Enabling switches are 3-position (OFF-ON-OFF) or 2-position (ON-OFF) switches. A 3-position enabling switch only allows machine operation when the switch is lightly pressed and held in the middle position (position 2). It will disable if released (position 1) or depressed further (position 3); this ensures the safety of the operator. A 2-position switch allows operation when the button is depressed and stops operation when no longer pressed.