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  1. #21
    Ger21's Avatar
    Lives in Detroit, United States. Last Activity: 2 Hours Ago Has been a member for 5-6 years. Has a total post count of 448. Received thanks 58 times, giving thanks to others 0 times. Referred 1 members to the community.
    Quote Originally Posted by Davek0974 View Post
    so had the feedrate turned up to max, it was very jerky on curves, thats what made me think.
    This is a known issue with Mach3 and Feedrate Override. It works fine when below 100%. but it can cause jerky movement when turned up a lot above 100%.
    I don't recall if there's a safe max to use, but I would keep it below 125%.
    Gerry
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  2. The Following User Says Thank You to Ger21 For This Useful Post:


  3. #22
    Excellent, i like known issues :)

    At least there is a reason.

    Thanks

  4. #23
    I ran a couple of parts earlier this week using Mach3 at 300% without noticeable jerkiness on the curves.
    Different versions have different issues, mine doesn't seem to have jerky curves above 100% feedrate, I'll check the version but it's the one most recommended for general use on the Mach3 forum,

    - Nick
    If you will not be swayed by logic or experience simply pick the idea you
    like best, but ask yourself why you sought advice in the first place and,
    for a simple life, perhaps consider not doing so in future

  5. #24
    Ger21's Avatar
    Lives in Detroit, United States. Last Activity: 2 Hours Ago Has been a member for 5-6 years. Has a total post count of 448. Received thanks 58 times, giving thanks to others 0 times. Referred 1 members to the community.
    I think that the issue is PC dependent, and doesn't affect everyone. But it is an issue, and was confirmed by Art, the author of Mach3.

    The Machsupport forum is down right now, but I'll try to find some more info when it's back up.
    Last edited by Ger21; 03-08-2016 at 01:29 PM.
    Gerry
    ______________________________________________
    UCCNC 2017 Screenset

    Mach3 2010 Screenset

    JointCAM - CAM for Woodworking Joints

  6. The Following User Says Thank You to Ger21 For This Useful Post:


  7. #25
    Neale's Avatar
    Lives in Plymouth, United Kingdom. Last Activity: 4 Hours Ago Has been a member for 4-5 years. Has a total post count of 828. Received thanks 119 times, giving thanks to others 5 times.
    Does using a external motion controller make any difference - is the jerking only when using parallel port?

  8. #26
    John S's Avatar
    Lives in Nottingham, England, United Kingdom. Last Activity: 8 Hours Ago Has been a member for 9-10 years. Has a total post count of 2,073. Received thanks 141 times, giving thanks to others 45 times. Referred 1 members to the community.
    Why do you use FRO at 300%?

    Program the feed closer and just go up to 70 or 80%.

    Most professional controllers won't allow more than 100%
    John S -

  9. #27
    This is with a motion controller, UC100

    As i said, i was only doing a dry run so speed was irrelevant, in reality I have never used FRO or SSO !

  10. #28
    Quote Originally Posted by John S View Post
    Why do you use FRO at 300%?
    I would normally adjust feed rate to the middle of the green in CAM but it was a one-off job profiling a couple of small ally plates with a new single flute cutter, I realised it could run faster once I started the job so I just wound it up until it felt right rather than going back to CAM.

    - Nick
    If you will not be swayed by logic or experience simply pick the idea you
    like best, but ask yourself why you sought advice in the first place and,
    for a simple life, perhaps consider not doing so in future

  11. #29
    Is the Mach forum having issues - i have not been able to load it since early yesterday morning???

  12. #30
    Ger21's Avatar
    Lives in Detroit, United States. Last Activity: 2 Hours Ago Has been a member for 5-6 years. Has a total post count of 448. Received thanks 58 times, giving thanks to others 0 times. Referred 1 members to the community.
    Yes, I mentioned it in my previous post.
    Gerry
    ______________________________________________
    UCCNC 2017 Screenset

    Mach3 2010 Screenset

    JointCAM - CAM for Woodworking Joints

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