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  1. #251
    OK - your reference to PWM threw me a little as you have connected up according to rawcnc link.

    This is using 0-10v analogue control on the right hand side of the BoB in the link. This may be derived on the BoB from Mach3 PWM output which is presented on the PWM terminal of the BoB from the pin 1 output of Mach3. The on/off spindle relay is used in your case. My spindle speed control is via a SuperPID device http://www.vhipe.com/product-private/index.htm as I have a Kress router on my small machine.

    The strange sound you refer to in the motors could be a result of an intermittent disconnected winding as only one coil is being energised and with the change of direction of flux it would just buzz at the speed of the driver pulses.
    Albert Einstein may have been a genius, but his brother Frank, was a monster

    Having just moved to Windows 10 (which is crap) My stress levels are through the roof !!!

  2. #252
    It may very well be as you say.
    On one job for example, it cut fine for half the work, then the z axis moved down 5mm and continued to cut a quarter of the work, then it got back up to finish the work at the same level. I was not in the workshop when it did this, but since that, I stay around the cnc for the time of the cut. Not very convenient, but hey, it gets the job done for the time being.
    It seems like tis pwm setting creates some noise now and then, as the symptoms of the problem look a lot like electrcial noise. Still, I cannot tie this noise to anything. Seems random at the moment.

    I don't know what to fix or change yet, so I'll continue to cut and take notes of future strange events, maybe I can pinpoint the cause. I'll update the post when anything new comes up.

    The strange sound, to my best ability to explain, is like the motor reduces the speed (low tone) for just a sec (when it loses 5mm), but there is no speed reduction in the gcode. It seems (but I am not sure at all), that this event occurs when the z axis moves up (to safe z).

    Meanwhile, thank you. :)

  3. #253
    Here is a video of a phase disconnection in a running stepper.

    https://www.dropbox.com/s/add4ruae38...P0004.AVI?dl=0
    Albert Einstein may have been a genius, but his brother Frank, was a monster

    Having just moved to Windows 10 (which is crap) My stress levels are through the roof !!!

  4. #254
    Thank you for taking the time to do the video.
    The sound is very harsh and different from what happens in my case, but I'll check all conection again anyway. Also keep in mind the driver option.
    I will try to capture a video with the events for further explanation.

    Have a nice weekend. :)

  5. #255
    Quote Originally Posted by Radu_Andrei View Post
    Thank you for taking the time to do the video.
    The sound is very harsh and different from what happens in my case, but I'll check all conection again anyway. Also keep in mind the driver option.
    I will try to capture a video with the events for further explanation.

    Have a nice weekend. :)
    The harsh sound is because it was bouncing on the desk.
    Albert Einstein may have been a genius, but his brother Frank, was a monster

    Having just moved to Windows 10 (which is crap) My stress levels are through the roof !!!

  6. #256
    Ok. :)

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