2. analog
  3. 1406153108

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

Hi,
I bought a VPI TT with double motor/flywheel. Normaly use to take about 30 -40 minutes to get the exact speed. after 10 minutoe is very close but to be exactly at 33.333 needs that time. Do you consider this is normal?
jorsan
bpoletti
1,558 posts
 
The half-black and half acrylic platters are for earlier TNT and Aries tables. (I've got one) They use well-type bearings. So I don't think you're discussing inverted bearings. They should be oiled, not greased.

Not sure about the bearing on the HR-X.

But I don't think the bearing is the problem. I would look upstream at the SDS. How long should an amplifier take to reach stability? How long for a tone generator?

That's why I suggest a call to VPI.
lewm
13,538 posts
 
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.
pbnaudio's avatar
pbnaudio
1,615 posts
 
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
jorsan OP
178 posts
 
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?
pbnaudio's avatar
pbnaudio
1,615 posts
 
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
More to discover