Hi Ian..The Gearing for the Z-stepper Motor gives Torque:
1200 Oz-in Bipolar Mode, I am using it in Unipolar so Lets say I am getting 600Oz-in Torque straight away from the Motor..
Now , 600 x 3 =1800Oz-in torque at the Feed shaft.. So do you feel good at this Torque for drilling hole in 30mm thick Carbon Steel Plate...
Following were my setting for Z-axis Motors
Steps/Unit= 12.33 , Velocity=10mm/min and Acceleration=5mm/min/min
200 steps, 1/2 step Mode, 3:1 Reduction Pully and further Rack/Pinion..
The Brand New HSS 2flute drill 7.8mm DORMER, Following were the Feed and speed
Spindle RPM= 900
Plunge feed= 41.072 mm/min
Engage feed =15.402 mm/min
Cut Feed =173 mm/min
and Rapid is used as Transfer Feed
The Motor when enabled, Can't be rotated with the help of Hand Force by forcing the big Pully... I don't know How you can Pull the bus with it?
Also, I have found that when backlash is enabled in Mach3, I can't increase my IPM!!!..If I set velocity says 200 the speed i am getting like i am getting 40.. Increasing The Velocity value in Mach3 motor tunning do not affect the speed of the system:(