Re: EMC and encoders

> From: "Wally K" <cnc4me@...>
>
> If using EMC to run stepper motors and you want to use encoder
> feedback. Are you supposed to match the encoder output count with
> the steps per revolotion. Or is more pulses the merryier. At this
> time i am thinking of using full step with 5mm lead screw, 2 to 1
> drive reduction, and G210 full step to 10 micro step driver. The
> encoder would be a 2 channel complimentry output 250 counts per rev
> and 1000 counts total. I would mount this encoder on the on the
> leadscrew shaft.

There are two variables for each axis that allow you to set the steps per
inch and the encoder ppr. They are

INPUT_SCALE =40000
OUTPUT_SCALE = 4000.000 0.000

So you can configure the EMC for any combination of motor/ratio and
encoder. If the resolution of the encoder is finer than the steps from
the motor you will need to also set a deadband big enough to allow the
axis to rest on a step rather than hunting between them.

Hope this helps

Ray