Author Topic: My Turntable Makes A ‘Grinding’ Sound Upon Spin Up To Speed  (Read 205 times)

Offline James Edward

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https://www.crutchfield.com/S-0X5wrnGsiEU/p_252DCESDGR/Pro-Ject-Debut-Carbon-Esprit-SB-DC-Gloss-Red.html

I used the word grinding, which connotes a metallic sound, though this sounds more of a plastic sort. But I can’t be sure. It goes away after several seconds and the speed light comes on to indicate it is steady. I removed the belt and platter to see if I could see anything amiss. I saw nothing. The spindle appears to have a light film of oil. I don’t know if that is the source of the sound; should it have more? No idea...
When I replaced the platter, started the table, there was no noise. Next start the noise was back. Again, this lasts 3 seconds, then all is quiet.
Mountain out of a molehill? I can accept that. Do tell...
Thanks.
Jim
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Offline Nick B

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Re: My Turntable Makes A ‘Grinding’ Sound Upon Spin Up To Speed
« Reply #1 on: August 31, 2020, 07:47:47 PM »
Shouldn’t be making that noise. Wonder if that is a part that briefly engages on startup and then maybe doesn’t retract properly for a few seconds. If you bought it at crutchfield, maybe give them a call. I did a couple of Google searches and couldn’t find anything that related. Good luck
Nick
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Offline rollo

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Re: My Turntable Makes A ‘Grinding’ Sound Upon Spin Up To Speed
« Reply #2 on: September 04, 2020, 12:08:48 PM »
  Sounds like a turn on issue involving belt and or torque from the motor. Contact Manf. Should not make any noise.

charles
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Offline James Edward

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Re: My Turntable Makes A ‘Grinding’ Sound Upon Spin Up To Speed
« Reply #3 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.
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Offline Nick B

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Re: My Turntable Makes A ‘Grinding’ Sound Upon Spin Up To Speed
« Reply #4 on: September 04, 2020, 02:48:23 PM »
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Offline tmazz

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Re: My Turntable Makes A ‘Grinding’ Sound Upon Spin Up To Speed
« Reply #5 on: September 04, 2020, 03:41:11 PM »
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.
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Offline doug s.

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Re: My Turntable Makes A ‘Grinding’ Sound Upon Spin Up To Speed
« Reply #6 on: September 09, 2020, 09:41:20 AM »
i'd definitely start it up w/only the subplatter.  me personally, i wouldn't worry at all about there being less weight.  more weight might be an issue depending on the motor, but not less.  but if you are worried, you could always center a weight on the platter.  a weighted record clamp would be perfect. 

based on the layout, w/the motor suspended on an o-ring rubber band, i bet you find the rubbing.  and, i'd suspect it to be the edge of the motor base on the underside of the subplatter, based on the diagram from the manual that nick posted, and foto's on the web of the pro-ject, and other turntables w/similarly suspended motors...  (or maybe it's the belt rubbing on the o-ring?  but it seems unlikely, and i'm not sure it would make the noise you describe.)  if it is rubbing, you may be able to see marks on the motor base, and/or the underside of the subplatter w/o even running it.  adjusting the screws holding the motor and/or o-ring should fix it.



doug s.
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.
« Last Edit: September 09, 2020, 09:44:16 AM by doug s. »

Offline rollo

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Re: My Turntable Makes A ‘Grinding’ Sound Upon Spin Up To Speed
« Reply #7 on: September 09, 2020, 09:58:00 AM »
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.


 No no issues. Safe.

charles
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Offline rollo

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Re: My Turntable Makes A ‘Grinding’ Sound Upon Spin Up To Speed
« Reply #8 on: September 09, 2020, 09:58:36 AM »
  BTW a little Talcom powder on belt might help.

charles
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Offline James Edward

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Re: My Turntable Makes A ‘Grinding’ Sound Upon Spin Up To Speed
« Reply #9 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

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Offline rollo

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Re: My Turntable Makes A ‘Grinding’ Sound Upon Spin Up To Speed
« Reply #10 on: September 17, 2020, 08:12:08 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

  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
contact me  at rollo14@verizon.net or visit us on Facebook
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