Originally Posted by ger21 Chuck, that's .00025/ step for 1.8° with 1/4-20 screws ( 1/(20*200) ), .000125 for .9°. |
You are, of course, correct. I don't know what I was thinking when I posted that...but looking at the time I posted it, the mistake is not surprising.
And what you said about all being equal is confusing. As long as the computer can output steps fast enough for the .9° motor, if you do a G1 X5 F30, it's going to move the same speed with either one. |
How is that confusing? Given the same step rate, the same pitch screw, the same electronics, etc...the speed of rotation of the 1.8 degree stepper will be twice as fast as the speed of rotation of the .9 degree stepper.
If you double the step rate, then you're not comparing the motors.
It would be like saying that a Yugo can go faster than a Ferrari...it can, if the Ferrari is driven in a school zone during rush hour, and the Yugo is plummeting off a cliff. It's a meaningless comparison. For a comparison like this to be meaningful only the single variable should be, well, variable...all else should be equal.
-- Chuck Knight