Systemic Development > Analog Devices

My Turntable Makes A ‘Grinding’ Sound Upon Spin Up To Speed

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tmazz:
Jim, try giving the platter a little start up spin before hitting the power switch. The bigger torque demand comes when starting the platter up from a dead start. Perhaps if the platter is moving when you first power up the motor it will lower that initial torque load and hopefully get rid of the noise.

rollo:

--- Quote from: James Edward on September 04, 2020, 02:19:27 PM ---Thank you for the replies. So now I have a second question...
I want to troubleshoot this a bit. The platter does not connect with the belt. It sits on top of a smaller diameter sub platter to which the belt is attached. The actual record platter weighs 2-3 pounds. Will I do any damage if I remove the record platter and hit start and listen for the noise. I know internal combustion engines can be damaged by spinning them up with no load. That’s why I ask...
After that, if I still hear the noise, can I disconnect the belt from the sub-platter, and hit start. Same concern in my head regarding damage to the motor.
Thanks.

--- End quote ---


 No no issues. Safe.

charles

rollo:
  BTW a little Talcom powder on belt might help.

charles

James Edward:
Here it is, in painful detail, and a sincere thanks to those who made suggestions.
Troubleshooting was time consuming, because the noise would only happen once on startup every several hours. In other words, I would hear it after the table sat for a number of hours. The longer it sat, the longer the noise would go on, though never more than about three seconds. Shutting the table off, then on within a couple of minutes elicited no noise.
I tried giving the platter a nudge upon startup, same noise.
I inspected the sub platter and no marks.
I tried with just the platter removed. Same noise. I was able to see with a flashlight that no contact was being made underneath the sub platter.
Then:
I tried with sub platter removed(this would be just the motor spinning, no belt attached). Noise again, lower in volume.
Therefore, I believe the sound is coming from the motor itself on startup. I further surmise that possibly there is a bit of lube or something in the motor that needs to be distributed in the first spin up. That might explain why the noise subsides for several hours after an initial ‘cold start’. Similar to an engine where the oil takes several hours to all collect back into the oil pan.
Truthfully, the noise isn’t very loud, I do have to listen for it, and therefore I capitulate to it. I’m going to send a query to Pro-Ject and see what they have to say.
Thanks,
Jim

rollo:

--- Quote from: James Edward on September 17, 2020, 05:22:17 AM ---Here it is, in painful detail, and a sincere thanks to those who made suggestions.
Troubleshooting was time consuming, because the noise would only happen once on startup every several hours. In other words, I would hear it after the table sat for a number of hours. The longer it sat, the longer the noise would go on, though never more than about three seconds. Shutting the table off, then on within a couple of minutes elicited no noise.
I tried giving the platter a nudge upon startup, same noise.
I inspected the sub platter and no marks.
I tried with just the platter removed. Same noise. I was able to see with a flashlight that no contact was being made underneath the sub platter.
Then:
I tried with sub platter removed(this would be just the motor spinning, no belt attached). Noise again, lower in volume.
Therefore, I believe the sound is coming from the motor itself on startup. I further surmise that possibly there is a bit of lube or something in the motor that needs to be distributed in the first spin up. That might explain why the noise subsides for several hours after an initial ‘cold start’. Similar to an engine where the oil takes several hours to all collect back into the oil pan.
Truthfully, the noise isn’t very loud, I do have to listen for it, and therefore I capitulate to it. I’m going to send a query to Pro-Ject and see what they have to say.
Thanks,
Jim

--- End quote ---

  It appears there is a defective shaft of the motor or the motor itself. Ther are no lubed parts that I know of in the motor. Call Pro-Ject.

charles

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