Well, took QUITE a while, but I now have the Blum TC50 touch 
probe set up on my Bridgeport.
(This is the one that I had at the Wichita code fest.)  I 
now have the interface in a box mounted on the mill, and 
made a few mods to that.  When I had it in Wichita, there 
was a switch to allow the machine to move when the probe was 
not installed.  it was possible to defeat the probe safety 
and thereby break the probe tip.  Now, I have a probe on 
button and a probe off button.  When you press probe off, it 
turns the probe off and allows the machine to move.  When 
you press probe on, it turns the probe on and if the IR 
receiver is not getting a valid signal from the probe, it 
asserts motion.feed-hold to stop the machine.  If you press 
probe on when you install the probe in the spindle, it 
pretty much protects you from breaking the probe.

One little oddity I noticed was that if the probe is tripped 
when you start a jog move, LinuxCNC doesn't complain like it 
would when the probe trips DURING a jog move.  Well, that 
makes sense as if you interrupt a probe routine, you may 
need to jog off the probe.  But, it means you need to be 
careful!

Jon

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