RE: Gecho 210 step multiplier, was Re: [CAD_CAM_EDM_DRO] Stepper Math

Paul,

I was talking about the Gecko G201, not the G210.

Your comments are true regarding the G210.
It is used to smooth out or speed-up a drive's output.

I would like Mariss to comment/explain how the 210 responds to a pulse train
that is accelerating or slowing down in frequency. It seems to me that the
pulse spacing can not be very regular until the frequency has stabilized.

Regards,
Guy


-----Original Message-----
From: Paul R. Hvidston [mailto:paul_hvidston@...]
Sent: Monday, February 25, 2002 12:34 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Gecho 210 step multiplier, was Re: [CAD_CAM_EDM_DRO] Stepper
Math


Guy,

I think there's some confusion about the Gecho210's step multiplier. The
manual says:

"The G210 has a built in STEP PULSE MULTIPLIER. This circuit puts out 1, 2,
5 or 10 pulses for every input STEP pulse."

This is the opposite from microstepping. It seems like the only use for a
step multiplier is if your system cannot spit out step pulses fast enough to
keep you happy, and or your "gearing" is way off and you need to speed it
up. To me, the multiplier feature of the 210 doesn't seem all that useful.
Am I missing something?

Regards,

Paul R. Hvidston, N6MGN
ACKSYS Engineering
Upland, CA

----- Original Message -----
From: "Guy Sirois" <guys@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Monday, February 25, 2002 2:05 PM
Subject: RE: [CAD_CAM_EDM_DRO] Stepper Math


> Yes, Sean.
>
> the drives can change the number of steps it takes for one revolution of
> the motor.
>
> The common motor is a 200 step/revolution as a base value. When it is
being
> driven by a drive that runs in "Full step mode", it will take 200 pulses
to
> make it turn one rev. This is rarely seen/used.
>
> You are most likely to encounter a drive that runs in "Half-step mode",
> meaning it will take 400 pulses to make one rev. The motor just follows
that
> and stops at every half-step instead of every full-step of its 200 steps.
>
> Likewise, there are drives that run in quarter-step, eight-step, or tenth
> step like the Gecko G201. You are now at 2000 pulses per revolution. Your
> motor runs 10 times slower than on a full-step drive but it is 10 times
more
> precise (theoretically) and most importantly, much more than 10 times
> smoother.
>
> The speed versus resolution is a compromise you have to make, but the
> smoothness factor of fractional step drives is maybe more important,
> depending on your application.
>
> Hope this helps,
> Guy
>
>