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VPI motor - upgrade to 300 rpm?

I hsve a HW-19 mk 4 plus or something, with the Black knight platter and inverted bearing, along with the SDS, The SAMA is the Hurst 600 rpm. This has run, now, for five years. Recently I have had problems with pitch variation, not easy to locate. The problems have been somewhat solved by glueing the pulley to the shaft and by oiling the motor, helping a lot, but perhaps not fully. Should I order a 300 rpm motor and new pulley? Advice is appreaciated, especially, experiences going from the 600 to the 300 rpm motor.
o_holter

Showing 2 responses by tonyptony

tonyptony
628 posts
 
O_holter, I did this with a new Hurst motor for my AR table. Not a VPI but it does use a Hurst. I did indeed get lower noise and smoother running by experimenting with lower cap values. But there is a price to pay. If you go too low you run the risk of having the motor randomly start rotating in the wrong direction on power up. You'll have to give up a bit of the lowest noise performance you can get (by upping the cap value from that point) to get reliable start up direction.

By a variety of Sprague "Orange Drop" caps up to just below .22uF and they each one out until you get the best compromise (.047, .1, and .15 are available). Use the 716P series.
tonyptony
628 posts
 
I am a bit confused by looking at the Hurst and Elusivedisc web pages. From the latter it appears that VPI is upgrading towards the lower rpm hurst motors, and that the 250 rpm motor is currently the best regarding low noise, but perhaps it cant be done with the hw-19

Unfortunately this is an area outside my knowledge base. I can only recommend doing what you're doing - talking to VPI and maybe searching the web to see what other VPI enthusiasts have done.
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