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VPI Classic motor question

I have a Classic with the 600 RPM motor. The table is 2.5 yrs old. The motor started making a swooshing sound on each rotation about a year ago which continued after lubricating it. The sound could only be heard with the ear to the pulley and the speed stability seemed fine with the SDS. I lubricated the motor again about two weeks ago, including removing the pulley and cleaning the shaft, and the swoosh continued. Today I started hearing a more frequent noise that sounds like a very low friction sound. Still very low, but what the hell?

Is there is anything I can do about it at this point? I don't think putting more oil into the motor after I just lubricated it will fix it. If the speed appears to be ok, should I just ignore it? The first time I heard the noise VPI did not offer any advice beyond lubricating the motor. Is replacing the motor the only way to take care of the problem perhaps?

Any advice and feedback would be appreciated.
actusreus
davt's avatar
davt
500 posts
 
Perhaps the belt. The old jr's had a similar issue that occurred when the belt needed a dusting of their special powder or got too old.
brf
1,715 posts
 
When you lubed the motor shaft did you remove both the pulley and brass collar? The brass collar holds the motor shaft in position. The motor shaft has about 2mm of up and down play and you need to adjust this play until your motor runs silent.
actusreus OP
733 posts
 
Davt,
The sound seems to be coming from the motor, and I re-powdered the belt when I lubricated the motor a few weeks ago. I replaced the belt a few months ago so it should be fine. However, I do admit it is difficult to test it as the pulley does not seem to spin without the belt on, only vibrates. But I will give it a try again.

Brf,
You might be onto something here. Yes, I removed the little brass collar as well, and did notice that the shaft can be moved up or down a few mm, and the collar holds it in position. I believe I pulled it all the way up and tried to fix it in that position by tightening the collar. From your experience, which position renders most silent results?
brf
1,715 posts
 
You need to experiment with the brass collar position. If you pulled the motor shaft all the way up and then fastened the brass collar, that is more than likely the source of your noise. Let the shaft fall the way down, and then pull it up ever so slightly and fastening the collar. Turn the motor on w/o the pulley and listen for noise. If the noise is still present, repeat the process with the motor shaft just a bit higher than previous.
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