Replacing older pivot bearing on Classic 3 with spike-only

Re: Replacing older pivot bearing on Classic 3 with spike-on

Postby masluck1 » Mon Dec 02, 2019 10:50 am

Brf wrote:
masluck1 wrote:Hi brf,

I just checked and I do in fact have the holes there, but no screws and that is the way I got it from the previous owner. I didn't know enough to ask and this solves a mystery, so I can't thank you enough!!! Can you tell me what kind they are (i.e. size/pitch) and maybe I can source them locally if they are not to hard to come by. Also, if VPI still has them, maybe I can get them from them...dunno...thanks again!!!

Mark


Sorry, I don't recall off hand the length and size of the socket head cap screw but they are fairly common. The arm board is tapped for the correct sized diameter and pitch, therefore, you could take you arm board to a hardware store to match the correct size. For length, just make sure that the socket head cap screw clears the plinth holes and allows a 1/2" of thread to go into the arm board.


Thanks again sir!! Do you recall if there were a specific torque on each both (and a tightening pattern - like on a motor's cylinder head/gasket)? I really appreciate all your help and guidance!!!

Mark
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Re: Replacing older pivot bearing on Classic 3 with spike-on

Postby Brf » Mon Dec 02, 2019 12:26 pm

masluck1 wrote:
Brf wrote:
masluck1 wrote:Hi brf,

I just checked and I do in fact have the holes there, but no screws and that is the way I got it from the previous owner. I didn't know enough to ask and this solves a mystery, so I can't thank you enough!!! Can you tell me what kind they are (i.e. size/pitch) and maybe I can source them locally if they are not to hard to come by. Also, if VPI still has them, maybe I can get them from them...dunno...thanks again!!!

Mark


Sorry, I don't recall off hand the length and size of the socket head cap screw but they are fairly common. The arm board is tapped for the correct sized diameter and pitch, therefore, you could take you arm board to a hardware store to match the correct size. For length, just make sure that the socket head cap screw clears the plinth holes and allows a 1/2" of thread to go into the arm board.


Thanks again sir!! Do you recall if there were a specific torque on each both (and a tightening pattern - like on a motor's cylinder head/gasket)? I really appreciate all your help and guidance!!!

Mark


No specific torque or pattern required since there is no gasket to seat, just do not over tighten at the risk of stripping the acrylic threads. I would also purchase some lock washers to put on the cap head side. With 6 bolts holding down the arm board, it's not going anywhere.
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Re: Replacing older pivot bearing on Classic 3 with spike-on

Postby Stringreen » Tue Dec 03, 2019 8:49 am

I have a Classic platter with ball at the bottom....I didn't even know they changed it. Is it worth getting a new bearing? Its on a SuperScoutmaster/rim drive. (but much newer Classic platter)
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Re: Replacing older pivot bearing on Classic 3 with spike-on

Postby Brf » Tue Dec 03, 2019 11:27 am

Stringreen wrote:I have a Classic platter with ball at the bottom....I didn't even know they changed it. Is it worth getting a new bearing? Its on a SuperScoutmaster/rim drive. (but much newer Classic platter)


Very interesting. I did not know that they made a Classic platter with a traditional oil bath bearing. You would need to change the platter also to accommodate an inverted bearing. Too bad you couldn't borrow an inverted Classic platter and bearing and compare it to your oil bathed bearing Classic platter to see if you could discern a sonic difference. Personally, I would not worry about changing it.
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Re: Replacing older pivot bearing on Classic 3 with spike-on

Postby Dorian » Tue Dec 03, 2019 1:13 pm

Brf wrote:Personally, I would worry about changing it.

Did you leave out a 'not' there Brf?
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Re: Replacing older pivot bearing on Classic 3 with spike-on

Postby Brf » Tue Dec 03, 2019 2:26 pm

Dorian wrote:
Brf wrote:Personally, I would worry about changing it.

Did you leave out a 'not' there Brf?


Sure did...thx! Post edited
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Re: Replacing older pivot bearing on Classic 3 with spike-on

Postby Votan » Wed Dec 04, 2019 2:13 am

Brf wrote:Personally, I would not worry about changing it.

Hi Brf
Since it's not clear to me, do you recommend switching to an inverted bearing or staying in the oil bath?
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Re: Replacing older pivot bearing on Classic 3 with spike-on

Postby Brf » Wed Dec 04, 2019 9:07 am

Votan wrote:
Brf wrote:Personally, I would not worry about changing it.

Hi Brf
Since it's not clear to me, do you recommend switching to an inverted bearing or staying in the oil bath?


Personally, I would stay with the oil bath bearing. Proven design and easy to maintain. I must add that I have never had an opportunity to compare an identical platter, within the same system, with the only difference being one having an oil bath vs inverted bearing. There could be sonic differences between the two designs, but is purely speculation on my part.
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Re: Replacing older pivot bearing on Classic 3 with spike-on

Postby Votan » Wed Dec 04, 2019 10:59 am

Brf, I will totally agree with you, especially after my recent experience with inverted bearing ....
I'll be back soon to a new thread on the whole subject ...
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