Suggestion for a replacement bearing needed Micro DDX 1000

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stephanschmitt
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Suggestion for a replacement bearing needed Micro DDX 1000

Post by stephanschmitt » 13 Sep 2018 20:41

The motor bearing of my Micro Seiki DDX 1000 is worn and produces audible rumble. I was unable to source a new motor unit here in the US or elsewhere and consider taking the motor apart and find a source that can machine an exact copy of the existing bearing. Does anybody have experience with a shop that manufactures custom bearings?
Any other suggestion? Thanks a lot!

nat
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Re: Suggestion for a replacement bearing needed Micro DDX 10

Post by nat » 14 Sep 2018 22:49

I wonder if the guy who was producing Galiber tables is still around - he might be up for it.
This is probably a dumb question, but there isn't a ball bearing at the bottom of the spindle is there? - if so replacing it might solve the problem. Can't Help but think that you have already ruled that out, but it is worth asking before you get involved in what is likely to be an expensive process, whether you have one machined, or buy a donor table.

stephanschmitt
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Re: Suggestion for a replacement bearing needed Micro DDX 10

Post by stephanschmitt » 15 Sep 2018 13:03

Thanks nat. Indeed, there is a ball at the bottom but the sleeve and the axle shaft show signs of wear causing the rumble.

Aerobat
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Re: Suggestion for a replacement bearing needed Micro DDX 10

Post by Aerobat » 24 Sep 2018 18:57

I have one of these decks and just serviced the bearing. It wasn't making noise but as you will see it needed a new thrust pad at the bottom.

This is what the motor looks like:
https://63qgeq.by.files.1drv.com/y4mm-q ... pmode=none

These two worn-out little pads were at the bottom and the spindle rotates against them. I cleaned everything and re-lubed it with synthetic turntable oil and put a new piece of PTFE at the bottom. It now takes a much longer time to spin down. I'd definitely recommend doing this.
https://63o97g.by.files.1drv.com/y4msBs ... pmode=none

stephanschmitt
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Re: Suggestion for a replacement bearing needed Micro DDX 10

Post by stephanschmitt » 26 Sep 2018 17:48

Hello Aerobat

Interesting. Three questions:
1. where exactly are these pads located? It looks like they are
at the bottom of the shaft and the ball sits on it.
2. How did you manage to get the old pads out?
3. Where did you get the new material from?

My bearing makes audible noise which you can clearly hear with
the ear near to the platter. Not sure if the pad replacement helps? Why did
you change the pads?

Aerobat
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Re: Suggestion for a replacement bearing needed Micro DDX 10

Post by Aerobat » 26 Sep 2018 22:07

stephanschmitt wrote:Hello Aerobat

Interesting. Three questions:
1. where exactly are these pads located? It looks like they are
at the bottom of the shaft and the ball sits on it.
2. How did you manage to get the old pads out?
3. Where did you get the new material from?

My bearing makes audible noise which you can clearly hear with
the ear near to the platter. Not sure if the pad replacement helps? Why did
you change the pads?
I planned to lube mine just because of its age and I'm glad I did. Even though there is no maintenance specified for these motors nobody thought they would be running 40 years later.

Remove the cover from the bottom of the motor and the pads are in there between the spindle and the plastic bottom plate.
https://63qeeq.by.files.1drv.com/y4mSzB ... pmode=none

I would remove the whole motor and take it apart as I did, clean all surfaces with alcohol and lint-free cloth, and re-lube with synthetic oil. Take photos of the top as you disassemble it so you can figure out how it goes back together.

I ordered thin PTFE (Teflon) sheet from Amazon to make the new pads. I'll be interested in seeing the condition of yours. Hopefully once you do all this it will quiet down. I wouldn't use it until this work is done. Good luck!

https://63qdeq.by.files.1drv.com/y4mMoh ... pmode=none

stephanschmitt
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Re: Suggestion for a replacement bearing needed Micro DDX 10

Post by stephanschmitt » 27 Sep 2018 07:29

Thanks for your Help It will take me a few weeks before I can get to
it but I will post the results here

stephanschmitt
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Re: Suggestion for a replacement bearing needed Micro DDX 10

Post by stephanschmitt » 27 Sep 2018 14:45

I have one more question: How much oil did you put into the bearing shaft? Looking at the first photo you sent the spindle seems to be surrounded/covered by the oil.

Aerobat
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Re: Suggestion for a replacement bearing needed Micro DDX 10

Post by Aerobat » 27 Sep 2018 15:51

stephanschmitt wrote:I have one more question: How much oil did you put into the bearing shaft? Looking at the first photo you sent the spindle seems to be surrounded/covered by the oil.
I coated the spindle before putting it back in then filled the center of the plastic cover where the spindle rides. No need to overdo it. This is the oil I used:

https://www.amazon.com/gp/product/B0064 ... UTF8&psc=1

bimasta123
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Re: Suggestion for a replacement bearing needed Micro DDX 10

Post by bimasta123 » 07 Oct 2018 00:02

In the meantime — maybe a heavier grade oil (thicker) might Help a bit. It might fill the gaps where the wear is and reduce the "play" that's probably causing the rumble. A bit more drag on the motor, but you will sense if it's excessive, which means the experiment didn't work, so just go back to status quo ante, no harm done.

Just a thought, but easy to try — and if it works, machining new parts may be less urgent.

Also, inserting oversize bushings might Help. This is standard when retooling worn shafts in car engines, transmissions, etc. When they're retooled, the shaft's diameter decreases and oversize bushings compensates for the loss of metal.

I have the DQX-1000 so I'm familiar with the design, though nothing on mine has worn yet (only 2 years of use). Not that this info helps you in any way...

stephanschmitt
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Re: Suggestion for a replacement bearing needed Micro DDX 10

Post by stephanschmitt » 07 Oct 2018 01:08

Thank you for that idea. I tried already several different oils
without any success. I will look into the issue again over the next
couple of weeks and will get back to you.

Aerobat
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Re: Suggestion for a replacement bearing needed Micro DDX 10

Post by Aerobat » 07 Oct 2018 20:47

Bimasta have you run the wow app on your DQX? Curious about how it performs.

stephanschmitt
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Re: Suggestion for a replacement bearing needed Micro DDX 1000

Post by stephanschmitt » 23 Nov 2018 21:07

I finally managed to get back to my project. I disassembled the motor again and found that the bearing holding the top end of the spindle showed some wear marks which I found are the root cause of the noise. I polished the bearing with a Dremel and some polishing paste. I lubed the spindle and filled the bottom end of the shaft with synthetic oil as suggested. Also thanks to Mark who sent me some PTFE material for the bottom thrust pad.
After assembly and about 30 min run time the noise is gone so I hope that remedied the problem for good.
Thanks again for all the suggestions and the support.

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