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Noisy Motor

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Noisy Motor

Postby Rod » 12 Dec 2018, 04:57

Using my old Myford ML8 after a very long gap, the motor made a loud “cracking” sound on power take up and again when under load ie cutting.
Definitely a crack sound and not a clicking.
Not a continuous sound but so noisy I had to resort to my metal lathe:

Image

Any advice as the cause?

Rod
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Re: Noisy Motor

Postby 9fingers » 12 Dec 2018, 09:20

Cracking or crackling sound? ie mechanical or electrical sound

Assuming mechanical. Are you sure it is coming from the motor itself or the belts pulleys etc

Press a stick between your ear and various parts to try and locate the source of the noise.

Hth
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Re: Noisy Motor

Postby 9fingers » 12 Dec 2018, 11:00

Further thoughts after having had coffee :lol:

If you change the belt position to a different spindle speed. does the repetition rate of the noise change?

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Re: Noisy Motor

Postby TrimTheKing » 12 Dec 2018, 14:43

Mmmmm Myford! They are a cracking lathe so I've heard...

:eusa-whistle:
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Re: Noisy Motor

Postby Rod » 12 Dec 2018, 19:50



Didn’t get much time to play as we are having replacement windows fitted.

The noise seems to be coming from the area of the switch which is also the same level as the motor.
The noise sounds like a very loud, sharp crack every time you switch on. Very occasionally it crackles on switch on but does this when cutting.
I’ve recorded the sound but how can you post it?

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Re: Noisy Motor

Postby 9fingers » 12 Dec 2018, 20:03

Rod wrote:The noise sounds like a very loud, sharp crack every time you switch on. Very occasionally it crackles on switch on but does this when cutting.Rod


this seems to be contradictory?

Rod wrote:I’ve recorded the sound but how can you post it?

Rod


We cant host audio files on the forum. You will have to host it yourself and post a link on the forum.

From your description it sound like an electrical problem related to the switch - might even be a loose wire :lol:

Bob
Information on induction motors here
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Email:motors@minchin.org.uk
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Re: Noisy Motor

Postby Rod » 13 Dec 2018, 01:10

On switch on you get an instantaneous loud crack and then silence apart from the normal lathe running noise. When cutting into the wood you get the intermittent but longer crackling noise.

I’ll try to post the sounds given the chance.

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Re: Noisy Motor

Postby HappyHacker » 13 Dec 2018, 11:32

I am with Bob on this one, it sounds like a poor connection that is sparking when load is applied at startup and when working hard. A simple check would be to disconnect from the mains, take the cover off the switch box and check the tightness of connections. Use an insulated screwdriver as there is probably a motor capacitor which may take time to discharge which could give you a jolt. Look for any burning or arcing at the connections which may mean it would be better to remake that connection. I am not familiar with your lathe so the above is a very generic advice and what I would do first if faced with your noise. Also you could try the tug test to make sure all the wires are securely located in the connections, just give a gentle tug with long nose pliers or your fingers if you can get hold of them.
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