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  1. #11
    This is two different files and the lines of g code it is stoping at doing air cuts just at a random location on the machine, the third picture is the cut I was doing yesterday when the problem first arose again
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    Last edited by charlieuk; 1 Week Ago at 01:08 PM.

  2. #12
    m_c's Avatar
    Lives in East Lothian, United Kingdom. Current Activity: Viewing Has been a member for 9-10 years. Has a total post count of 1,797. Received thanks 189 times, giving thanks to others 5 times.
    Did you re-tune the drives after swapping them?
    Avoiding the rubbish customer service from AluminiumWarehouse since July '13.

  3. #13
    No we didnít


    However we did re tune the drives after changing back to the original settings which did not make any difference.

    After that I went back to playing with the motor tuning speeds and have reduced both y and z and it has now been running for a hour or so however it does not seam quite right as it looks like it has cut some corners or not done the tool path correctly.

    How do you know how to set the speeds of each motor to get the most with out problems?
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    Last edited by charlieuk; 1 Week Ago at 07:45 PM.

  4. #14
    Mach3 has a known issue with running at higher feedrate override settings. You're better off setting the feedrate higher in the g-code and dialing down the override. Turning it up to 150% and higher can cause issues.
    Gerry
    ______________________________________________
    UCCNC 2017 Screenset

    Mach3 2010 Screenset

    JointCAM - CAM for Woodworking Joints

  5. #15
    cheers many thanks I was not aware of that.

    I have been playing with the motor tuning and have seam to stopped the fault but im not sure its set anything like optimal

  6. #16
    m_c's Avatar
    Lives in East Lothian, United Kingdom. Current Activity: Viewing Has been a member for 9-10 years. Has a total post count of 1,797. Received thanks 189 times, giving thanks to others 5 times.
    Quote Originally Posted by charlieuk View Post
    How do you know how to set the speeds of each motor to get the most with out problems?
    Keep increasing the settings until the motors start stalling, then reduce them to create a bit of a safety margin.

    You have to find a compromise between acceleration and max velocity though. With less acceleration you can ultimately get the motors to spin faster without stalling, however if you're planning on doing things that involve lots of small moves, then sacrificing top speed for acceleration, will often result in faster machining times.
    Avoiding the rubbish customer service from AluminiumWarehouse since July '13.

  7. #17
    cheers well I had a go at this today and I got them all working nice and got them all a lot faster however went to run a file and when it did some very small z moves it started tripping out again so I had to massively reduce the z back down again especially with the acc. Im wondering if maybe changing the ball screw would help so the motor was spinning a little faster and the weight of the z was overcome a little more, I think its on a 1605 at the moment.

  8. #18
    m_c's Avatar
    Lives in East Lothian, United Kingdom. Current Activity: Viewing Has been a member for 9-10 years. Has a total post count of 1,797. Received thanks 189 times, giving thanks to others 5 times.
    How are your motors driving the ball screws? Direct, or via belt?
    What kind of speeds are you getting?
    Avoiding the rubbish customer service from AluminiumWarehouse since July '13.

  9. #19
    the y and z are on belts and I have the z with 20t on the motor and 50t on the ball screw. I will have to cheque the speeds tomorrow as I went through so many I have forgot. many thanks

  10. #20
    m_c's Avatar
    Lives in East Lothian, United Kingdom. Current Activity: Viewing Has been a member for 9-10 years. Has a total post count of 1,797. Received thanks 189 times, giving thanks to others 5 times.
    You should be able to get a reasonable speed out the Z.

    For comparison, I was tuning my Triac last night, and I was getting 2.2m/min with 500mm/sec2 acceleration on the Z, and that's with an old big round stepper driving a 5mm pitch screw with 12:30 gearing via a belt. Now I doubt your Z assembly is as heavy, and you'll be using a more modern motor.
    Avoiding the rubbish customer service from AluminiumWarehouse since July '13.

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