I perhaps have a little different perspective since we use probe moves with
plasma systems where the "probe" is the torch tip and is either ohmic sensing or
a switch mechanically activated when the torch is pressed against the metal.
2.7 does not ignore all spurious trips, because it will abort if probe is
tripped during a jog or homing. I am using a patch I made which adds two INI
settings to disable each of those behaviors, although we pretty much only ever
disable probe aborting during homing for our setups.
I do think it should be "abort" instead of e-stop on spurious trips.
I like the idea of a HAL pin to disable the behavior because I think that might
make it easier to do more complex disabling of probe aborts - such as ignoring
probe trips while homing, or restoring the 2.7 behavior where spurious probe
trips are ignored except while homing or jogging.
Moses
On 12/05/2017 03:28 PM, Sebastian Kuzminsky wrote:
<snip>
Les Newell's use case (where the "probe" is a tool length sensor permanently
mounted to the table) shows the problem with my "what's in the spindle"-centric
proposal.
I like part of Christian's proposal, where the user can configure HAL to
enable/disable the "E-stop on unexpected probe trip" behavior.
I'm also sympathetic to Jon Elson's opinion that a spurious probe trip is
essentially a misconfigured/glitchy machine, and it's the user's job to fix it
somehow (possibly using some HAL logic to control the signal that Christian
proposed).
So I propose this:
* Define a "probe trip" to be a positive edge on the motion.probe-input pin.
* A probe trip during G38 (ie, when motion.motion-type == 5) is handled just
like now.
* A probe trip at any other time causes E-stop.
* A user with a glitchy probe can restore 2.7's behavior ("ignore probe trips
when not probing") by setting up HAL logic like this:
motion.probe-input = probe-input-pin AND (motion.motion-type == 5)
In brief, this is a proposal to change the behavior from 2.7's "ignore spurious
trips" to a new "E-stop on spurious trips", and a suggestion of a simple
user-level configuration work-around to restore the old behavior by masking the
probe input. Other HAL circuitry is of course possible too, depending on what
the user wants.
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