Re: Servo Drive - step multiplier

Tim,

Didn't think of that one, probably because it's my least favorite.
All parallel ports can sink 16mA or more, not all can source 16mA. If
it can't, then you get increased noise suceptability and possible
miss-positioning of whatever you are running with it.

Unless you have an oscilliscope you can't tell easily if your
particular port can or can't.

Mariss

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Tim Goldstein" <timg@k...>
wrote:

> Mariss,
>
> Third reason and maybe one of the most popular. To allow ground

common

> instead of +5 common.
>
> Tim
> [Denver, CO]
> Sherline products at Deep Discount
> Mach1 & DeskCNC with credit card ordering
> www.KTMarketing.com/Sherline
>
>
> > -----Original Message-----
> > Hi,
> >
> > On a servo, the step multiplier is marginally more useful than a
> > screen door on a submarine.
> >
> > The only reasons for using it are:
> >
> > 1) You already have a high resolution encoder on a motor and a

wimpy

> > step pulse source frequency.
> >
> > 2) You want to keep the "dither" angle small but otherwise don't

need

> > a high resolution.
> >
> > Mariss