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Skew calculation?

Posted by sarf2k4 
Skew calculation?
May 03, 2018 06:21AM

I've been wondering about the marlin's skew formula here:

 *  - Compute AB     : SQRT(2*AC*AC+2*BD*BD-4*AD*AD)/2
If I understand correctly, first we need to get AB computed variable, then we would use the AB again for the skew factor. I did copy the above formula directly to openscad and echo the results. It was out of marlin's acceptable range of -1 to 1. I think the result was somewhere 1.340 or something. I really forgot. While the eeprom results was way below that I think -0.004058 (just random but I think should look like this).

I'm asking here because I don't want to keep on reflashing the board if there's any skew changes.

How can I get a proper results that can be used by marlin?
Also, I think it would be great if the marlinfw.org has this calculator where we just insert the desired values.

Thank you in advance
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