Applying a servo mechanism to the single flank gear mesh tester which was developed by us in 1960, we obtained a efficient mesh tester. By using only one set of datum circular plates, the single flank gear mesh test can be done easily and efficiently for any kinds of gear ratios of test gears and also for all types of test gears such as circular and noncircular gears.
The present tester can be used not only for testing fine pitch gears, but also for testing medium size ones, and furthermore it is able to reduce remarkably the time necessary for testing.