Re: Newbie Q, tuning for max speed

[Jon Elson <elson-at-pico-systems.com>]

Damon Gentile wrote:

>Jon, 
> I thought that MIN & MAX_OUTPUT were only used for servos ?
>
Well, I am not completely familiar with the insides of freqmod, but it 
emulates
a servo system in software.

> I'm 
>running some (puny?) 116 oz/in steppers, no feedback.
> Good insight on what happens by decreasing period, I'll really 
>try and crunch that down so there is less delta.  With 20uS, the
>PC is noticeably slower. Maybe if I kill the nescape widows...
>Step resolution is 0.0000625 (200 step motor, 1/8th step, 10TPI 
>leadscrew)
> I dont care so much for flat out speed (G00) but ability to move
>and not error out will be nice. I can typically get about 30IPM
>on any axis at a time, coordinated 2-ax moves seem a little more
>problematic. I'll try and tweak the PID and get a better grasp on
>where it falls apart. 
>  
>
Hmm, very strange.  There shouldn't be any interaction between axes. 
 Are you sure your
power supply is not drooping under load?

Jon