Touch Plate Issue

[SunTzu]

Hi All,

So, I've been using the original touch plate that came with my Power Route kit without issue, in fact, it still works well. However, I decided to upgrade to the Precision Zeroing Touch Plate and have yet to get it to work. My most recent test was simple, I connected the Precision Zeroing Touch Plate and when I click on Initiate Probe in UGS I immediately get an alarm. I cleared the alarm, disconnected that plate and connected the original plate, clicked on Initiate Probe, and it worked just fine. I then repeated the process two more times with the same results. 

The alert that is briefly displayed reads as follows:

An error has occured

An error was detected while sending 'G38.2 Z-10 F100': (ALARM:4) Probe fail. Probe is not in the expected initial state before starting probe cycle when G38.2 and G38.3 is not triggered and G38.4 and G38.5 is triggered. Streaming has been paused.

So, aside from the spelling error within the error message, and being rather new to this, does anyone see anything within that which might lead me to a fix? I mean, it's just two wires and I can't figure it out. 

Thanks in advance.

[VGCustomShop]

triquetra-cnc.com/
I use this one and have never had an issue.

[trifire]

Did you ever figure this out? I'm having the same problem. Thanks.

[Bruce]

Did you get this resolved? Sounds like a setting in GRBL maybe the setting for NO or NC, active high or low signal?

[hovercraft]

I believe there is a bug in the GRBL firmware (at least version 1.1 is affected). After any probing command like G38.2 and such completes, the machine still monitors the probe pin like that probing command is still in progress. You can confirm this condition seeing string like `G38.2 G21 G94 ..` in the UGS Controller State pane. At this moment, any axis movement may result in alarm condition due to the tool tip is still very close to probe surface and can produce spurious signals.

Some people report that issue may be solved by adding some capacitor in parallel with the probe, but more
general workaround may be to use command from the same modal group to lift tool off of the probe surface after every probing cycle, for example

G91 G0 Z10, where G0 belongs to the same modal group as a probing so cancels it immediately.

Also, for me using sequence of two opposite probing cycles (G38.2 - toward the surface, then G38.4 - away from the surface) and finally move away with G91 G0 Z10 produced most reliable solution.