Desktop Robot for Micro Screw Applications - Desktop Robot for Micro Screw Applications. The robot incorporates X-axis, and Y-axis. X and Y axes are powered by stepping servo motors, while the screwdriver stroke is powered by a pneumatic cylinder or AC servo motor, and the spindle rotation is powered by a NITTO driver. The screws will be automatically blow-feed by means of our centerboard hopper screw feeder equipped with a single-shuttle air escapement. Maximum working envelope of the robot is X-axis 190mm; Y-axis 335mm, Z-axis 50mm.