[Frode1]

Im in the progress of swapping bearings on my perske spindle on multicam MT22.
They use SKF bearings standard with double rubber seals. I was thinking of possibly swapping them for ceramic bearings but then i started thinking about the Z-zero tool possibly not working if i do so (aluminium block connected to pendant, are those ceramic bearings conductive at all i need them to be for the tool to work.


Frode

[Jason M]

You are correct in your feeling that the ceramic bearings will not conduct, well done spotting the danger before you purchased!

[Frode1]

Hi !

Think i found a solution after all then, ill use ceramic bearing for the main bearing (the one closest to the tool) but ill buy a high quality steel bearing for the support bearing that should give me what i need. after all its the big bearing that takes most of the load.

[Max]

a quick work around for ceramic bearings that I am using,
I attached a wire with an alligator clip on one end to a mounting screw on the z assembly
when I want to set the tool length, I clip to the bit, place the block and set the 0
pretty simple until I find something better

[Frode1]

any ideas about method of breaking new spindle bearings, i belive its not a good idea to put it to work before running it a while first ?

[Jason M]

any ideas about method of breaking new spindle bearings, i belive its not a good idea to put it to work before running it a while first ?

You're correct, we've published our spindle break-in procedure document (deals with storage as well) and an article on what happens during spindle break-in for you to check out.

To summarize those 2 documents and answer your question directly yes, new spindle bearings need a break-in (or run-in) procedure run before running in full production. The short of it: start the spindle at 10% speed and monitor temperature at the bearing housings, if at any time temperature exceeds 55-60C (131-140F) shut it down and let it cool to room temperature. Barring any temperature related cool down periods you should increase the speed at 10% increments and monitor the temperature until the spindle's maximum RPM is reached

[Frode1]

Good instructions, Thanx !

[Jason M]

Glad to help! Best of luck with your refurbished spindle