Stepper vs. servo resolution was Re: Is a reduction drive nec

Bob,

Typical hybrid steppers (the kind we most often use for hobby CNC)
have 200 steps per revolution, or 1.8 degrees per step. .9degree
motors are also widely available, for 400 steps/rev.
(Both of the above assume full step drive)

With microstepping, you can get smaller steps, but not necessarily
better precision. A gecko with divide by 10 would give 2K or 4K
steps/rev with the above motors...

Servos use encoders. The encoder sets the steps/rev of the servo
system. Since encoders are available from 1 step/rev to many
thousands of steps/rev; the thought that steppers have smaller
incremental moves may be suspect<G>

And linear encoders with even finer resolutions (microns!) also work
with servos...

Hope this helps,

Ballendo


In CAD_CAM_EDM_DRO, "Bob McKnight" <bobmcknight@c...> wrote:
<snip> I have been led to believe that steppers tend offer a smaller

> incremental movement than Servos