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In Reply to: RE: Question posted by Lew on May 24, 2016 at 08:22:49
I do not know if the reference moved the bottom support pin much closer to the center. in my classic the bottom pin is far enough off center that the platter stands up unless it is lightly pressed down on the arm side. in the Amadeus hey changed the points to teflon v blocks and the shaft is 1/4" thick, so i am not certain if it will stand up on its own without the belt pulling against the blocks. The bottom support pin is supposed to be off center so it has a wiping effect as the shaft passes over the tip of the support. So the spin test may be a bit difficult on the Amadeus :).edit: on a second thought you can lift the arm side of the table a half inch or about, so gravity keeps the bearing engaged.
dee
;-D
True terror is to wake up one morning and discover that your high school class is running the country.
quote by Kurt Vonnegut
Edits: 05/24/16Follow Ups:
Do you think someone might have put some funky lubricant in the OP's bearing such that it has congealed or otherwise turned to glop that is impeding rotation? So, why then does it get worse over the course of playing an LP, I ask myself? Perhaps agitating the lubricant causes it to increase in viscosity dramatically. (This would go in the "impossible but true" category.) But the belt is certainly the number one suspect.
It is slipping from the beginning. If i recall the the motor is rotating at 600 rpm or so. As it slips it gets the string warmer and warmer and it stretches more and more, when it is cold it is tighter :)....plausible? maybe it is just on the border of slipping without any load, the gram or two load from the cartridge generates enough friction to start slipping. If the OP can do the spin test that will eliminate the goop problem in the bearing .
who knows interesting problem.
Different question, the WTR you are familiar with, was it perfectly leveled? Also have to make sure the bearing is adjusted so the shaft is perfectly perpendicular to the top of the bearing cup. any tilt will make it unstable. This can be checked with a gage around the perimeter of the platter, when the bearing is fully engaged. If those conditions are true the platter will not flop by itself, or at least not supposed to be because the offset of the bottom support.
dee
;-D.
True terror is to wake up one morning and discover that your high school class is running the country.
quote by Kurt Vonnegut
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