So spindle max. velocity and pulleys max. velocity need to be same, to get reasonable steps/rev for spindle even if ratio=1. Ok.
I read carefully the manual at pulleys, and section 5.5.5.3 refers to motor tuning velocity of spindle: "The Vel box should be set to the number of revs per second at full speed. For example, a 3600 rpm
motor would need to be set to 60.". So, in that case the ".. per min" text at motor tuning dialog is really confusing, if it is mm/min for axis motors, and rev/s for spindle motor..
Does this mean I really should put 3000rpm = 50 rev/s to motor tuning velocity, and 3000rpm to pulley dialog max speed?
This is a really good discussion! That might have caused havoc. I'm surprised it worked as well as it worked, by chance.