My improved Probe Circuit
Posted: Thu Jul 10, 2014 7:09 am
Hello Forum,
I have made an improved probe sense circuit..
It is vary simple,
I use a piece of microphone coax cable as the probe lead (nice and flexible) and energize it using 250 ohm resistor from V+, At the probe i have another 250 ohm resister from the center conductor to screen (earth).
Then i look at the voltage,back at the coax side of the start resister , if it is 1/2v+ all good, Less than 1/3v+ probe is touching , greater than 2/3v+ there is wiring or connection issue so Estop the mill.
Mach3 can do some strange things if the probe is touching when the probe is called like "ignore the probe and smash the tool"
I did this because i had some issues of false probing caused by interference and i also had my probe not connect once smashing my $100 milling cutter, I never found why it did it so i went about fixing so it would not happen again.
If any one wants the circuit or board then i will name the parts and make all the values correct for release.
Kind Regards
David
I have made an improved probe sense circuit..
It is vary simple,
I use a piece of microphone coax cable as the probe lead (nice and flexible) and energize it using 250 ohm resistor from V+, At the probe i have another 250 ohm resister from the center conductor to screen (earth).
Then i look at the voltage,back at the coax side of the start resister , if it is 1/2v+ all good, Less than 1/3v+ probe is touching , greater than 2/3v+ there is wiring or connection issue so Estop the mill.
Mach3 can do some strange things if the probe is touching when the probe is called like "ignore the probe and smash the tool"
I did this because i had some issues of false probing caused by interference and i also had my probe not connect once smashing my $100 milling cutter, I never found why it did it so i went about fixing so it would not happen again.
If any one wants the circuit or board then i will name the parts and make all the values correct for release.
Kind Regards
David