Re: [CAD_CAM_EDM_DRO] RE:Re: skate bearings

Tony Smith wrote:

>ABEC1 is rated at 30,000-40,000 RPM, I think ABEC9 are rated up around
>100,000 RPM. Basically, the higher rating have better tolerences and more
>accurate machining, meaning less run-out, vibration etc. The higher ABECs
>are for lab gear, dentist drills etc that have high RPM. For 'linear
>bearings' on a www.crankorgan.com style machine, anything will be ok. For
>a high RPM spindle, ABEC would matter.
>
>

To run rolling-element bearings at these high speeds, you pretty much need
oil-mist lubrication. These bearings would have no integral seals or
shields,
and a stream of air carrying a fine oil mist would be pumped through them.
Perske and Danly/Onsrud routers use this, for instance. The air provides
continuous cooling, and the oil assures that there is JUST enough
lubrication,
without enough to cause the fluid friction you'd get with an oil-immersed
bearing.

Jon