hy hudson ... i have used load diagrams on okuma machines, in order to improve process stability, etc
the controler can display such a diagram, for example, is possible to see how spindle load evolves for 60 seconds, then the diagram is refreshed
i have also used ocr software with ping80-100ms to record axis data, including load, actual position and theoretical position; to reach a ping<1ms, you need to gather data directly from the servos ( i guess an electronist could do it )
unfortunately, i dont have experience with heidenhain is it running on windows, or other OS ?
i also don't know what an externall accelerometer is, so i also can't undersand how you wish to use it
please, what do you wish to achieve ? kindly