Question: 7.7 One axis of an open-loop positioning system is driven by a stepper motor, which is con- nected to a ball screw with a gear

7.7 One axis of an open-loop positioning system

7.7 One axis of an open-loop positioning system is driven by a stepper motor, which is con- nected to a ball screw with a gear reduction of 3:1 (three turns of the motor for each turn of the screw). The ball screw drives the positioning table. Step angle of the motor is 1.8, and pitch of the ball screw is 7.5 mm. The table is required to move along this axis a distance of 300 mm from its current position in exactly 20 sec. Determine (a) the number of pulses required to move the specified distance, (b) pulse frequency, and (c) rotational speed of the motor to make the move

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