I’m in the planning stages of an MPCNC build and I’d like to understand how well it might work. I would make it small to keep it stiff, with about a 12x12x2 inch work volume, use stainless one inch by 049 wall tubing, use a BLDC spindle motor and ESTLCAM to make gcode that was optimized for accuracy (trochoidal milling with an appropriate small carbide bit), with a final pass to clean it up. One piece I need to make has a 1.3 inch hole in plastic (PVC) about 1/4 inch thick. How circular might I expect this hole to be? What should I consider to make the MPCNC as accurate as it can reasonably be?
Thanks for your input.