RB300 bearing removal - diyAudio
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Old 5th July 2004, 05:01 PM   #1
penance is offline penance  United Kingdom
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Default RB300 bearing removal

How do i get the bearings out of the armtube on an RB300?
Cant work it out
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Old 5th July 2004, 05:33 PM   #2
sreten is offline sreten  United Kingdom
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The obvious question is why ?

Cant work it out.

But if your prepared to damage the bearings
its easy, you use an extractor tool.

sreten.
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Old 5th July 2004, 05:38 PM   #3
penance is offline penance  United Kingdom
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well i have a incognito kit on the way, thought i would polish the arm. Purely for reasons of vanity

Wont bother if that is the case, i best stick it back together and hope that the incognito doesnt need the original wire to pull it thru.
Bearings seem a bit noisy tho.........
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Old 5th July 2004, 05:52 PM   #4
sreten is offline sreten  United Kingdom
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Well at a guess paint stripper will get the paint off the arm tube
and Duraglit (or metal polish) should bring it up a treat, though
you may have to lacquer it to keep the high polish finish.

WD40D seems a good bet to wash out the bearings and leave
some film protection after all this, which you should of course
keep covered / sealed as much as possible, wax is good for
this - use organic solvent when you've finished, then WD40.

JMO but I think the bearings are press fit, destroyed removal.

sreten.
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Old 5th July 2004, 06:35 PM   #5
penance is offline penance  United Kingdom
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I think your right.
Im not to keen on trying to polish with the bearings in situ, bit worried about rubbish getting in, particularily now they dont feel so good.
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Old 5th July 2004, 07:05 PM   #6
sreten is offline sreten  United Kingdom
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If you wax the bearings I can't see the problem.

"now they don't feel so good ", compared to when ?

An optimally rigid ball race bearing will feel rough when
its not attached to the relevant masses its optimised for.

sreten.
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Old 5th July 2004, 07:08 PM   #7
penance is offline penance  United Kingdom
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compared to good bearings i have worked with before (admittedly, in engineering and not so small).
Just seem noisy when spun, almost sound dry.

I think i will give up on the polish idea, seems a lot of work for no gain.
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Old 5th July 2004, 07:31 PM   #8
sreten is offline sreten  United Kingdom
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Ever adjusted ball bearings ? - wheels or crank on a bicycle ?

Optimum rigidity is one small step away from hideously rough,
and for a bicycle and most bearings rigidity is hardly the point.

A rigid bearing should feel rough, if it doesn't its not rigid enough.

sreten.
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Old 5th July 2004, 07:41 PM   #9
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.... there may well be better cablin avaliable, but the problem is that fitting it means disassambling the tonearm. Given that without correct tools and jigs it`s almost impossible to reconstruct the bearings or dress the cables to correct tolerances, they feel (REGA team) that the loss of performance will more than undermine any potential benefits.

Taken from HI-FI+ Issue 27 - Nov/Dec 2003, article by Chris Binns after Rega factory tour. He is talking about one of the most important wievs of tonearm production, that is putting together the bearing and tensioning, which require specially developed jigs and a lot of skill and practice. He said that REGA would be happy to provide the tools and training necessary to assamble the tonearm corectlly (services, dealers.... I supouse), but only company which have taken them up on the offer was Michell Engineering. They do fit Incognito wireing, and the writer of the article feel that that is only worthwhile and costeffective way to do the mode.

I know that people do that mode as a DIY project , I just wanted to point you to an interesting article, talking about that, that the tone arm is extremly precise piece of equipment, and that reassembling can couse a lot of problems when not taken corectlly. It woud be a waste of money I think.

BTW: I`m allso considering rewireing of my RB300 and I was allso warned by a friend, who hapend to know a lott more them me about that mather

Best regards
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Old 5th July 2004, 07:56 PM   #10
penance is offline penance  United Kingdom
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well it has gone back together, and feels OK. I'm not worried about the rewire, maybe some fetling involved but i rekon i can do that.

Sreten,
Yep i have adjusted many bearings, working in the electrical motor industry (not now tho) i have used many different types, from taper roller to needle etc. Not trying to show off, just pointing out that i have experience of bearings. Now its back together it feels OK.
I appreciate your help, many thanks
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