Re: [CAD_CAM_EDM_DRO] Adding encoders to existing stepper system?

abbylynx wrote:

>I was wondering the following: how many steps/rev do I need for
>encoders? Do I absoloutely have to have encoders with more steps than
>the motor? If I had the same number of steps in the encoder as the
>stepper, wouldn't the small differences in their "phase" cause the
>motor to endlessly dwindle between the two positons?
>

No, most software, including EMC, had a deadband, over which distance no
move command
will be produced.

> Can I use an
>encoder with _LESS_ steps than the motor? I've seen many 50ppr
>encoders for quite cheap - that's work out to 1/50mm on my sherline..
>something I'd be more than happy with.
>
>

I guess, but it will reduce the resolution of the machine.

>Finally, what software to use? At the moment I'm using TurboCNC, but
>EMC does look quite appealing (especially the price :) )
>
>
>

EMC will do this. But, you need some kind of hardware to read the
encoder pulses.

Jon