ems pdf-Foxit Reader Edit View Tools Comments Forms SharePoint Help art D A Jacking Unit consists of a pinion and servo-motor. The pinion runs up a rack and lifts mass m including the Jacking Unit. The inertia of the unit with respect to the pinion speed is J and the mass of the unit is m. i) For idle conditions what is the required Moment M. ii) The mass accelerates from zero velocity to 2 m/min within 60 sec. Calculate the required angular velocity of the pinion. iii) For ii) calculate the required Moment M. iv) Calculate the contact force between pinion and rack during the acceleration in ii) Hint: The pinion is simplified to a cylinder with radius R (no teeth). m = 5000 kg my = 500 kg M J = 1000 kgm R = 200 mm m E