I'm part-way through a Warco WM16 mill conversion. The machine will be cutting metal - primarily mild steel. Is it generally best to cover the stepper motors or will they be OK? My main concern is that steel swarfe + magnets = birds nest. The drive couplings (Oldhams & Pulleys/Belts) will be covered with fabricated sheet metal guards...I'm just wondering if I should extend these so that the motors will be cowled?