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- Problems with touch system for x, y, z - Probe tripped during non-probe move
Problems with touch system for x, y, z - Probe tripped during non-probe move
- mitakata_net
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27 May 2022 09:29 #243973
by mitakata_net
Problems with touch system for x, y, z - Probe tripped during non-probe move was created by mitakata_net
Hello,
Some time ago, with your help, I made a very simple touch system for x, y, z, which works great. I had to change the computer that runs my CNC router and I installed the latest version of Linux - LinuxCNC 2.8.2 Debian 10 Buster PREEMPT-RT ISO. Everything is set up as before on the old computer, but now the touchoff system does not work. When starting at different stages of execution, it stops and shows an error - Probe is activated during movement without a probe
I will be happy if you tell me where to look for the problem or what other information is needed to find out where the problem may be.
Some time ago, with your help, I made a very simple touch system for x, y, z, which works great. I had to change the computer that runs my CNC router and I installed the latest version of Linux - LinuxCNC 2.8.2 Debian 10 Buster PREEMPT-RT ISO. Everything is set up as before on the old computer, but now the touchoff system does not work. When starting at different stages of execution, it stops and shows an error - Probe is activated during movement without a probe
I will be happy if you tell me where to look for the problem or what other information is needed to find out where the problem may be.
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- andypugh
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30 May 2022 00:51 #244170
by andypugh
Replied by andypugh on topic Problems with touch system for x, y, z - Probe tripped during non-probe move
It sounds like there might be electrical noise on the probe input, or possibly a mechanical vibration is triggering the probe.
Do you have any sort of software filtering on the probe input?
Do you have any sort of software filtering on the probe input?
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- mitakata_net
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30 May 2022 15:20 #244222
by mitakata_net
Replied by mitakata_net on topic Problems with touch system for x, y, z - Probe tripped during non-probe move
The system, which is quite simple,
It is a metal plate, which is connected to the ground, and the other end of the clip, which I connect to the tool and through a cable goes to 13 pins on the parallel port and in contact finds the values of x, y and z.
The cable I use is shielded, and until a month ago everything worked perfectly, more than 2 years.
It is a metal plate, which is connected to the ground, and the other end of the clip, which I connect to the tool and through a cable goes to 13 pins on the parallel port and in contact finds the values of x, y and z.
The cable I use is shielded, and until a month ago everything worked perfectly, more than 2 years.
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31 May 2022 09:15 #244268
by andypugh
Replied by andypugh on topic Problems with touch system for x, y, z - Probe tripped during non-probe move
I think that this is most likely a hardware difference between the old and new parallel ports.
(Possibly the old port was a 5V port and the new one is 3.3V)
Assuming that the touch-plate is used to pull-down the pin, try pulling it up with a resistor (1k?) at the parallel port end. This should make it a lot more noise tolerant.
(Or you could use the debounce HAL function to filter it in software. The probe input is only sampled in the servo thread, so filtering in the base thread has no timing penalty)
(Possibly the old port was a 5V port and the new one is 3.3V)
Assuming that the touch-plate is used to pull-down the pin, try pulling it up with a resistor (1k?) at the parallel port end. This should make it a lot more noise tolerant.
(Or you could use the debounce HAL function to filter it in software. The probe input is only sampled in the servo thread, so filtering in the base thread has no timing penalty)
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