Right now this provides more than enough power to cut foam, plastic, and wood, and should be enough to cut aluminum. The A axis - the rotary bit - is driven through a worm gear, also powered by a NEMA 24. The design of the Rotomill uses a standard, off-the-shelf Makita rotary tool for the spindle, and uses leadscrews to move the X and Z axes around with NEMA 24 stepper motors. It’s the Rotomill, a simple three-axis CNC machine, with a rotary axis, that just about anyone can build. That’s exactly what and did with their project at this year’s World Maker Faire in New York. Sure, you could buy a rotary axis for a Haas or Tormach for thousands of dollars, or you could build your own. These parts - weird screws, camshafts, strange gears, or simply a shaft with a keyway (or two) - can really only be made with a rotary axis on a CNC machine. There’s a certain class of parts that just can’t be made on a standard 3-axis mill, nor with a 3D printer or a lathe.
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