Ian,
I am using the basic output from HAL via a 1284 parallel printer port,
(mode 2). The stepper motor drivers are just doing the chopping to limit
current. I didn't change HAL in any way.
The one thing you might try is to limit the acceleration.
I was surprised when I raised the motor voltage and started missing steps.
That was not at all what I expected. I am driving a 2.5mm pitch lead screw
with 1.8 degree steppers (NEMA 14)
Jim Combs
Lexington, Ky
"Ian W. Wright"
<[EMAIL PROTECTED]
ex.com> To
Sent by: emc-users@lists.sourceforge.net
emc-users-bounces cc
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e.net Subject
Re: [Emc-users] Stepper speed
03/07/2008 12:23
PM
Please respond to
"Enhanced Machine
Controller (EMC)"
<[EMAIL PROTECTED]
sourceforge.net>
Thanks Jim,
>>>>>>>>>>>>I then switched to a simple chopping driver with no
micro-steps, and let HAL do the work. HAL was
capable of driving steps well up into the 50 microsecond range. >>>>>>>>>>
Do you mean here that you used the basic output from EMC2 or that you
programmed in an extra layer? I didn't find much difference in maximum
speed between the microstepping and full stepping - perhaps the stepper
motor's own inertia is also limiting the speed...
--
Best wishes,
Ian
____________
Ian W. Wright
Sheffield UK
"The difference between theory and practice is much smaller in theory than
in practice..."
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