I have made the dumb purchase locally of a 20T pulley set and GT2 belt. Unfortunately I have to wait for 2 weeks until the new 16T pulleys arrive that I ordered tonight.
What line do I adjust to compensate for the 20T pulleys? What will the new value be please.
I assume this will be the reason I am getting 12.5mm instead of 10mm when I send 10mm command from repetier?
I assume this formula is correct?
(steps * microstepping) / (teeth * pitch)
One revolution of a 1.8° stepper is 200 steps * 16 = 3200 steps/revolution.
For GT2 (2mm) belt and a 20 tooth pulley 1 revolution = 2 * 20 = 40 mm/revolution.
3200 steps/revolution * 1 revolution/40 mm = 80 steps/mm.
this is spot on Ryan. My XY now moves exactly 10mm… However my Z is a random Nema 17 that has no info on it at all. When I move the Z up 10mm it moves at the moment 2mm. I am using an M8 threaded rod if that helps.
Ryan, A few moments ago I asked about adjusting the values for the motors on the FB group. Upon further inspection, I now realize that I am too using 20t pulleys.
With that said, because of this post I sort of know what to do. My dilemma is that my line reads differently as described above. How come mine is 200 mm and not 100 mm?
The number of steps depends on the amount of microstepping. RAMPS is usually configured for 32 steps by default, so you need 200 steps/mm. Rambo maxes out at 16th steps, so you need only 100 steps/mm. Both those numbers are for 16T pulleys.
So you’d change yours to 160, for 32nd stepping and a 20T pulley.