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  1. #1
    Dear all,

    Long story short I got hold of a great little cnc. However it also came with a problem. It's a 3-axis engraver that sits on top of a box in which all the electronics are.

    When I try to calibrate the axis from the machine's controls it makes alot of noise and does nothing. However if I move the axis individually I found that z moves fine, yet X and Y stalls when I press +/-. If want to move them at all I have to hit the +/- repetedly but it doesn't move much anyway.

    So the first thing I did was to check the motors and connections and I found that motors work great if I just use the Z controls for X or Y. I also measured the voltage going to the motors and they are all 12v.

    It does look like there is a problem with the main circuit board. Anyone out there have any ideas for tests I can do to narrow down the problem? I am starting to think that I will need buy another board.

    Cheers,
    Dan

  2. #2
    Hi Dan,

    From what you say it sounds like the X & Y are stalling.

    12v is very low and will limit your rapid speeds.

    What type of control are you using ?

    Phil

    Sent from my HTC Desire using Tapatalk

  3. #3
    I'm using the onboard controls, on the front of the machine. I don't have the software at the moment so just testing it manually.

    All motors are getting the same voltage so I assume the power supply is fine. If I switch the x or y feed to z then that motor travels Smoothly without any problems.

    On the surface it looks like there is something wrong with the x/y sockets on the control board but it does seem odd. I would have thought if there was a problem with the board then all axis would be effected or just one.

  4. #4
    Dan give more details of the control.

    Best sort out the writing first though

    Phil


    Sent from my HTC Desire using Tapatalk

  5. #5
    Quote Originally Posted by francooz View Post
    Dear all,

    Long story short I got hold of a great little cnc. However it also came with a problem. It's a 3-axis engraver that sits on top of a box in which all the electronics are.

    When I try to calibrate the axis from the machine's controls it makes alot of noise and does nothing. However if I move the axis individually I found that z moves fine, yet X and Y stalls when I press +/-. If want to move them at all I have to hit the +/- repetedly but it doesn't move much anyway.

    So the first thing I did was to check the motors and connections and I found that motors work great if I just use the Z controls for X or Y. I also measured the voltage going to the motors and they are all 12v.

    It does look like there is a problem with the main circuit board. Anyone out there have any ideas for tests I can do to narrow down the problem? I am starting to think that I will need buy another board.

    Cheers,
    Dan
    It's possible you have bad driver components on the X and Y axes, is it possible to post pictures or details of the board? A picture / more details (manufacturer / model no etc) of the whole machine may also help.

    Mark

  6. #6
    Not sure what you are getting at.

    This is an image of the dash board. Controls on the left are for the router and on the right for the axis.


  7. #7


    Not sure how well you can see everything there. I'm not at home at the moment to take another picture.

    The white box to the right is where the power coming from; straight to the motors. On the circuit xyz is from left to right.

    I will find out the model number when I get back from work.

  8. #8
    Quote Originally Posted by francooz View Post
    Not sure what you are getting at.
    There are people who read this forum with a lot of experience (I'm not one of them) and they may recognise the bit of kit and be able to suggest some tests. Looking at the picture of the board it would seem to be a fairly easy job to replace the driver ICs which would be much cheaper than getting a new board but you'd need to do more tests before knowing whether that would be a solution.

  9. #9
    Well if its an electronics problem then i will be no help whatsoever

    Phil

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  11. #10
    m_c's Avatar
    Lives in East Lothian, United Kingdom. Last Activity: 9 Hours Ago Has been a member for 9-10 years. Has a total post count of 1,832. Received thanks 192 times, giving thanks to others 5 times.
    Are you sure the stepper driver power is coming from the white box?
    The white box looks more like a VFD to me, which should be connected to the spindle control panel and spindle...

    The silver boxes look more like a PSU for the stepper drivers...

    If the motors are moving when connected to the Z-axis, then it does sound like the driver board is at fault.



    Best thing is to see if there are any model numbers on the different parts, as somebody may be able to identify them.

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