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diff --git a/docs/skew_correction.md b/docs/skew_correction.md new file mode 100644 index 00000000..f6b7822e --- /dev/null +++ b/docs/skew_correction.md @@ -0,0 +1,52 @@ +Software based skew correction can help resolve dimensional inaccuracies +resulting from a printer assembly that is not perfectly square. Note +that if your printer is significantly skewed it is strongy recommended to +first use mechanical means to get your printer as square as possible prior +to applying software based correction. + +# Print a Calibration Object +The first step in correcting skew is to print a +[calibration object](https://www.thingiverse.com/thing:2563185/files) +along the plane you want to correct. There is also a +[calibration object](https://www.thingiverse.com/thing:2972743) +that includes all planes in one model. You want the object oriented +so that corner A is toward the origin of the plane. + +Make sure that the [skew_correction] module is not enabled in printer.cfg +prior to printing the calibration part. + +# Take your measurements +The [skew_correcton] module requires 3 measurements for each plane you want +to correct; the length from Corner A to Corner C, the length from Corner B +to Corner D, and the length from corner A to corner D. When measuring length +AD do not include the flats on the corners that some test objects provide. + + + +# Update printer.cfg +Enter your lengths for the calibration print corresponding to the correct +plane under the [skew_correction] section in printer.cfg, for example: +``` +[skew_correction] +xy_ac_length: 140.4 +xy_bd_length: 142.8 +xy_ad_length: 99.8 +``` +Restart your printer. If desired, you can reprint the calibration part +with skew correction enabled. The following gcode can be used to calculate +skew of a single plane and output the results: + +``` +CALC_MEASURED_SKEW AC=<ac_length> BD=<bd_length> AD=<ad_length> +``` + +# Caveats + +When using the [skew_correction] module it is suggested to home all axes +before attempting a move. Homing a single axis to move could result in a +correction along the x and/or y axis, potentially leading to a homing error. + +It is also important to keep in mind that it is possible for [skew_correction] +to generate a correction that moves the tool beyond the printer's boundries +on the X and/or Y axes. It is recommended to arrange parts away from the +edges when using [skew_correction]. |