On 01/31/2018 10:18 AM, Kenneth Lerman wrote:
Jon,
I have one question I have that I haven't seen a good answer to.
Why is there a need to do a second touch? Can't you just back off at low
speed and see when the probe is no longer touching?
As far as I know, the G38.2 function in LinuxCNC does not
permit this. Also, backing off would reverse the backlash.
I guess if all probe moves only registered on the
backing-off move, then that would be consistent.
I didn't see a significant difference when I did some tests. Everyone seems
to do it the way you're doing it, but I'd like to understand if there is
any evidence that way is better.
I KNOW, by measurement, that MY PROBE has a significant
delay in reporting the trip. Renishaw-style probes may have
much more immediate response. But, my Blum TC50 probe has a
laser sensor and a microprocessor in it, and sends serial
data via an IR link. I was able to measure holes at
different speeds, and had to slow to 1 IPM before the size
measurement didn't change any more. The added time delay of
the second measurement is SO SHORT I can't even tell it is
making the second touch. So, it really doesn't slow things
down much.
Jon
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