@TQQQ laserfocusworld.com/white-papers/whitepaper/14233425/…

Then you don't have a chance to meet specs. Use Z axis fractional positioning then with microsteps but lower torque. If you have a spindle head, then use a bigger bearing.

Thus lower Z axis acceleration. Gcode Panel can do that for free.

Been there . Done that.

@W5VO i have seen many Moderation misunderstandings that are never resolved properly with 2 way communication. It's always 1 way or the highway.

@NickAlexeev if you had specs for DCR and RdsOn , and commutation frequency max for eddy current losses, one might be able to estimate for a tested Motor, otherwise, not. DC and low frequency losses are the dominant loss unless operating near max RPM with minimal load. eddy current losses are Vf^2 and not affected by current, so load ratio specs are needed.

why connecting a pull up/down resistor fix the floating pin