On Tue, 07 Dec 2004 09:27:00 -0800, Sean Dinh
wrote:

AFAIK, I've not seen a grinder with an universal motor.

For the same power, induction motors are cheaper. For the same
torque, or at slow speeds, brush motors are cheaper. So something
like a grinder or DC that needs minimal torque will generally be
induction.
--
Smert' spamionam