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I have not compared to the calc values. It is pretty clear how fast and deep I need to go after a few test cuts. I aim to cut at about 15mm/s and adjust the spindle and depth to match that. Most of those calcs are for extremely large cast iron machines so any numbers you get off that always assume the shallowest, slowest, lowest load. a half inch bit would be very large for this machine, I would stick with 1/4″ or less I use 1/8″ and 1/16″, I do not even own any 1/4″..