AVR-Chat

> The problem with the current small mills is that the motors are slow
> speed, rarely over 6,000 RPM and certainly not up near 30,000 RPM
> An entire mill head is available, but the motor is over 4 pounds, I'm
> expecting my entire unit to weight less than one pound.

   I suspect you're crusing for trouble here, Dave.  There is a REASON
those mill heads weigh 4 lbs.  It has to do with rigidity.

   A 1 lb mill head is going to be too light for any but the very
lightest of cutting jobs.  You will have severe difficulty keeping your
tool correctly aligned while aking cuts, because the millhead will be
defelcting too far.  I would guess that you would even have trouble
milling copper foil off of a circuit board blank with a 1 lb mill
head,to be honest.   A 4 lb mill; head is extremely lightweight.

tom