1. Good day all.

    I have not long ago upgraded my cnc pc, but ever since I am having nothing but problems with the stepper motors stalling.

    Here are the details for my current cnc pc:
    Intel Pentium 4 (640 Prescott) @ 3.2Ghz.
    FoxConn NF4SLI7AA-8KRS2.
    2GB (2x1GB) DDR2.
    nVidia nForce 210.
    60GB IDE Seagate.
    Moschip MCS9865IV-AA Dual LPT Card.
    Windows 7 Home Premium 32Bit SP1.

    As per the title I think that my problem is related to spikes in the DPC (Deferred Procedure Call).

    I have run the Mach3 driver test as this shows no problems or spikes.

    But when I have Mach3 running and run any of the axis I will get ramdom stalls, and if I run more then one axis at a time they will stall at the same time.

    I downloaded a DPC Latency Checker, and I could see that eveytime that the motors stall, there was a spike in the DPC.

    This cnc computer, has had a clean install of Windows 7 Home Premium 32Bit SP1, and the only other programs that are installed are Mach3, and CamBam.

    Can anyone here give any advice?

    Thanks for your time.

    Best Regards.
    "If first you don't succeed, redefine success"

  2. #2
    Can you try windows XP?

    Also what kernel frequency?

  3. I am using 25Khz kernel, but have tried a few other speeds but get the same.

    The old system that I have just upgraded from was also running Windows 7 Home Premium 32Bit SP1, I did not have any motor stalling problem, just that the system was very slow at booting and loading programs.

    I can try installing windows xp on a spare hard drive if I can find my old windows xp install cd.

    I don't think this problem is a OS / Software related problem, I think it's a hardware issue with the motherboard it's self.

    But anything is worth a try.

    Best Regards.
    "If first you don't succeed, redefine success"

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