Re: Stepper vs Servo

> 1. why does everyone use steppers?

Cost. Simplicity. Availablity. It works.

> 2. Isn't closed loop system required to have good control of the

tool?

With an open loop system, you have to size the drive power so that
you never exceed the limits of power required, or you will loose
steps.

With a closed loop system you have to size the drive power so that
you never exceed the limits of power required, or the drive will
fault out.

Either way, a well designed system will never exceed its power
limits, and therefore the table/tool will alway be where it was
commanded, within the limits of accuracy and repeatablity.

Marriss has recommended something along the lines of, below 60W power
on a axis steppers are the clear choice, between 60W and 100W either
steppers or servos, and above 100W servos are the clear choice.

There was a lower powered servo system offered here a while ago which
may have altered that equation a little.

Regards,
Mark