.01 sounds right
A cap will work. But if you use Mach3 as the controller you simply set the debounce setting (adjustable) for the exact same effect. It will filter out short pulses.
Current build: http://www.cnczone.com/forums/diy-cnc-router-table-machines/264838-new-machine-desing-quot-cnm13-quot.html
Ok, I personally would then use a schmitt trigger (have used many times for sensitive inputs, works great). The cap should also work as it won't discharge fast.
Schmitt trigger - Wikipedia, the free encyclopedia
Current build: http://www.cnczone.com/forums/diy-cnc-router-table-machines/264838-new-machine-desing-quot-cnm13-quot.html
Yeah I switched to pathpilot and a Mesa card and am happy.
Thanks for the input. I'm having similar random e-stop problems.
CJ
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Cj - actually I forgot but I was getting swarf on the y axis limit switch that would trigger an estop - even w aluminum! I covered the limit switch w a plastic cover that keeps the swarf a little off the switch and that decreased the estops
Have you tried simply putting small capacitors (0.01-0.1uF is good) on the E-Stop and Home/Limit inputs? That will filter out any noise, with no ill effect on any other aspect of performance.
The inductive limit switches ARE prone to false triggers, even when milling aluminum. Novakon has, at some point in the last year or two, re-designed the limit switch mounts to at least mitigate this problem. On the earlier machines, like mine, those switches are a problem. I removed my X/Y inductive limits very early on due to the false triggers.
Regards,
Ray L.
Ray - good point. I think you suggested I do that as well. That filter cap worked great on my grizzly cnc lathe that was throwing e-stops left and right. I put a scope on the signal and it looked like a v-tach (for those medical folks) before the cap - an afterwards a nice square wave when the input was triggered.
Ray correct me if I am wrong but depending on the input you may have to put the cap across the input and GND VS the input and V+ (depending on if it's a high/low input).
I had that problem on my Torus as well.
I just turned them off on it.
Lee
I also was plagued with random estops on my Torus pro. The problems mostly originated from the limit switches. I was also getting some from the power draw bar. As a temporary solution I disabled the limit switches in Mach 3 I only used them for homing. This got rid of most of the problem.
The final solution was to replace the VFD. It seems it was the source of the problem. I have not been running the mill a lot lately but I have not had an estop error in months. Going from memory but the original VFD was a Sunfar 550 and the replacement one is a Automation Direct GS2.