out trusty router has an ancient greenish Perske 3HP spindle head. It's 3 phase, 360Hz, 230 volt, 8 amp, via a variable freq. speed controller. The chuck/collets go up to 1/2", and are a V50-60 style from memory.
The bearings were apparently replaced a circa 2005 with ceramic bearings that suit a truck alternator, or so I was told.
Anyhow they're starting to sound a bit noisy and when you stop the router, the spindle stops quickly, instead of coasting to an eventual stop.
I think it's time to replace the bearings. We don't live near any possible technicians, so will have to resort to doing it ourselves.
My queries are-before we dissect it-does anyone know of which bearing sizes we'd need and whether they're readily avaiilable anywhere,
and secondly any tips on removing them?
Just for the record...the bearings are not sealed, they're an open case, and they're not lubricated-they just have an anticorrosion coating that has to be cleaned off just before installation.
Then you have to find the right grease-a no-melt high temp, high speed stuff, and use about 15% or fill about 1/6 of the case with it. That is all. Any more and you'll impede its ability to spin at 20 000 rpm without getting hot.
Hope that helps someone in the future!
(P.S. I find it interesting that no one else has mentioned replacing bearings on a Perske spindle on this forum before...)
Finding these has been quite a challenge and I've learned that the cage and the clearance+precision affect the possible RPM. Steel cages are the cheapest but will overheat at high rpm. The cage in the 6006 is a phenolic resin and design is of high precision allowing the 21k rpm.
Some of the bearing numbers I believe to be compatible (but can't guarantee performance just yet) are;
The two bearing numbers I got from Perske themselves are;
6006 2Z T9H P53
6203 2RZ T9H P63
Sorry for the delayed reply, Carllance.
The bearings we ordered through a local bearing company (NKF or CBC or something)
They cost about $245 and $99, in ceramic, for the 2 different sizes.
My son changed them over, and didn't make any comments to me about difficulty etc. He 'just did it'
We do have bearing pullers here - I don't know if he used them or not.
Well, the little top bearing would not have been hard anyhow, it's like a little one that sits in the middle of a clutch in a car on the back end of the crankshaft.