Gears and Gear Drives : power transmissions and mechanical drives, multi-step drives, geometry of cylindrical gears, cutting process and geometry of gears cut with rack-type cutter, integrity of gears, elements of cylindrical gear drive design, bevel gears, planetary gear trains, worm gear drives, elements of worm gear drive design, load capacity of worm gear pair, forces, power losses and efficiency of worm gear drives, measuring values control of worm gear pair, calculations for central gears and planets, crossed gear drives, power losses and temperature of lubricant, design procedure for a gear pair.