Re: servo vs stepper

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Jon Elson <elson@p...> wrote:
> Stephen Wille Padnos wrote:
>
> >Oh yeah - one other thing to check with a scope - how much jitter
is
> >there in the pulse spacing?
> >
> >You're using a hardware pulse generator, so I would expect no
more than
> >100 nS or so (assuming a 10MHz clock, which seems pretty
popular). If
> >the spacing between falling edges varies too much, that would be
a
> >problem. (it's like accelerating and decelerating rapidly).
> >
> >
> Yes, I've been urging Keith to do a "headphone test", where you
hook the
> step pulse source to a set of walkman headphones with a series
resistor
> to limit current. If the step pulse spacing is irregular, it
sounds
> like buzzing
> bees. If the pulses are very regular, it sounds like a slide
whistle.
> This is how I check settings for my universal stepper controller.
If the
> tuning parameers are not right, the buzzing bees can be obtained.
When
> I get the clean whistle, I know that is the magic combination of
numbers.
>
> Jon