Author(s)

R.C. Frazer and J. Hu

Abstract

This paper describes the most common methods of inspecting gears and the measuring machines used. Methods of verifying the accuracy of gear measuring machines are discussed, with particular reference to EGA codes of practice. Some example results are presented. 1. Background Gears are important mechanical components found in 90% of mechanical transmissions. They have a complex geometry and transmit high power, often at high speed. They must be made very accurately if their load carrying capacity and noise levels are to be acceptable in service. Nearly all parallel axis gears are involute spur or helical gears. Involute gears may be inspected by a number of methods, but the most commonly used is to check the individual error parameters. That is lead (tooth alignment) errors, profile (involute profile) errors, and p

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