I'm in the process of gathering materials for my next system build and these dmm ac servos seem to be a really sweet package. I'd like to get 500ipm rapids but that is looking like a huge pipe dream after running the #s.
I'm currently using linuxcnc on my small ~4'x4' router. I'd like to stick with it if at all possible. I'm getting decent ~150ipm rapids because I've only got something like a 2k encoder on my Dc brushed servos...
I can get something like 40k pulses/second out of my PC. As I understand it there is no smooth stepper in the linux cnc world so this is going to be the limiting factor. Even with a 10mm pitch screw, I'm still only at 57IPM. an 1:8 gear results in 461IPM, but then I'm only able to move 5 thou minimum and I've probably hobbled the servo motor at that point.
Some quick numbers.. maybe I've screwed up my math... please tell me I am off
pulses/sec mm pitch pulse/rev rev/sec inch/min geared 1:2
motor:screwgeared 1:4
motor:screwgeared 1:8 resolution geared 1:2 res geared 1:4 res geared 1:8 res 25000 5
16384 1.525879 18.02219181 36.04438361 72.08876722 144.1775344 0.00030518 0.000610352 0.001220703 0.002441406 35000 5 16384 2.13623 25.23106853 50.46213706 100.9242741 201.8485482 0.00030518 0.000610352 0.001220703 0.002441406 40000 5 16384 2.441406 28.83550689 57.67101378 115.3420276 230.6840551 0.00030518 0.000610352 0.001220703 0.002441406 25000 10 16384 1.525879 36.04438361 72.08876722 144.1775344 288.3550689 0.00061035 0.001220703 0.002441406 0.004882813 35000 10 16384 2.13623 50.46213706 100.9242741 201.8485482 403.6970965 0.00061035 0.001220703 0.002441406 0.004882813 40000 10 16384 2.441406 57.67101378 115.3420276 230.6840551 461.3681102 0.00061035 0.001220703 0.002441406 0.004882813