Re: General Question REgarding Stepper vs. Servos

Daniel,

Let me preface this by saying I'm not an expert and basically going
off of what I'm learning here.

I believe I want closed loop. Stepper or servo not an issue I don't
think as far as accomplishing the cut. I want closed loop since I
want to run off of DOS emulators and not true DOS of the higher O/S,
therefore I am less worried about any missed steps creating a
possible tolerance stack in a long routine.

Charles

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

> I often hear a lot about the limitations of stepper motor systems

being the

> potential for lost steps and the resonance issues at low speed. I

have a

> question for those of you running stepper motor CNC machines: do

any of you

> actually miss and steps? My systems have been up and running

many, many

> hours and have never missed a step. With a micro-stepping drive

like

> Xylotex (for small machines) or Gecko (for larger machines) isn't

the

> resonance issue resolved? I have zero low-speed resonance on my

sytems with

> the Xylotex drives.
>
> I think the fact that steppers lose torque at high-speed is the

only

> limitation that seems to matter. Therefore, a stepper system will

be

> somewhat slower than a servo system. Or am I missing something

else?

>
> Not trying to start a religious war about stepper and servo

systems, just

> trying to understand the real differences.
>
> Daniel J. Statman, Statman Designs
> www.statmandesigns.com
> dan.statman@r...