Abstract
The measurement of accumulative pitch error is one of the most important items in accuracy measurement of gears.
However, by the conventional methods the time for measuring is long and it is very difficult to measure fine pitch gears (m=0.11).
To solve the above-mentioned problems, a new measuring method combining a gear type condenser with an involute helicoid worm has been developed.
The gear to be measured is accurately indexed by the worm, the pitch errors are detected with the condenser.
It has been confirmed by the experiments that the accumulative pitch error can be measured with high accuracy by this method.
For an indication of the accuracy of this method, a hobbed spur gear was measured by this method and by the conventional Carl Zeiss gear tester.
The obtained data agreed within 3μ. It is not surprising to have a nominal difference such as this if the tooth profile errors are taken into consideration.
Also, the time for measuring reduced from 35 to 5 minutes.
