VPI SDS exact speed in .... 40 minutes?

Why hasn't anyone suggested belt slippage as the cause of this problem (and it IS a problem, not "normal")? I could envision that a high mass platter might slip the belt for several minutes at start-up, if the motor is relatively weak and the belt is not grippy.

The Dual motor Flywheel drive station for sure use a inverted bearing, which should be greased ad I described above, too much grease will cause it to bind up.

I use the SDS on all my belt drive tables along with the Dual motor drive station and it is very stable and up top speed in a few seconds, speed is checked with the Southerland time line.

If your plater is older and do use a well bearing then indeed you should use a thin viscosity oil on the platter bearing.

As far as belt slippage, possible, I use 4 belts from the Dual drive station to the platter so that to me has never been an issue.

Groovemaster

Good Listening

Peter

Peter, do you consider that maybe the problem would be something inside the motors? any idea how to verify if the motors are running ok?

I suppose that is a possibility, but a motor is a pretty simple mechanical devise, and of the many many of them i have had come through here I have never had any issues with the motors. Did you buy a new Dual Drive Station ? How are you checking the speed ? Are you using a SDS ?

If you table ran at speed before you added the dual drive station then the main platter bearing is not the issue.

The only issues I have had is if too much grease is added to the inverted bearings they can bind up causing the speed to vary.

I don't know where you are located but is your close to us here in San Diego your more than welcome to bring it by the shop and I can take a look at it for you.

Good Listening

Peter

Thanks for your offer Peter but Im in the opposite side: Florida.

Yesterday what I have done is run the platter with just one motor and then the other (bypassing the flywheel and one of the motors each time). What is interesting is that the speed is perfect since the beguining. That makes me think that is a flywheel problem, but honestly don't know how that happens: it runs smooth, no noises and have tried using grease and oil with exactly the same results. Any idea?

what Im going to try this evening is run the same test without the SDS and see what happens. What it is interesting is that I need to set the Hz in 58.1 to run the table at 33.33 in the SDS, and should be at 60hz or very close to that right?