I'm working on my own THC design as I get time. It's just a basic type that sends out THC UP & THC DOWN signals, no fast PID or anything (yet
![Twisted Evil :twisted:](./images/smilies/icon_twisted.gif)
Do you have any recommendations for what rate I need to be able to send out the up/down signals. I mean with electronics and microcontrollers I could send them out 500 times per second, or much greater, but a mechanical Z-axis simply cannot take advantage of that speed.
Do you think 30 per second is too slow. That would THEORETICALLY mean you could send out a THC UP signal and the Z starts moving up. 1/30th of a second later you send out a THC DOWN signal and the Z must reverse direction and starts going down. In one second that UP/DOWN movement could be repeated 15 times, and the Z must be CAPABLE of mechanically doing it.
So basically I'm wondering, physically, how fast a well made Z axis can react and thus how many THC UP/DOWNS per second should I design for. Or put another way, what rate would be needed for good THC control.
I'm sure there's a lot of completely un-necessary THC specifications out there claiming super fine volts resolution, and super fast correction outputs, yet for all practical purposes they don't make any difference above certain PRACTICAL values because the limitations are more mechanical, such as rigidity, inertia, etc.
Cheers,
Keith.