Gene, you mentioned settable soft limits in your last post. I have been
doing some work along these lines.
On my router the tool changer is on one end of the Y axis and a rogue
g-code file could ram the spindle into it and do a lot of damage. A
while back I messed up my tool change sequencing and it tried putting a
tool in a pocket that already had a tool in place. The machine pushed
the ATC out of the way with ease. The ATC is attached to the gantry with
a bracket made of 50x50 (2" square) steel box section, which ended up
badly twisted. It took the application of a lot of effort with a big bar
to straighten it all up again.
Anyway to try to prevent rogue code doing damage I dynamically adjust
the Y axis limits. The limits can be changed with hal pins. For example
I adjust the hal pin ini.y.max_limit, increasing the positive limit when
I need to do a tool set or tool change. That way, in normal operation it
won't let the Y axis move far enough to hit the ATC.
It should be possible to hook the limit pins to motion.analog-out-NN
pins. You can then use M67 to set the limits to whatever you want. The
only tricky bit is that the limits are in machine coordinates so you
have to do some clever trickery to convert work coords to machine
coords. On my lathe I'd like to override the tool change so it can take
the tool offsets into account when it sets the limit.
Does anyone know a good way of converting work coords to machine coords
in g-code?
Les
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