Re: [CAD_CAM_EDM_DRO] Re: servo board

Kim Lux wrote:

>I'd love to have a servo drive system that still controlled the servo in
>a closed loop/step-direction fashion, but that had a USB connection to
>each controller so that they could be queried for their position.
>
>Why do I want this ? Lets say that we are operating our machine and
>something goes wrong. We press abort. Lets say it is a software
>generated abort and the controlling software immediately stops the pulse
>train. Chances are the servo drive is going to error because the servo
>can't immediately stop. With a simple step-direction system, we've just
>lost our machine position. We have to reset our machine position before
>we can resume our work.
>
>
>As far as putting the software in the control loop, I say forget it.
>Servo controllers have PID loops and that is about all most machines
>need, even when operated at high speed. One thing about having encoder
>position feedback to the computer is that it could be a great, great
>help when tuning the PID loop of the servo controller and when tuning
>the speeds and accelerations of the software.
>
>

Yes, and this is just wonderful on EMC, to use the computer to record
and graph
the servo performance. No digital storage oscilloscopes needed!

Jon