Mach3 MDI DRO


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Thread: Mach3 MDI DRO

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    Default Mach3 MDI DRO

    does anyone know why when im telling to mach3 to move -y20 the dro read outs 19.991?

    i zero y before i asked it to move



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    Default Re: Mach3 MDI DRO

    Could be do to your resolution, or steps/unit setting

    Gerry

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    Default Re: Mach3 MDI DRO

    Quote Originally Posted by ger21 View Post
    Could be do to your resolution, or steps/unit setting
    im currently calibrating the machine and my digital indicator is saying its moving 20mm but the mdi is reading 19.991 so my steps per unit are correct but the dro isnt displaying the correct value.

    concerned when i machine the accuracy isnt going to be there.

    Last edited by dfox1787; 01-20-2018 at 11:14 AM.


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    Default Re: Mach3 MDI DRO

    The resolution of a machine is the smallest distance ONE step produces. That boils down to Steps per unit. You can't make a machine have more resolution that what the steps per unit are. Mach can take fractional steps per unit but it has to average them out of a distance by applying an added step here or there to get that close. To get higher resolution you either change the gearing between the motor and linear drive elements or you get a higher resolution motor (Servo with high line count encoder)
    With no information on the motors, linear drive type or any gearing its just a general answer.



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    Default Re: Mach3 MDI DRO

    Dfox1787,

    The thickness or width of a human hair is seven times larger than the inaccuracy you are worried about.

    Jeff...

    Patience and perseverance have a magical effect before which difficulties disappear and obstacles vanish.


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    Default Re: Mach3 MDI DRO

    Quote Originally Posted by jalessi View Post
    Dfox1787,

    The thickness or width of a human hair is seven times larger than the inaccuracy you are worried about.

    Jeff...
    are you saying you wouldnt worry about it. it is moving the correct distance according to my dial indicator.



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    Default Re: Mach3 MDI DRO

    Quote Originally Posted by Torchhead View Post
    The resolution of a machine is the smallest distance ONE step produces. That boils down to Steps per unit. You can't make a machine have more resolution that what the steps per unit are. Mach can take fractional steps per unit but it has to average them out of a distance by applying an added step here or there to get that close. To get higher resolution you either change the gearing between the motor and linear drive elements or you get a higher resolution motor (Servo with high line count encoder)
    With no information on the motors, linear drive type or any gearing its just a general answer.
    Hi torchhead this is a cheap china cnc 3040 machine. its driven by ballscrews and the motors are nema23 265oz 2.8a.

    i think i just need to spend more time calibrating and maybe i can get it spot on. The dial indicator is saying the axis is moving the correct distance.



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    Default Re: Mach3 MDI DRO

    Dfox1787,

    See attached link for a little more insight into what you are experiencing:

    https://en.industryarena.com/forum/mach-3-precision-question--212578.html


    Jeff...

    Patience and perseverance have a magical effect before which difficulties disappear and obstacles vanish.


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    Member jalessi's Avatar
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    Smile Re: Mach3 MDI DRO

    I have no idea what your tolerance requirements are however I myself would never worry about a .009 mm discrepancy.

    Jeff...

    Quote Originally Posted by dfox1787 View Post
    are you saying you wouldnt worry about it. it is moving the correct distance according to my dial indicator.


    Attached Thumbnails Attached Thumbnails Mach3 MDI DRO-009mm-jpg  
    Patience and perseverance have a magical effect before which difficulties disappear and obstacles vanish.


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