Re: [CAD_CAM_EDM_DRO] Re: CNC Controler Software

volitan712003 wrote:

>--- In CAD_CAM_EDM_DRO@yahoogroups.com, Jon Elson <elson@p...> wrote:
>
>
>>With my Universal Stepper Controller, for instance, I can go up to
>>300,000 steps
>>per second, and the granularity is always 100 nS. Even at the
>>
>>
>maximum
>
>
>>rate, the
>>change in rate is still only a 3% jump.
>>
>>
>>Jon
>>
>>
>
>
>I've been meaning to ask you about this. If my computer can put out
>25khz worth of pulses, and your USC can put out 300khz - wouldn't the
>USC just end up waiting for the computer to catch up anyway?
>
>

No. The computer tells the USC how fast to put out the pulses, and then
checks
1000 times a second to see where the position counter says it is, and
compares that
to where it should be (actual vs. commanded position). It then sends a
corrected
velocity to the USC.

>Or does it take a pulse, and chop it up into faster/finer pulses
>allowing me to use a finer resolution for the same end speed (machine
>table speed) with the pulleys?
>
>

No, it doesn't work with pulses at all. It works like a servo system,
with a motor
that runs at a controlled velocity, and a position counter that reports
exact
position. If you have encoders on the machine, it can count signals
from them,
otherwise it counts the step pulses going out.

Jon