Thanks for those pin names Andy, and great point about a premature
toggle of the "No Z" button. I'm not sure what the original BP did if
you attempted to disable the No Z button while a program was running.
Given the safety features of that old BP control, I tend to think that
the button was probably disabled/ignored during program execution, but I
never tested it. Whenever I used the "No Z" feature, I ran as much of
the program as I needed for my XY sanity check, then stopped the program
and turned off No Z before rerunning the program with Z motion.
In order to get that behavior in LCNC, I would need a signal that
indicates whether or not a program is running. I did a few searches
and it looks like halui.program.is-running AND'd with halui.mode.is-auto
is potentially one solution (IOW, a program is running, and it's not an
MDI or MPG command). Sound right? Is there a better way?
Now I'm off to learn a little about AXIS and how to add a button!
Thanks,
Brent
On 8/8/2018 3:18 AM, andy pugh wrote:
On 8 August 2018 at 03:17, Brent Loschen <brent.losc...@gmail.com> wrote:
And now for my question. The old Bridgeport had a button on the front panel
titled "No Z" that turned off all z motion and let me "air mill" a part as a
sanity check of my X & Y boundaries/fixtures. I can't find the equivalent
functionality in LCNC and was wondering if anyone here has done this, or
knows the best way to implement it.
I suspect this would start off looking easy and turn out to be
surprisingly difficult.
Turning off the Z is pretty easy, you would disable the Z stepgen and
(at the same time) connect joint.2.motor-pos-fb to
joint,2,motor-pos-cmd rather than to hm2_5i25.0.stepgen.2.position-fb.
Now the machine thinks that Z is moving, so it is happy, and the
stepgen is disabled, so no steps are sent. That just needs a mux2
component in the HAL.
But what happens when you release the button? Suddenly the machine
will realise that the Z axis is not where you told it it was, and you
will get an immediate following error. Also, the Z will attempt to
move to the "real" position at a speed only limited by the stepgen
accel and velocity limits.
So you probably need some Hal-trickery to gently move the Z back in to
commanded position, while at the same time lying about the position to
prevent following error being triggered.
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