Okay, as a start, I’ve regularized the data from the official feeds and speeds and am beginning to add the calculated values at:
https://www.shapeoko.com/wiki/index.php/Materials#Shapeoko_3
If anyone sees any further typos there, or at https://www.shapeoko.com/wiki/index.php/Materials#Router_Speed_Chart — please let me know. For the router speed chart, the intermediate values are currently just interpolated directly — it would be nice to work up a math function (or chart them?) and interpolate them in some fashion which would better model the actual RPM (or would a couple of folks w/ tachometers be inclined to measure theirs with more detail than we currently have?)
Continuing this at: Tutorial on feeds and speeds