Re: [CAD_CAM_EDM_DRO] Son of Servo questions.

> If I plan on using a .5"/rev ball screw, a 500 count/rev encoder will give
> me a resolution of only .001" per pulse, yes?

Hi Peter,
If you only decoded 1 pulse per rev. from the encoder your calculation would
be accurate. But to be able to detect direction encoders use 2 phases (pulse
trains)
often named A and B. What actually is detected are the flanks so you get
not 1, but 4 pulses !

Lets redo you calculation now:
500 count/rev * 4 = 2.000 c/r
0.5"/rev gives 0,00025"

> likewise if I want my accuracy and repeatability to be as close to .001"

as I can afford,

> a higher encoder resolution would be preferable? Say 1000 count or higher

If, and I say if, I am not misstaken you should have 10X your desired
accuracy/ repeatability resolution on the encoder.
So for desired 0.001" your encoder res. should be 0.0001".
0.5 / X /4 = 0.0001
solve X and u get X=1250 count/rev.

Good luck!