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In Reply to: RE: Music Hall MMF 7.1 - tonearm gimbal bearing rattle posted by knathanson24 on July 15, 2016 at 18:13:23
That certainly sounds as if the bearings are not properly adjusted as there should be no discernable play.Adjusting tonearm bearings is a skilled job and if you need to ask IF they need adjusting then I think it reasonable to conclude that you do not have the relevant experience and expertise in this area. Please do not attempt this yourself as it is easy to damage the bearings and you have no way of knowing if you have set the correct loading as factory specified. It would be like like trying to set precise VTF without a gauge and not knowing what the force should be anyway.
I would suggest that you contact Music Hall for their advice.
Edits: 07/16/16Follow Ups:
To get the tiny bearing 'just right' is a genuine challenge.
Loose? well they are just loose.
Too tight? even a tiny tiny bit too tight and very bad.
Always better a tiny bit loose than a tiny bit tight.
The secret is almost tight, but not at all. But not loose.
The biggest problem is most bearing adjusters are a PITA.
So half the battle is getting it all just right AND the bearing adjustment nut.screw/device is also tight after finishing. Without the bearings getting messed up AGAIN.
If you can assemble and adjust a watch.. You can easily do the bearings.
I work on Dual turntables, and quite often come across an arm in need of bearing adjustment. Even though these bearings are open and non-lubricated, I cannot see how any of them could have loosened-up without being fooled with.
The only way to adjust these things with any accuracy, is to remove the arm from its mounting board first, then adjust by feel. Easy to do with great accuracy, but too tight, and both the bearings and your records will get ruined.
While someone may have messed them up, since my MMF7 shipped with overly tight bearings (wasn't horrible, but arm didn't float as it should while zero balanced), loose bearings could be the other side of a QC issue.
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