Hard stop when vacuum pressure loss

1

Hi everyone,

Has anyone implemented a system to trigger a hard stop on the CNC when there’s a vacuum loss on the table?

I just lost a €150 bit because a hardwood piece came loose. I’d like to add a digital pressure gauge that triggers an emergency stop if the vacuum pressure drops below -0.3 bar, for example.

I’m only running fully sealed jobs, so I rarely go below -0.5 bar (average is more like -0.7 to -0.8 bar).

I’m using CNC12.

Thanks

2

I have an air pressure sensor for the ATC that’s wired in to the ESTOP chain. I suppose you could do the same for a vacuum sensor.

(I run linuxcnc, so don’t ask for configuration details :wink:

3

Does your air pressure sensor have a built-in threshold, or is it something you configured in the software? All the pressure sensors I can find provide an analog output, so I’m not sure how to integrate that into the ESTOP chain

4

normally open, so closes when pressure is high enough, and a screw adjustment for the threshold.

Of course, you’d need a vacuum sensor, not a pressure sensor :wink:

5

Nice, I didn’t know it exists… good to know. I will look at that. Thanks