Arduino Uno - GRBL - High amp motor questions

Using Arduino Motors, Mechanics, Power and CNC
1

I want to create a CNC plasma.

I am looking at running GRBL on an Uno and had original thought to run the GRBL shield but am concerned that it cannot run larger stepper motors. So I started to look at commercial stepping controllers.

GRBLShield.
https://www.synthetos.com/webstore/index.php/assembled-electronics/grblshield-grbl-arduino-diy-cnc-shield.html

CW320

Could I run 3x CW230's in place of the GRBLShield?

would RESET-, CW-, CP- ground on the arduino,
CW+ hookup to Directon axis pin
CP+ hookup to the Step axis pin

Thanks.

2

There shouldn't be difficulty driving an opto-islated stepper controller - I presume the GRBL shield already
has step and direction pins for each axis?

However do check the interfacing requirements - so long as the controller does need more than 25mA
or so per signal no further interface hard needed (most opto isolators are 20mA or so)