I am posting a link to a Youtube Video describing Chipload and how to get the most out of your bits. This is probably the best description I have ever seen so far for those of us that are new to CNC. I love the machines but there is no way your going to run at 100inch a minute on them so this fellow really helps to find the sweet spot. I hope this helps. Randy
Last week I was doing about 70 inch a minute on my belt drive OX, 2mm 1flute bit at 18000 rpm in MDF. 100"/min is not impossible, I do that when cutting insulation foam.
I run at 2500mm/min (100 ipm) on wood and plastics all the time. With a ball nose I am doing about twice that fast.
You need to know your microstepping, belt pitch, pulley size, etc... RepRap Calculator - Prusa Printers Mathematical formula here: gnea/grbl
My guess is that the documentation for the drivers will tell you how to set the DIP switches for microstepping. without the actual drive (google shows me about 3 different models of TB6600 driver) and the documentation it is possible to figure it out by experiment. if you set steps/mm to 1 then the motor moves 1 step for every mm you tell it to move. a 200 step per rev motor at 8x microstepping will do 1600 steps for a revolution, so telling it to move 1600mm you would see it do one revolution. if you tell it to move 1600mm but it only does half a rev, then microsteps must be 16x. Generally then, steps for 1 rev / 200 = microstep setting (assuming a 200 step per rev motor, these are common, but 400 and others do exist)
