Re: [CAD_CAM_EDM_DRO] Re: Low cost 6A stepper drivers on eBay

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@...

----- Original Message -----
From: "arielnh56" <3in1@...>
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
>