Z axsis steps/mm calculation.

In the shipping docs I got with my A101-1 it says the Z steps/mm is 756.00.

This is confirmed in the .h file in the Marlin code.

How is this number determined?

The leadscrew is 20 tpi, that’s 1.27mm per rev.

With a 200 step/rev motor that comes to 629.92 for 1/4 stepping and 1259.84 for 1/8 stepping.


Duh :confused:

Answered my own question.

The reprap calculator has 3/16-20 and I got cross eyed.

If I do the calculations with 12 as in 3/8-12 it’s correct.

Sorry to waste the bandwidth on my myopia… :neutral_face: