RE: smdromod.o COMPARED to freqmod.o

[Tim Goldstein <tgoldstein-at-mlh-services.com>]

My understanding of smdromod.o is that it is based upon freqmod.o but with
the encoder feedback being actual instead of a mirror of the step output. I
have never tried it, but my concern is that when the stepper is falling
behind sending it more steps (speeding it up) is the entirely wrong thing to
do. I thing it should scale back the feed as a feed rate override and then
add the steps back in.

Answer to your question is that it should run the same if the motor does not
lag or stall.

Tim
[Denver, CO]

> -----Original Message-----
> From: Charly Brauer [cbrauer-at-voyager.net]
> Sent: Wednesday, June 06, 2001 11:43 AM
> To: Multiple recipients of list
> Subject: smdromod.o COMPARED to freqmod.o
> 
> 
> 
> HI emc users
> 
> I'm interested in hearing what users think about the comparision of
> smdromod.o and freqmod.o?  Do the motors run better using 
> encoder feedback?
>  Is the algorithm the same as fremod(ie uses PID)?
> 
> charly  
> 
>