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Thread: Mach3's Screw Mapping

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    Supporting Member rgsparber's Avatar
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    rgsparber's Tools

    Mach3's Screw Mapping

    This article explains how to use Mach3's Screw Mapping feature to reduce error on the Z axis of my RF-30 mill/drill. I have to admit, this adventure sure made my head hurt! But the results make it all worthwhile.


    Screw Mapping will improve the accuracy of my RF-30 which uses a relatively sloppy gear train plus rack and pinion. Think what it can do for those with ball screws.

    If you are interested, please see:


    http://rick.sparber.org/ZSM.pdf



    Your comments are welcome. All of us are smarter than any one of us.

  2. The Following 3 Users Say Thank You to rgsparber For This Useful Post:

    Altair (04-26-2015), DIYer (04-23-2015), kbalch (04-22-2015)

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    Supporting Member Captainleeward's Avatar
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    Captainleeward's Tools
    Good one, rgsparber.

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    Supporting Member rgsparber's Avatar
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    rgsparber's Tools
    Thanks Captain!

    Rick

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    Thanks Rick! I've added your CNC Error Correction Technique to our CNC category, as well as to your builder page: Rick Sparber's Homemade Tools. Your receipt:


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    Supporting Member Paul Jones's Avatar
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    Paul Jones's Tools
    Rick,
    Excellent and methodical. Thank you for taking the time to document your processes fro handling systematic vs. random errors. I am looking forward to seeing more articles about your CNC mill.
    Paul

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    Great stuff as usual, Rick. I will have to reread your PDF to fully grasp your tutorial.

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    Supporting Member rgsparber's Avatar
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    Thanks guys. I continue to evolve the article as more is learned. Found another software bug yesterday.

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    Thanks for sharing such and educational article, Rick. As always, your contributions are invaluable. Looking forward to learning more from you!

    Al

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    Supporting Member rgsparber's Avatar
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    Al,

    Thanks! Lots more to come.

    Rick

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    I have a question regarding the Screw Mapping. Where you printed.

    "The data used by the software is limited to the nearest 0.001
    inches. In my measurements and calculations, I will carry four places to the right
    of the decimal and round to three before giving it to Mach3."

    So basically I wanted to ask the reason for rounding down to three decimal points when I can measure to four. Is this software limitation in Mach3? I have linear magnetic encoders that measure to four decimal points and have a two micron resolution.

    Mach3's screw mapping app seemed to accept the numbers I entered to four decimal points. It seems kind of a waste to round up, unless there is another reason for doing so.

    So far I have only done my Y axis which is the shortest and seems to have the most accurately cut threads. Starting over will not be a big loss of time or effort at this point.


    Thanks. amirlach

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