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   Home » Analog Playback» Micro RX5000: is that bearing spins normally? (8 posts, 1 page)
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  »  New  Copper Mat on a Micro Seiki Gun Metal Platter..  Size of ceramic ball...  Analog Playback Forum     122  414657  10-07-2015
02-03-2014 Post does not mapped to Knowledge Tree
wonderworld
Posts 11
Joined on 01-31-2014
Post #: 1
Post ID: 20518
Reply to: 20518
Micro RX5000: is that bearing spins normally?
fiogf49gjkf0d
I was offered to buy Micro seiki RX5000. The seller sent me a short video. If you see it carefully you will notice that the platter moving slightly up and down. Is that that normal or this could be sign that the bearing is not in good condition? http://youtu.be/StrQXmiPfcI
02-04-2014 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 10,160
Joined on 05-28-2004
Post #: 2
Post ID: 20525
Reply to: 20518
I might be mistaken of cause.
fiogf49gjkf0d
Yes, it does look like “wrong” but I do not think that it is an indication of a problem. The bearing would not give you the wobbling that you would be able to see with your eyes. It is also very unlikely that the platter has different high and not balanced. I do think that it is some kind optical illusion or camera was moving. I do not know. However, I do not think that it shall be a problem.

"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
02-05-2014 Post does not mapped to Knowledge Tree
be
Copenhagen, Denmark
Posts 86
Joined on 02-12-2007
Post #: 3
Post ID: 20536
Reply to: 20518
Non perpendicular shaft?
fiogf49gjkf0d
I you play the video full screen and place the cursor at the top or the bottom edge of the platter, it seems clear that the the platter wobbles since they go up and down synchronously and the upper edge of the turntable chassis is not moving at all.

It could cause some wow since the radius of the platter, as sensed of the string, will vary.
Furthermore the tracking angle would change more than some people would like?
Also it might cause terminal sea sickness just looking at it.
02-05-2014 Post does not mapped to Knowledge Tree
wonderworld
Posts 11
Joined on 01-31-2014
Post #: 4
Post ID: 20538
Reply to: 20525
If the bride is in US, but I am in Europe:
fiogf49gjkf0d
Is there any way to choose the "right wife" only by video and photos whithout trying her? Wink You are well experienced Romy, which are the symptoms of the "wrong", wobbling or worn out bearing when we buy Micro Seiki RX or SX? Anyway I would like to get merried in a right MS8000, how to recognize the "right" TT shaft? Here is an video example of another used RX5000 for sale with even worse moving up and down platter: http://www.youtube.com/watch?v=0z5slGdeivs
02-05-2014 Post does not mapped to Knowledge Tree
wonderworld
Posts 11
Joined on 01-31-2014
Post #: 5
Post ID: 20540
Reply to: 20536
Symptom of worn out bearing?
fiogf49gjkf0d
It seems that all of much used Micro RX or SX TT's have the same problem, is that right? It will be nice if more of other owners of RX or SX TT's share their observations and experience regarding this problem...  attached is one more video of other RX5000 for sale and it looks even worse, the need of medicine for sea sickness is infallible: http://www.youtube.com/watch?v=0z5slGdeivs
02-05-2014 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 10,160
Joined on 05-28-2004
Post #: 6
Post ID: 20541
Reply to: 20540
I never thought it would be possible.
fiogf49gjkf0d
 wonderworld wrote:
It seems that all of much used Micro RX or SX TT's have the same problem, is that right? It will be nice if more of other owners of RX or SX TT's share their observations and experience regarding this problem... attached is one more video of other RX5000 for sale and it looks even worse, the need of medicine for sea sickness is infallible

Wonderworld, you have opened a whole new word to me. I never saw a TT that does such a thing. The bearing can’t wobble so much. The bearing is a cylinder of 4-5 inch, it certainly cannot wobble. If it is air suspension then wobble is 12” sheet of glass – it can’t wobble like this. The only think that I would propose is that the platter might not be Micro made platter but was made at some kind of bogus sweatshop where they made variable platter high, making platter imbalanced. I very much doubt that somebody would make the platters so badly. I do stay with proposal that it is optical illusion some kind.

To comfort yourself your need to take one of the test records that has a continuing pitch, let say 440Ha. Some of them do have it. Play it on that wobbling TT and hear if the pitch will fluctuate. Alternately you can put 4 identical small mirrors on the platter. Reflect a fixed laser pointer to a wall from one of the mirror. Mark the reflection spot on the opposite wall. Then rotate the platter: the other 3 mirrors shall mark the very same spot on the wall.


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
02-05-2014 Post does not mapped to Knowledge Tree
Paul S
San Diego, California, USA
Posts 2,658
Joined on 10-12-2006
Post #: 7
Post ID: 20542
Reply to: 20540
Bearing/Shaft vs. Platter
fiogf49gjkf0d
The bearing might be fine and one would see up-and-down at the platter rim if the (sub-)platter was not a constant, perfect 90 degrees relative to the bearing shaft, through the 360 degrees of rotation. Many ways misalignment might happen, only a few ways to make it right again. Not a DIY repair, I suspect.


Paul S
11-13-2014 Post does not mapped to Knowledge Tree
wonderworld
Posts 11
Joined on 01-31-2014
Post #: 8
Post ID: 21331
Reply to: 20541
How many turns do the good bearing...
fiogf49gjkf0d
A few months ago I have bought almost new RX5000 from US and I am happy with it... somebody told me an idea to mark the platter and to count how many turns it will do from 33 r.p.m. until completely stops and I have counted about 30 to 32 full turns until completely stops. I think this is one of the ways to check how good is the bearing.

Now I am a guest of a seller who sell his SX 8000 I (note that is the first 8000 version) and I did the same procedure: I have pasted a small white piece of paper on its platter and the full turns was only 12 from 33 r.p.m. until the 8000I platter completely stopped to turn. 

Romy and other guys who have 8000I model,  I would like to ask you to do the same experiment and to count and tell me how many turns will do your 8000I TT's platters from 33 r.p.m. until they completely stop?

Thank you in advance!    
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