MachineMart one like I have on a Myford. Nothing at all wrong with that, but rear cover is most likely plastic, so unlikely to be dented BUT may have been broken with bits falling into inconvenient places. However, I think following the advice given above is a sound way to proceed.

I'm thinking loose pulley.

Rob

If Jason is right then it may already be to late for this motor. As the motor speeds up can you hear a click ? or as it slows down - this will be the centrifugal switch working - not always audible though. The start windings will burn out in little more than a few 10s of seconds ! If the motor doesn't spin up to speed almost instantly with the belt off start capacitor may have failed. Is the motor wired up correctly ? Has it got a reversing switch ? Some members may be able to help you if your near them - where are you ? Noel.

As Jason says above.

Assuming the Myford itself is not very stiff

The motor is very slow and nowhere near 1400rpm.

The capacitor should be in the black plastic box and not mounted in a terry clip. Someone has tried to fix it and failed.

Running it in it's current slow state the start winding will be constantly powered and hence overheating.

You likely need a new motor.

FWIW the drive pulley /countershaft gearing is way off; a 2"-and-a-bit-ish motor pulley should be driving an 8 or 9" pulley on the countershaft, so at the moment the motor is having to work extra hard (like trying to pull away in top in a car).

It will help a lot if you put the lathe spindle drive onto the 'slowest speed' pair.

The motor might also be clapped, or even a bit cooked from this treatment, but fixing the gearing before further testing will at least clear the field for an unambiguous result.

Edited By DiogenesII on 01/04/2023 12:21:24

Also the countershaft bearings look dry. I'd expect to see some evidence of oil at the ends of the bearing sleeve.

Robert.

Looks like your Vee belts are loose to me.
Tighten them and run the lathe again.
Gingerbeer