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Type: Posts; User: john-100

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  1. Re: Apparent cross-motor stepper feedback in CNC axes.

    when you hand crank an axis the stepper motor will act as a generator

    The AC currents produced will be rectified by the diodes in the two "H" bridges in the stepper driver
    the resulting DC...
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    Re: I fried limit switches inputs

    this banggood board

    425434

    will work when connecting 24V NC PNP inductive proximity switches to the
    5V Mk3/4 Planet CNC controller inputs

    you can see it has 3K9 resistors (marked 392) to...
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    Re: I fried limit switches inputs

    using the photo of the board and the HCPL data

    PlanetCNC opto-isolator module circuit

    425432

    the banggood board probably will if you get the correct version
    I'll have a look to see if I can...
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    Re: I fried limit switches inputs

    the PlanetCNC opto-isolator board has a dual opto-isolator IC that has more than the 2 LEDs and the 2 photo transistors a 2 channel version of the PC817 module from post 3

    425420 425424
    ...
  5. Re: DM542T Drivers spin only one direction, I don't understand suppliers answer...

    Great to see you have it working
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    317

    Re: 3axis and 4axis

    A USB to parallel port adaptor made for printers will not work

    Motion controllers like UC100 or Smooth stepper that emulates a printerport will

    which CNC machines have you been looking at ?
    ...
  7. Re: DM542T Drivers spin only one direction, I don't understand suppliers answer...

    If you connected the stepper driver to the printerport like this with a common +5V
    it should of worked
    As the PC port can sink more current to ground than it can source current from the ports +5V...
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    Re: Power Supply Size?

    if you use this from Geckodrive.com's web site to select your supply voltage

    see
    https://www.geckodrive.com/support/step-motor-basics/power-supply-basics.html

    32 * ?L = VMAX

    with your...
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    Re: I fried limit switches inputs

    yes that PC817 module will work

    the circuit only shows 1 of the 4 opto-isolator circuits on the board

    425142

    removing the red jumper will isolate the proximity switch 12V supply GND from...
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    Re: I fried limit switches inputs

    If I have read your post correctly

    The NC PNP inductive proximity switches will of
    pulled the Mk3/4 Planet CNC controller limit inputs up to +12V
    destroying the inputs

    The only solutions I...
  11. Replies
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    Re: 12V where 5 should be

    what is the supply voltage your using ?
    and what point on the TX1407 board have you used for the volt meters negative connection ?

    first thoughts are either the LM2576S voltage regulator on the...
  12. Re: Gerber Sabre "408": Blown Component On Board & Seeking Advise

    your photo is missing
  13. Re: CNC 3018 draws too much power with ER11A bit holder

    good to see you have it working
    it looks like the higher the inrush current due to the extra inertia was tripping the original power supply over current protection as expected

    ...
  14. Re: Safety change pump (operates by it self on a fluke) HELP!

    looking at your photo the BOB looks like this one
    425040


    if the UC100 micro controller a low power device

    the twelve 10K resistors connecting the BOB's +5V supply to the 74HC245 IC...
  15. Re: Help with an Industrial Brand CNC machine

    Pictures of the inside of the control box showing the BOB (in detail ), stepper drivers and power supplies will help

    Details of the new BOB you wish to use will also be needed

    a BOB...
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    Re: VFD control voltage

    Hi reg

    looking at your circuit again

    I have two thoughts

    1) is the ARM boards PWM output correct and follow a linear relationship with the spindle speed setting & pulse width ?
    (...
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    Re: VFD control voltage

    I was just thinking if the output of your circuit is linear between 0 to 8 V the amplifier would be a simple option

    if the GRBL board has enough processing available the software correction is...
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    Re: VFD control voltage

    I have not used GRBL but

    my initial thought is if you can adust the PWM output to give you 0 to 8 volts for the range of spindle speed you want

    then use a LM358AN op amp to amplify the DC...
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    Re: Mirrored Acrylic Charring / Burning

    your picture is missing

    John
  20. Re: Mach3 not communicating with OMNI 1212 CNC Router

    if its working OK other than the parts are too big with mach 3's default settings

    how big is the error in size ?

    you will need to set up mach 3 as in the mach 3 manual


    in mach 3

    ...
  21. Re: CNC 3018 draws too much power with ER11A bit holder

    now I can see the original CNC 3018 board
    424768
    just has on/off control of the spindle

    what happens with if you unplug the 3 stepper motors to reduce the load on the power supply ?

    if that...
  22. Re: CNC 3018 draws too much power with ER11A bit holder

    I assume your 24V supplies are switch mode power supplies

    does the CN3018 have a speed control for the spindle motor or just on/off control ?

    if it only has on/off control ,
    the higher the...
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    Re: EMI filter for 240v single phase?

    You can use the EMI filter in the US by connecting L1 to the terminal live terminal L and L2 to the neutral terminal N

    424752

    in the UK the neutral supply terminal is connected to the...
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    Re: No stepper movement.

    As the breakout board outputs consist of the NPN photo transistor in the PC817 opto-isolator and a 1K pullup resistor ( connected to +5V)

    424656

    It will be better to connect the stepper...
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    Re: CNC conversion motors won't turn

    with drivers like the KL-5056E the enable input is a negative logic input so the drive is enabled by default with no input

    link to pdf wiring diagram showing enable not connected
    ...
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