Quote Originally Posted by JAZZCNC View Post
Andy, just want to clear something up just in case you or others think the drives current rating is a must not exceed the limit or will break.! . . . They are not limited to 4.2a you can actually run them higher and you won't damage them. It's not recommended because you will over time shorten their life because they will run hotter and the gains will be limited so not worth doing. But you won't kill them running a little higher current.
I was aware that going slightly over would just lead to more cooling requirements, but didn't realize they were quite so lenient.

Let's explore this a bit though; those 4nm Nema23s from CNC4YOU just have "current" listed in the datasheet as 4A. Now is that likely to be a peak or RMS current suggestion?

My EM806 drivers, essentially the same as Desertboy's, have a current table with Peak and RMS, what settings would you use for these motors?

I'm kinda surprised we're talking about this machine being able to reach 20m/min, I'm stalling at half that!