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find the high point and determine the distance from the low point — best thing to do is put some consistently thick material which will conform to the wasteboard but won’t damage the endmill — check the corners and then the center.
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That’s one way. See: Wasteboard Plans with threads and Notes on rapid positions and wasteboard leveling as noted at: https://wiki.shapeoko.com/index.php/Calibration_and_Squaring_the_Machine#Tramming
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