I'm no expert on this subject matter and am anticipating (hoping!) others may have comments with even better hardware or software tips and tricks - but in the meantime there doesn't seem to be much content on YouTube on driving large Steppers with Arduino's, and I've had quite a few email inquiries about it, so here it is!
In this video, we machine a 0.75" hole in a ~7LB, 15" 1/4 inch steel plate, then turn a bushing which will let us secured the plate to the stepper D-shaft.
If you enjoy this NYC CNC video please hit the like button and share with a friend, it really goes a long way!