# belt driven ball screw

Posted by TWISTED0880
 belt driven ball screw October 08, 2021 02:06AM Registered: 1 year ago Posts: 3
I just built a new corexy and im having trouble getting the steps right on my z axis i have two 1204 ball screws obviously 4mm pitch now starting with the stepper motors i have a 20 tooth gear on a nema 23 on a gt2 belt and attached to the ball screw is a 32 tooth gear im hoping one of you out there can calculate this easy i cant remember exactly but im somewhere in the ball park of 1240 steps i should mention im micro stepping 1/16
 Re: belt driven ball screw October 08, 2021 03:00AM Admin Registered: 12 years ago Posts: 6,863
ratio 32/20 = 1.6

200*16 = 3200 steps per revolution. (for a 1.8 degree stepper with 1/16 microstpping)
3200*1.6 = 5120 steps revolution (account for the ratio)
5120/4mm = 1280 steps/mm

Edited 1 time(s). Last edit at 10/08/2021 03:00AM by Dust.
 Re: belt driven ball screw October 08, 2021 03:04AM Registered: 1 year ago Posts: 3
thank you well at least i was close
 Re: belt driven ball screw October 08, 2021 03:07AM Registered: 1 year ago Posts: 3
i kept getting the ratio confused i think i was calculating it backwards
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