Manufacture Gear

gear cutting simulation (playing length 1m35s).

as of 2014, estimated 80% of gearing produced worldwide produced net shape molding. molded gearing either powder metallurgy or plastic. many gears done when leave mold (including injection molded plastic , die cast metal gears), powdered metal gears require sintering , sand castings or investment castings require gear cutting or other machining finish them. common form of gear cutting hobbing, gear shaping, milling, , broaching exist. 3d printing production method expanding rapidly. metal gears in transmissions of cars , trucks, teeth heat treated make them hard , more wear resistant while leaving core soft , tough. large gears prone warp, quench press used.