Gear accuracy refers to the comprehensive error of the gear shape divided into a level, including tooth shape, tooth direction, radial jump and other important parameters, wherein tooth shape refers to the radial shape of the tooth, tooth direction refers to the longitudinal shape of the tooth, radial jump refers to the error of the distance between adjacent two teeth, generally our automobile gears can be processed by gear hobbing machine, 6~7 levels can be used, and some printing machines because of the need for high-speed operation and batch printing, so the need for high-precision gears to reduce the error caused by the accumulation of gears and reduce the printing effect, The domestically produced gear grinding machine can be processed to level 4~5, the high-precision gear grinding machine imported from abroad can be processed to level 3, ~ 4, and some can be processed to level 2. The Japanese standard DIN level 0 is equivalent to the 4 level judged by China, and the general error is measured in μm, 1μm = 0.001mm
