I reckon you should try making a DIY brushless motor spindle:

http://www.mycncuk.com/forums/showth...ors-as-spindle

http://www.mycncuk.com/forums/showth...ors-as-spindle

For PCBs with a V cutter you can use about 25mm/min per 1000rpm. So with a 24,000rpm spindle about 600mm/min. Probably a bit more but here acceleration will make a big difference. Better off with tiny milling cutters anyway....