Re: stepper pulse rate idea

[Ray Henry <rehenry-at-up.net>]

Thanks for the quick response, Tim.  Your vote counts.

I'm pretty much in agreement that you do not get benefit with steppers 
because accuracy and torque go away if you try to do much with microstepping 
or with high speed.  It might also be a worthless idea for real servo systems 
because you can count to more than a million pulses per second on even humble 
encoder cards.

Where I was thinking the application might be of real value is with step and 
direction driven servos where the torque doesn't fall off until about 6k rpm 
and you do not loose steps.  

Ray




On Thursday 13 March 2003 06:51 pm, Tim wrote:
> > 3 - c  Ray needs to reduce his caffeine intake?
>
> This one gets my vote.
>
> How many machines would it actually help considering the hardware and
> software work required? Most of the machines that I am aware of
> requiring a higher pulse rate than EMC can provide are using 20 TPI
> screws direct drive on 10 micro step drives. These applications would be
> much better served just lowering the step increment. The other machines
> where it is likely to be applied probably will not see much benefit as
> the steppers are already marginal at the rpm. Doesn't matter if the
> pulse train is multiplied or not, they will just not go a whole lot
> faster on a reliable basis.
>
> Tim
> [Denver, CO]
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