Developed is a new tooth surface measurement of conical involute gears by CNC gear-measuring machines. Advances in the design and production of conical involute gears and its wide applications are demanding the measurement of the conical involute gears using CNC gear measuring machines. Therefore, a new concept called an “equivalent helical gear” is introduced. Thus, a conical involute gear can be measured as a helical involute gear. Experiments demonstrate that this new method gives accurate results and has practical value. Finally tooth surface analysis of a conical involute gears is also presented.

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