Maximum spindle speed for HF 8x12?

[saltytri]

I'm converting this machine to CNC and will use a VFD and new 3 phase motor for variable speed. There a several ways to skin that cat, resulting in a wide range of possible spindle speed ranges. I'm thinking that it would be nice to have the option of getting to around 3000 rpm, only for occasional use on small diameter parts. Can the bearings take this, with the understanding that most use will be well inside of the 2000 rpm that the stock machine maxes out at?

[Runner4404spd]

3000 will be fine. i run 4500 on mine with similar spindle bearings. just make sure you take them out and grease them with clean grease. when i disassembled mine and washed the bearings tons of grit came out.

[saltytri]

Good tip on regreasing, thanks!

Is yours CNC'd? If so, I'd appreciate your comments on what you did, why, and how.

[Freddy Warbird]

Speaking of spindles, does anyone know how to lube the main spindle bushings of the HF 8x12? There are no lube points. Are they self lubricating? Do you just squirt some 3&1 at them?

EDIT:From looking at the head stock exploded view, the main spindle appears to have ball bearings with oil rings (front, and back) covering them up, along with a tube spacer for the rear bearing. This still doesn't answer my question though. Should I simply force a little 3&1 through the oil rings? Anyone?