A gear is a rotating circular machine part having incising or, in the case of a cog or bull gear, inserting teeth (called a cog) which meshes with another (compatible) toothed part to transmit (convert) torque and speed. The fundamentals behind how gears work are similar to the fundamentals of a lev

The distinctive feature of the kinematic geometric measurement method is that it vividly reflects the gear meshing transmission process and accurately reveals the variation law of the gear single error and the relationship between the errors, which is especially suitable for gear technology error analysis and dynamic performance prediction.