hello every one , Greatings from Egypt, I am going to build CNC Router for woodworking and acrylic , I will use rack and pinion and guide rail , the x-axis has 2 steppers each Nema 34 1600 oz , i saw chineese CNC Routers using Planetary gears or Reducer gear the question is , why do i use a speed reducer , is there a problem to direct drive the stepper to the rack ?