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In Reply to: Re: roller bearings and metal plate under CDP? posted by Rob Thomas on August 18, 2003 at 16:19:58:
" So, it should be fine, but further mass loading may improve the damping transmission."weight above the bearings seems to defeat the purpose. I don't know the logic, but I suppose it has to do with the increased rolling resistance on the contact surface between balls and player. I added some sand on top of the player and it started to sound less and less detailed. This could be due to the soft/thin metal plate on the bottom of the player, which I am trying to replace with the sheet of thick aluminum. I'll try it againg after the conversion, but so far weight anywhere above the bearing ball contact point has not been showing any positive effects. There's some weight that gets added because of the damping and the plate, but it won't be anywhere near the amount I added when things started to sound really muddy in my sand bag test.
Follow Ups:
"I suppose it has to do with the increased rolling resistance on the contact surface between balls and player"I think the precision of the parts machining and their hardness come into play here.
See my post with links to the Ceraball and Cerabase below.
more weight will demand more from any high quality part. I suppose that you can get away with heavier loads on a very hard metal bearing, tungsten balls, super hard component surface.The problem is that I am still using $0.98 / piece walmart chromed basting spoons to support the bearing balls. Once I can afford high grade machined bases, I will try mass loading again.
Peter
Ceramic balls.I just received three sets of Ceraballs which use a ceramic ball smaller than a pea as the roller. They claim the balls are sourced from the US.
Initial results are impressive.
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