VPI Classic motor question

I upgraded the motor on my Classic 1 to the 300 rpm ver and still used my SDS.

M~

Thanks Macster. I appreciate your response.

See below, my correspondence with Mike from VPI on the re-installation of the brass collar after lubricating the motor.
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Mike,
I have a Classic 3 for over a year with the 300 RPM motor. I took the Pulley and brass collar off and lubricated the motor. What is the prescribed method for re-assembly of the brass collar on the motor shaft?

1. The motor shaft has about 2 mm of play, up and down, should the motor shaft be down when inserting and tightening the brass collar? midway? or up?
2. Should the recessed part of the brass collar touch the fixed part of the upper motor assembly?

I tried a number of positions for the collar. If the collar actually touches the stationary area, and you put your ear up close, you will hear the collar rubbing against the stationary area. When the collar is just barely not touching the stationary area, there is not a sound. Therefore I concluded the correct position of the shaft at rest is at its lowest point, and the correct position of the collar is barely not touching the stationary portion of the motor assembly. So the motor shaft is at its resting point, you put the collar on, and position it so it is barely not touching the stationary area. Turn the motor on and listen. If you hear it hitting the stationary area, you have it too low. Try again. Try and get it so it barely doesn’t touch. Then tighten the allen screw. Is this correct?

*********Answer from Mike at VPI

Close!

When installing the brass collar you lift the motor shaft up, drop the collar on, lightly tighten the set screw. Turn the shaft, if it rotates easily (forget the thumps from the coils and magnets) and you have very little vertical motion of the shaft you are good. You should have very little vertical play but still turn freely. Snug up the set screw.

Mike

It was $150.00 plus the shipping, and I got the new pulley. I never had any problem with removing and installing either pulley. I just loosen the screws, removed the pulley, did what ever it was that I had to do and put it back on and tighten it "snug."

M~

Captain_winters,

Your method makes sense to me. Mike's response does not. Do you understand it? It sounds like he suggests pulling the shaft all the way up. "Very little vertical motion" would simply depend on whether you pulled the shaft all the way up or not before fixing the screw so you're either supposed to do it or not. Also, the shaft turns with the collar, so I don't understand how "turning freely" is a dependent factor in the correct re-installation.

Getting the pulley not to vibrate was a very painstaking process for me so I am very reluctant to remove it yet again to try what you suggested, but it sounds to me like you might be onto a fix. Any other shaft position will necessarily result in the collar virtually touching the stationary area of the motor save for the tiny washer. My only concern about what you suggested is the fact that when I had the shaft all the way down, I could hear a clicking noise in addition to the swooshing noise, which I thought was the shaft rubbing against the bottom of the motor. Moving it up reduced the noise and got rid of the clicking.

So what did you end up doing?