Bearings for KMG

melsdad

melsdad

Joined
Apr 3, 2008
Messages
522
Can anyone tell me what model numbers are on there bearings for there tracking wheels, and idler wheels on there KMG, or clone grinder? What are the R.P.M. ratings, what is the radial load capacity things like that.

Thanks
Brian
 
12345678910 said:
Anything with a 1/2 bore is R8-2RS

Small wheels, R6-2RS
Click to expand...

Are these numbers you are quoting specific to a certain compnay or brand?
IE Timken Bearings or some other company.

It would be nice later when I get ready to replace my bearings to have a source and refrence number to quote and get the right bearing!
 
Dixieblade57 said:
Are these numbers you are quoting specific to a certain compnay or brand?
IE Timken Bearings or some other company.

It would be nice later when I get ready to replace my bearings to have a source and reference number to quote and get the right bearing!
Click to expand...

It's not an order number tied to a specific brand

It's an industry standard nomenclature for sizes
R8-2RS Bearing dimensions: 1/2" x 1 1/8" x 5/16"

I don't know who created the standard, ANSI or ISO?

If you go to a proper bearing shop they will understand you and likely have them on the shelf as they are very common in electric motors.



2 RS means 2 rubber seals, another option is ZZ which is stainless shields

Chineze bearings in this size are about 3 or 4 $
Japanese like NSK or Nipon are more $


If you really want to spend the $ you can get ceramic balls, which may be useful in the small wheel attachments at high RPM
 
Fellhoelter said:
Rob can tell you.
Click to expand...

Already has

http://www.bladeforums.com/forums/showpost.php?p=1659975&postcount=5


Here is how I make my rollers and contact wheels:

I use two bearings with a spacer in between. The spacer fits against the inner races and allows you to mount the roller with a standard 1/2" bolt.

It is as easy as bolting the roller to your machine frame. You can see the cutaway roller for details.
I use this method for almost all of my wheels ...from 1.5" up to 10" diameters. The bearings have a slight press fit approx .0002"-.0005".

I use deep groove radial ball bearings with rubber seals. They carry an ABEC1 rating which is a general purpose Motor grade bearing.

I use the english size "R8" which has a 1/2" ID and a 1.125" OD and .312" width.

The industry standard part number is R82RS which designates and R8 bearing with 2 rubber seals.

They are available at any bearing supplier/power transmission dealer. As an alterantive you can use the ISO series such as the 6000 series which have metric dimensions instead of English dimensions.

Grab a catalogue for the sizes...there are many!

I
 
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