Re: Low cost 6A stepper drivers on eBay

That's exactly the kind of knowledgable information I was looking for.

I stand convinced - save up for the microsteppers.

thanks

Al

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Statman Designs, LLC"
<titanium@c...> wrote:

> Al,
>
> This is a vast over simplification of the problem. If it were just

that

> easy to set the feedrates above the resonance bands then there

would be no

> need for microstepping drives. For simple single axis moves, you

can easily

> set the stepper motor start speed above the resonance band and

never have a

> problem. For concerted moves of multiple axes you will encounter

the

> resonance band whenever one axis has to move slowly to keep in sync

with

> another axis. The feedrate sets the vector sum of all axes, but

does not do

> anything to control the feedrate of a single axis, and you will

lose steps

> with a full or half stepping drive.
>
> Daniel J. Statman, Statman Designs
> www.statmandesigns.com
> dan.statman@r...
>
>
> ----- Original Message -----
> From: "arielnh56" <3in1@r...>
> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> Sent: Thursday, December 02, 2004 6:47 PM
> Subject: [CAD_CAM_EDM_DRO] Re: Low cost 6A stepper drivers on eBay
>
>
> >
> >
> >
> > I had assumed that the microsteps/half steps were for increased
> > resolution. I stand corrected.
> >
> > The gecko microsteppers are about 5 times the price of these basic
> > drivers. While I accept that "you get what you pay for" surely

these

> > are not complete junk? I thought the resonance issues only

happened

> > at certain speeds (or load/speed combinations?). If this is the
> > case, would it be a practical approach to go with these and work
> > around the resonance issues by adjusting feed/speed until I can
> > afford the upgrade to the microsteppers?
> >
> > Al
> >