Re: [CAD_CAM_EDM_DRO] What ratio to use for stepper motor drive?

In a message dated 04/25/2000 5:00:09 PM Hawaiian Standard Time,
JanRwl@... writes:

<< Bryan: It may still be April, but the first is long-gone! You seem to
have
things backwards in your mind! You would put a SMALLER pulley on the motor,
and this would give you more torque. It would ALSO give you MORE
(unneeded!)
resolution!

Lotsa luck! Jan Rowland

>>

At first, it would seem a smaller pulley would increase torque. However, in
my experience, stepper motor torque drops off rapidly with rising RPMs. In
fact, I think they may fall faster than an increased pulley ratio can
compensate for. Nothing to do but try various ratios and test for maximum
rapid rates. Seems to me that micro stepping can do more harm than good for
torque. You may try a smaller pulley with half or quarter step rather than (I
presume) the current fifth step. Raising motor voltage to the max your
controller allows would be a very beneficial also. IMHO

Peter
THRD, Inc.