Hi,

I have a very basic question/confusion. From my point of view there are at least two basic types of CN control:

1. The controller/software sends stepper/servo signals according to some code and the hardware controller controls the steppers/servos accordingly (open loop).
or
2. Like 1., but the controller/software reads the DRO data to measure the actual travel (closed loop).

The second alternative allows exact (up to the accuracy of the DRO) absolute positioning regardless of backlash or any other mechanical issues, the first alternative does not.

Now my question: How are hobby conversions typically done: closed, open or something entirely different?

It seems to me that -if the software supports it- a closed loop system has tangible benefits and is not considerably more complicated than an off-the-shelf DRO. Are people doing this?

-Jan.