How do you Mount the Bearings on Chinese Ballscrews?

[kolias]

How do you mount the BK/BF12 bearings on the Chinese RM16 Ballscrews (see attached pic)? I do sand the shaft lightly and apply some lubricant but I find it quite difficult especially on the Y,A and X axis which are quite long. Searching I didn’t find any suitable tool.

Any tips?
Thanks

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[joeavaerage]

Hi,
those bearings should be a hand-push fit on the shaft. You may have to put the shaft in a lathe and use emery to bring it down somewhat. Don't whatever you do
allow the ballnut to come off, its a major PITA to fit it back on.

Craig.

[mactec54]

How do you mount the BK/BF12 bearings on the Chinese RM16 Ballscrews (see attached pic)? I do sand the shaft lightly and apply some lubricant but I find it quite difficult especially on the Y,A and X axis which are quite long. Searching I didn’t find any suitable tool.

Any tips?
Thanks

They should be a just slide fit, if not someone messed up with the size of the shaft machining, the support Bearing end can be a tight fit as there is no clamping of the Bearing to the shaft, so measure the Bearing mounting area with a Micrometer to get the size and post what it is.

[kolias]

Thank you guys, now I feel much better because I thought I was missing something. It’s true in the past some bearings just slide on but the majority are PITA however now I know what’s going on I will write on my order next time the shafts to be machined properly.

Craig I know about the ballnut not to remove, thanks.

mastec54 for the double bearing (the one at the left in my picture), the shaft is 0.475” and the bearing ID is 0.464”. The other end, the smaller bearing, the shaft is 0.394” and the bearing ID is 0.384”.

Many thanks

[mactec54]

Thank you guys, now I feel much better because I thought I was missing something. It’s true in the past some bearings just slide on but the majority are PITA however now I know what’s going on I will write on my order next time the shafts to be machined properly.

Craig I know about the ballnut not to remove, thanks.

mastec54 for the double bearing (the one at the left in my picture), the shaft is 0.475” and the bearing ID is 0.464”. The other end, the smaller bearing, the shaft is 0.394” and the bearing ID is 0.384”.

Many thanks

Seems you have a 10mm Bearing and a 12mm Bearing

12mm is .4724 The Bearing ID will be these sizes

10mm=.3937

Are you measuring with a micrometer or a caliper ??

[kolias]

Thanks mastec54, yes the bearing on the left side of the shaft (where the motor is installed) is a double bearing and the other end is a smaller bearing to support the shaft end.

I measure with a digital caliper

[mactec54]

Thanks mastec54, yes the bearing on the left side of the shaft (where the motor is installed) is a double bearing and the other end is a smaller bearing to support the shaft end.

I measure with a digital caliper

Yes, the Digital Caliper would not be accurate enough to measure the Bearing ID or the Ballscrew shaft, it can only give you a rough number, the Bearings will be the size I posted