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