2 Attachment(s)
Re: Zero Touch Probe problem
which speed control board do you have in your mill and how did you connect it to your C11G BOB ?
does it look any thing like this ?
Attachment 421520
with the FC250J board in my mini lathe for example
Attachment 421522
its possible to connect the 3 wires that originally connected to the C11G PWM to analogue converter
to calibrate the maximum & minimum spindle speed you need to adjust the preset potentiometers that set the minimum and maximum speed using the original speed control potentiometer
non linearity in the C11G PWM to analogue DC converter will more of a problem to correct
John
Re: Zero Touch Probe problem
Quote:
Originally Posted by
john-100
which speed control board do you have in your mill and how did you connect it to your C11G BOB ?
does it look any thing like this ?
Attachment 421520
with the FC250J board in my mini lathe for example
Attachment 421522
its possible to connect the 3 wires that originally connected to the C11G PWM to analogue converter
to calibrate the maximum & minimum spindle speed you need to adjust the preset potentiometers that set the minimum and maximum speed using the original speed control potentiometer
non linearity in the C11G PWM to analogue DC converter will more of a problem to correct
John
Yes I think mine is the 250 board as well. I connected the C11G to pins 1and 2. I did put a CNC to manual switch. So I am breaking the 0-12 volt and the ground. I used a complete separate 12 volts supply.
I don't really understand what you mean about getting signal off the pot.
How can I prove if the rpm index sensor is right
Sent from my XT1635-01 using Tapatalk
Re: Zero Touch Probe problem
I am not sure why but in post 41
"its possible to connect the 3 wires that originally connected to the C11G PWM to analogue converter"
should of read -
its possible to connect the 3 wires that originally connected to the FC250 speed control potentiometer terminals P1 , P2 & P3 to the C11G PWM to analogue converter
provided the current taken by the C11G PWM to analogue converter is low enough
the speed control terminal P1 can supply the +12V to the C11G
with a FC250J / 230V board like this
Attachment 421522
or the 110V version
when the speed control potentiometer is fully anti clockwise (counter clockwise )
the DC voltage from the speed control potentiometer terminal P2 may not turn down to zero with respect to terminal P3
Also the maximum voltage when the potentiometer is fully clockwise may not be exactly 12V
as you would expect with a 12V zenner diode regulating the 12V supply !
what is the maximum and minimum speeds displayed by mach 3 and your tachometer ?
John
PS
in mach you can adjust the pulley ratio to change the speed mach 3 displays without changing the actual motor speed
Re: Zero Touch Probe problem
Quote:
Originally Posted by
john-100
I am not sure why but in post 41
"its possible to connect the 3 wires that originally connected to the C11G PWM to analogue converter"
should of read -
its possible to connect the 3 wires that originally connected to the FC250 speed control potentiometer terminals P1 , P2 & P3 to the C11G PWM to analogue converter
provided the current taken by the C11G PWM to analogue converter is low enough
the speed control terminal P1 can supply the +12V to the C11G
with a FC250J / 230V board like this
https://www.cnczone.com/forums/attac...d=421522&stc=1
or the 110V version
when the speed control potentiometer is fully anti clockwise (counter clockwise )
the DC voltage from the speed control potentiometer terminal P2 may not turn down to zero with respect to terminal P3
Also the maximum voltage when the potentiometer is fully clockwise may not be exactly 12V
as you would expect with a 12V zenner diode regulating the 12V supply !
what is the maximum and minimum speeds displayed by mach 3 and your tachometer ?
John
PS
in mach you can adjust the pulley ratio to change the speed mach 3 displays without changing the actual motor speed
I have the Little Machine Shop beltdrive installed maybe my ratio is off,,,