Quote Originally Posted by Boyan Silyavski View Post
3kw spindle will do the engraving, no problem. Wet of course, or sth like a mist system. Stone could be machined dry, but lower tool life and you have to have a good vacuum system and shoe.
Boyan if you are talking about the 3Kw router type spindles then they will not handle engraving Granite or Marble with industrial-grade PCD tooling. Typical RPM is between 6000-8000rpm and these spindles don't have enough low down torque. Also, they cannot handle the loads for any lengthy periods.
I built my friend a machine just for cutting the draining boards, we used one of these and killed it within 3 months. They will work ok for the occasional jobs but no good for 10hr days week in week out.