Does any body know if there is any manufacturer who make smallest bearing at 10-12mm height
I am looking for it for long time for my design but no luck.
Preferably the outer diameter of the bearing is some where near 8 mm.

Direction of Movement: Rotational at 20000 RPM Max
Load: 100gram only ( small load)

 

Small bearings are used in little electric motors (like Maxon Motors - and these motors get up to speeds of 10000 to 15000rpm) - so you are not asking for the impossible.
See links below of bearings that will do your job:-

http://www.smbbearings.com/smbnew/chrome-metric-miniatures.html
http://www.smbbearings.com/smbnew/bearingpdfs/MR84ZZ.pdf

Hope this is of help.

 

The Bearing 8- 10mm Outer Diameter with height = 10-12 mm --- rather a tall & narrow

Dear Lochnagar,

Thank you for your reply.
But the bearing is rather a tall bearing.
I can see most tall bearing are for linear movement rather than for rotation.

Thank you,

Tony Chun Tung Siu

 

Hi Tony,

why don't you consider to use self lubricating bushings?

http://glyco.de/en/home/index.htm

I suppose you have to deal with low forces

 

Hi Pier,

I had a quick look through the website you posted a link too - and as far as I can see the maximum surface speed is between 2 and 2.5m/s. To achieve that surface speed limitation - would imply a maximum diameter of 1.9 to 2.4mm.

It is an interesting link though - because that is a high surface speed for a dry bush.

 

What you want is a needle roller bearing, in some configurations called a "drawn cup bearing".

 

You are right!

I thought it was 2000 rpm....now i see it is 20.000 rpm

With this surface speed the bushings are not so suitable...but you can ask to the manufacturer for special high speed bushings.