Material Handling Systems - Conveyor and Lifting Platform The Earthmover machine is used to extract and crush rock from the quarry face. It then screens and grades the crushed rock. Its conveyor transmission system uses a lead screw and screw jack to move containers of material both horizontally and vertically. Two compound gear train arrangements, G1 and G2, are available: The compound gear train arrangement G1 has a 40- teeth driver gear A, meshing with a 100 - teeth gear B. Gear C, with 70 teeth is mounted on the same shaft as B and meshes with gear D on the output shaft having 140 teeth. The G2 arrangement has a 30- teeth driver gear A, meshing with a 90 - teeth gear B. Gear C, with 60 teeth is mounted on the same shaft as B and meshes with gear D on the output shaft having 180 teeth. The input power for the gear box is X kW at Yrpm and its efficiency is 98%. Calculate the velocity ratios of the two compound gear train arrangements,G1 and G2. Based on gear train arrangement G1 calculate the holding torque required to securely mount the gearbox. Where X Kw=11 Y rpm=1000