How do you get 6/10 of a step?
Posted by
John D. Guenther
on 2000-08-30 13:51:31 UTC
Ok, here is my dumb question for those that know how all this stuff
works.
If you have a stepper motor running is 1/2 step mode so that there are
400 steps per revolution attached to a 20 tpi lead screw you get 8000
steps per inch. Now supposing I want to move that axis exactly 1.0197
inches, that would appear to me to take 8157.6 steps. The question is
how do you get the 6/10 of a step? I know, that is only .000075 of an
inch, maybe I am being paranoid about precision but it seems to me
that all this can accumulate to quite a bit over many moves along the
same axis. Is it the common practice to round up or down when
calculating the number of steps to move?
Thanks
John Guenther
works.
If you have a stepper motor running is 1/2 step mode so that there are
400 steps per revolution attached to a 20 tpi lead screw you get 8000
steps per inch. Now supposing I want to move that axis exactly 1.0197
inches, that would appear to me to take 8157.6 steps. The question is
how do you get the 6/10 of a step? I know, that is only .000075 of an
inch, maybe I am being paranoid about precision but it seems to me
that all this can accumulate to quite a bit over many moves along the
same axis. Is it the common practice to round up or down when
calculating the number of steps to move?
Thanks
John Guenther