Hole in my crikus bearing
Posted by: jonni on 08 April 2003
I've had a Cirkus bearing fitted to my Linn for about 6 months and noticed the sound seamed to be getting worse.I was blaming my cartridge.
I took the inner platter out today and looked at the spindle.There was some dust near the tip which i cleaned off and i noticed that on the very tip of the bearing there was a very small flat spot.
is this normal?
The sound got considerably better after cleaning the dust off but i'm not sure the sound is as good as when it was new.
I took the inner platter out today and looked at the spindle.There was some dust near the tip which i cleaned off and i noticed that on the very tip of the bearing there was a very small flat spot.
is this normal?
The sound got considerably better after cleaning the dust off but i'm not sure the sound is as good as when it was new.
Posted on: 08 April 2003 by Martin Payne
Jonni,
dust? Sounds like there's no oil in that bearing???
Martin
E-mail:- MartinPayne at Dial.Pipex.com
dust? Sounds like there's no oil in that bearing???
Martin
E-mail:- MartinPayne at Dial.Pipex.com
Posted on: 08 April 2003 by Tarquin Maynard - Portly
Jonni
I am a bit concerned to read that there is dust on your bearing - it should be lubricated with a PTFE based oil which is at odds with dust.
If not, this could be the reason why it sounds worse - and IMO is the reason why the dealer should replace free of charge.
Regards
Mike
I am a bit concerned to read that there is dust on your bearing - it should be lubricated with a PTFE based oil which is at odds with dust.
If not, this could be the reason why it sounds worse - and IMO is the reason why the dealer should replace free of charge.
Regards
Mike
Posted on: 08 April 2003 by jonni
There is oil in my bearing, maybe the dust got in there while it was being oiled.
I just hope it was dust and not tiny bits of metal or something like that.
Should I take the Linn back to the shop?
I just hope it was dust and not tiny bits of metal or something like that.
Should I take the Linn back to the shop?
Posted on: 08 April 2003 by Paul Ranson
I don't think you should have a noticeable 'flat spot'.
It's hard to get a clear shot, I think that if it were flat tipped it would be obvious? Anyway this is my relatively ancient 94/95 era Cirkus bearing.
Paul
It's hard to get a clear shot, I think that if it were flat tipped it would be obvious? Anyway this is my relatively ancient 94/95 era Cirkus bearing.
Paul
Posted on: 08 April 2003 by jonni
Can't really tell much from that photo Paul as its side on.The flat spot is very very small but wasn't there when new.I'd say less than half millimetre and it wasn't a speak of dust.
Maybe I havent been gentle enought replacing the platter.
Can bearings just go wrong or does something have to get in there to causes damage?
Maybe I havent been gentle enought replacing the platter.
Can bearings just go wrong or does something have to get in there to causes damage?
Posted on: 08 April 2003 by Paul Ranson
You aren't going to see a flat spot head on.
I think a noticeable 'flat spot' on the tip of the bearing is wrong. It should be spherical, as it appears in my pic.
Perhaps the Linn service manuals discuss this?
Paul
I think a noticeable 'flat spot' on the tip of the bearing is wrong. It should be spherical, as it appears in my pic.
Perhaps the Linn service manuals discuss this?
Paul
Posted on: 08 April 2003 by Tarquin Maynard - Portly
Jonni
I think you have something amiss here. The bearing is not "oiled" but rests in a reservoir of oil. If you have dust near the tip, there is not enough oil in it.( IMO )
You mention "when replacing the platter" - the spindles I have seen drag oil out when lifted, but why have you been taking the inner platter out? ( I'm curious.)
Take it back to the dealer; advice is free ( although the remedy might not be.)
Regards
Mike
I think you have something amiss here. The bearing is not "oiled" but rests in a reservoir of oil. If you have dust near the tip, there is not enough oil in it.( IMO )
You mention "when replacing the platter" - the spindles I have seen drag oil out when lifted, but why have you been taking the inner platter out? ( I'm curious.)
Take it back to the dealer; advice is free ( although the remedy might not be.)
Regards
Mike
Posted on: 09 April 2003 by jonni
Hi all.I'm not in the habit of taking the inner platter out I ment the otter platter, which I have had to remove in order to tweak the set up when I changed arms recently.(I use my turntable rack as a jig so have to take the turntable off and remove the top board)
When i changed the arm I did remove the inner platter but sealed the bearing housing with the red cap and made sure i keep the inner platter covered and free of dust .Of course when you're doing all this there is some time when the spindle and housing are going to be expossed to the elements.
When i changed the arm I did remove the inner platter but sealed the bearing housing with the red cap and made sure i keep the inner platter covered and free of dust .Of course when you're doing all this there is some time when the spindle and housing are going to be expossed to the elements.
Posted on: 09 April 2003 by greeny
There will be wear of the bearing over time and a flat spot will develop, however I would not expect to see this after 6 months.
When I remove the inner platter there is oil just about dripping off the end - hence no posibility of dust. I would have to wipe the end to get a good view. When you put the platter back in how long does it take to settle, cos this should take a while(several seconds), though it is longer on none cirkus bearings I think, this is as the oil seeps back up the bearing sleeve.
When I remove the inner platter there is oil just about dripping off the end - hence no posibility of dust. I would have to wipe the end to get a good view. When you put the platter back in how long does it take to settle, cos this should take a while(several seconds), though it is longer on none cirkus bearings I think, this is as the oil seeps back up the bearing sleeve.
Posted on: 09 April 2003 by Andrew L. Weekes
This is wrong - the bearing should, as Paul says, be spherical. If it's not, it's knackered, and will affect sound severely.
The new Cirkus should have included a new inner platter, and should not wear in 6 months. In fact the precision of the design is that wear is infinitesimally small, unless not lubricated, or maybe contaminated in your case.
This should be a FOC replacement, if the Cirkus was new, and dealer fitted (and hence contamination was his fault, or due to faulty manufacture).
Andy.
The new Cirkus should have included a new inner platter, and should not wear in 6 months. In fact the precision of the design is that wear is infinitesimally small, unless not lubricated, or maybe contaminated in your case.
This should be a FOC replacement, if the Cirkus was new, and dealer fitted (and hence contamination was his fault, or due to faulty manufacture).
Andy.