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  1. #37
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    Default Re: Zero Touch Probe problem

    Quote Originally Posted by john-100 View Post
    this is a very basic diagram to add a PC819 opto isolator to a C11G input

    Zero Touch Probe problem-adding-opto-isolator-c11g-input-jpg

    if you add a link to your 4 channel opto isolator
    I will add more details just for your opto-isolator
    some opto-isolator boards have transistors connected to the opto-isolator output transistor



    John

    PS
    a random opto-isolator PCB example

    Zero Touch Probe problem-4-ch-opto-isolator-pcb-jpg
    Ok This is what I have here:

    Zero Touch Probe problem-s-l1600-jpg

    Attached Thumbnails Attached Thumbnails Zero Touch Probe problem-s-l1600-jpg  


  2. #38
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    Default Re: Zero Touch Probe problem

    I have found this circuit diagram for your opto-isolator board
    Zero Touch Probe problem-bucck-817-4-1-jpg

    the 3K resistor connecting the opto-isolator collector to terminal V1 is higher than I would expect
    (if it was near to 300 ohms I would of connected the photo transistors emitter / output GND to the BOB's GND )

    if the resistor values on the opto-isolator are correct I would connect it to the C11G like this
    Zero Touch Probe problem-c11g-opto-isolator-jpg

    when the tool touches the touch plate
    the LED indicator will be on and the photo transistor inside the "817" opto-isolator will switch on

    This connects the BOB's +5V via the 3K resistor to the BOB's input
    the printer port pin should switch from a logic low (0V) to a logic high ( +5V)

    In Mach 3 set the input to active high


    John



  3. #39
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    Default Re: Zero Touch Probe problem

    looking closer at the photo of the PCB
    it looks like the resistors fitted are 1K (marked 102) instead of the 3K shown on the circuit diagram found on line

    Zero Touch Probe problem-revised-c11g-opto-isolator-jpg

    John



  4. #40
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    Default Re: Zero Touch Probe problem

    Quote Originally Posted by john-100 View Post
    looking closer at the photo of the PCB
    it looks like the resistors fitted are 1K (marked 102) instead of the 3K shown on the circuit diagram found on line

    Zero Touch Probe problem-revised-c11g-opto-isolator-jpg

    John
    Great information and great drawing... Thanks I will be hooking this up. I am considering hooking all the inputs to the BOB throughZero Touch Probe problem-img_20190318_192844794-jpgZero Touch Probe problem-img_20190318_192856639-jpg the Opto board just to clean things up. How much do you know about Index pulses. I built a Hall effect sensor and I am getting a reading but i am not sure its accurate. MACH3 says one speed and the Index says another.

    Attached Thumbnails Attached Thumbnails Zero Touch Probe problem-img_20190318_192844794-jpg   Zero Touch Probe problem-img_20190318_192856639-jpg  


  5. #41
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    Default 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 ?
    Zero Touch Probe problem-xmt-2360-sieg-mill-speed-control-jpg


    with the FC250J board in my mini lathe for example
    Zero Touch Probe problem-c2-182a-main-control-board-fc250j-jpg
    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



  6. #42
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    Default Re: Zero Touch Probe problem

    Quote Originally Posted by john-100 View Post
    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 ?
    Zero Touch Probe problem-xmt-2360-sieg-mill-speed-control-jpg


    with the FC250J board in my mini lathe for example
    Zero Touch Probe problem-c2-182a-main-control-board-fc250j-jpg
    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



  7. #43
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    Default 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
    Zero Touch Probe problem-c2-182a-main-control-board-fc250j-jpg
    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



  8. #44
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    Default Re: Zero Touch Probe problem

    Quote Originally Posted by john-100 View Post
    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
    Zero Touch Probe problem-c2-182a-main-control-board-fc250j-jpg
    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,,,



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