RE: [CAD_CAM_EDM_DRO] Servos drivers

John:

Some controllers, such as Mach2, will let you "slave" 2 axes together. In
this way, you use 2 motors, 2 Geckos, and 2 encoders, but the software knows
to move both at the same time, for the same distance.
This will allow a separate home for each, so that if they get skewed, it is
relatively simple to fix it using the software.

The A and B outputs are mainly there, as I understand it, so that you know
not only how many counts the axis moves, but in which direction. The
"quadrature" part means that the A and B counts are 90 degrees out of phase
with each other.

Andy Wander
Verrex Corporation


-----Original Message-----
From: John Heritage [mailto:john.heritage@...]
Sent: Tuesday, November 16, 2004 9:28 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] Servos drivers


Thanks Ron,

If I am driving the long axis from both sides of the table, and my servos
are only pulling 4 - 5 amps of current each, would I just use one Gecko and
tie both motors to the one amplifier. Or would I need two amplifiers, one
for each servo, and to split the step / direction inputs off to both?

Also, what does it mean when people talk about the A and B phase outputs of

the encoder? I know this has to do with one rise landing between the rise
and fall of the other phases pulse. Is this to do with how the counting is
handed over between quadrants, or is it a means of increasing the resolution

of the encoder?

Many thanks,
John

----- Original Message -----
From: "R Rogers" <rogersmach@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Tuesday, November 16, 2004 10:16 PM
Subject: Re: [CAD_CAM_EDM_DRO] Servos drivers



John,

The Gecko 320 is ample and also on sale for $99 each right now. You wont
need step multiplication if you keep the encoder counts below 250
quadrature(1000 counts per revolution of servo). The "US digital" E5S-200
encoder works perfectly with the Gecko 320.

Ron

John Heritage <john.heritage@...> wrote:

Hi,

I am looking at some servos with a peak current demand of less than 5 amps
at 30V.

I was wondering if anyone could give me some advice on which controllers to
look at. I was thinking about using Gecko 320's. What situation would I use
the pulse step multipler in?

Also, are there any other, affordable, options available?

Kind regards,
John

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