On 02/28/2021 10:21 PM, Feral Engineer wrote:
Hello Hive mind,
Question for the group. I have an emco pc turn 55. I've successfully gotten
everything working 100% on LCNC with the exception of one thing, the x and
z axis utilize a mechanical limit switch to latch home position, but then
each axis has a pnp proximity sensor that triggers the actual home position
on a 1 ppr encoder of sorts. I've just been using the mechanical switches,
but I'd like to try and get the proximity sensors working during the home
sequence.
Any suggestions on where to start getting this to work?
What sort of encoders do you have (if any)?
Assuming you have encoders for position feedback, do they
have an index pulse?
(I'm guessing not, as then the 1 PPR sensor would be redundant.)
If your encoder input to the computer has a place for an
index channel, connect your prox sensors to that input.
then, enable search for index in the .ini file with :
HOME_LATCH_VEL = ##
HOME_USE_INDEX = YES
Make ## a velocity where the encoder is counting less than
1000 counts/second, so the home position will be accurate to
within one encoder count. (Some harware encoder counters
may be precise at much faster rates.)
If your home switch is also a limit switch, then there is a
bit more to this, you have to set
HOME_IGNORE_LIMITS = YES and arrange a home offset so that
the final home position does not
have the shared switch still tripped.
Jon
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