Worm gear unit Mode of operation and layout of a worm gear Features - design and principle of worm gears Learning objectives/experiments - development of the main variables and relationships in a worm gear -- investigation of transmission ratio, torque, friction and self-locking -- determine the efficiency Specification [1] function and design of worm gears [2] bronze worm wheel [3] steel worm [4] 2 aluminium cable drums [5] worm, worm wheel and pulleys mounted on ball bearings [6] anodised aluminium base plate Technical data Cable drum - worm shaft diameter: Ø=40mm - worm wheel shaft diameter: Ø=120mm Worm gear - centre distance: 80mm - gear ratio: 30:1 - module: m=4mm - number of gears: 1 - force transmission: 10 Weights on the worm side - 1x 50N - 1x 20N - 2x 10N - 1x 10N (hanger with equalising mass) Weights on worm wheel - 1x 5N - 4x 2N - 1x 1N - 1x 0,5N - 1x 0,5N (hanger) LxWxH: 250x150x200mm Weight: approx. 22kg