EMC and stepper driver

I have stolen the following post from a emc message site.

http://www.nist.gov/itl/div896/emaildir/emc/msg01620.html

It is from our very own Tim Goldstein, and deals with Steppers and
servos under EMC. acording to Tim the G320 servo drive runs great at
30,000 steps per second and steppers with a stepper drive cant run
any way near this fast.

My question is. Is the front end of the G320 somehow conditioning
the signal or are servos just more forgiving. If the G320 is
conditioning the signal then we should ask Mariss at geckodrive to
put this conditioning in his line of stepper controllers.

Wally K.

*********orignal message as follows************

I will put a little different spin on this. I was running steppers
with EMC and I have now converted to servos that are driven with step
and direction signals just as if they were servos. What I have found
is that EMC can put out as high a pulse rate as I need. The limit I
am running into for maximum rapid moves is the maximum RPM the motors
are capable of. Currently I am having EMC output 30,000 steps a
second per axis and it is having no problem at all with this rate
(gives me 180 ipm). With stepper motors I was not at all able to
achieve these feed rates. I think the reason is the step and
direction servos continue to function just fine as the pulse rates
jump from mode to mode where as the stepper will stall out.

If you want to take a look at the step and direction servos go to
www.geckodrive.com and look at the G320. I agree with Jon that a
traditional servo better capability at extremely low move rates, but
I have found the step and direction servos to be a vast improvement
over steppers as a cost well below a traditional servo setup. Heck,
you can buy 8 of the drivers for just the price of the Servo to Go
card!