Re: [CAD_CAM_EDM_DRO] Safety -- servo vs. stepper

Why can't a person make their own dedicated circuit board to process the
feedback loop? That would take the load off the PC. With the price of
x86nn computer chips, it oughta be cheap, and easy enough to do, no??? A
little machine language on an EPROM would be the controller???...Or, is
this already done on the commercial driver boards??

RayHex

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> From: Jon Elson <elson@...>
>

<snip>

> A true servo system where the feedback loop is processed through the
> CNC computer already has to update the velocity DACs every servo cycle.
> I have a hardware (CMOS analog, even!) watchdog that can cause an
> all-hardware E-stop if the computer fails to update the velocity

controlling

> part of the interface. On the PPMC (analog servo) it is on the DACs.
> On the UPC (PWM servo) it is on the PWM generators. And, on
> the Universal stepper controller, it is on the step rate generators.