Re: [CAD_CAM_EDM_DRO] Re: Loosing position and need help...

Stephen Wille Padnos <spadnos@...> wrote:

R Rogers wrote:

[snip]

>Encoder resolution? The G320 has a max pulse rate of 250 quadrature. Any resolution above 1000 CPR would require the G340 with step multiplier.
>

This isn't quite right.

The G320 and the G340 have the same internal limitation of 250KHz
(250,000 counts per second). Note that that's per second, not per
minute - this is 15 million pulses per minute. A 1000-CPR (4000 PPR in
quadrature) encoder can spin at 3750 RPM before you hit that speed limit.

///I originally had 1000 CPR encoders (4000 PPR) and was told by a very reliable source that their resolution was too high and would need the 340 instead and should stay below 250 quadrature for the 320. Thats what I remember but that may have been said due to the software being only capable of 45,000 Hz. pulse rate.

//////

The pulse multiplier doesn't increase the maximum rate that can be
achieved, it reduces the step rate necessary to achieve a particular
speed. That allows software based step generators (EMC, Mach2, Ah-Ha,
etc) to get faster speeds with their limited step output rates.
Something like Jon Elson's USC can output 300K step pulses per second,
so that wouldn't require a G340 even at full speed.

- Steve

[rest of thread snipped]


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