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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.
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Good one, rgsparber.:bow:
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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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<a href="/cnc-error-correction-technique"><img src="/uploads/115542/cnc-error-correction-technique.jpeg" alt="CNC Error Correction Technique" /></a> </div>
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<a href="/cnc-error-correction-technique">CNC Error Correction Technique</a> <span> by <a href="/builder/Rick+Sparber">Rick Sparber</a></span> </div>
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<a href="/tag/cnc">CNC</a>, <a href="/tag/mill">mill</a>, <a href="/tag/software">software</a> </div>
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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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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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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