It is very difficult to check accuracy of such large gears as used in ship turbine reduction mechanisms. The requirement of very high accuracy of these large gears, for example 4 or 5 meters of diameter, has recently been brought out and the accuracy measuring instruments for these large gears are becoming of much necessity.
The authors studied the instruments under the sponsorship of The Accuracy Committee of The Ship Machinery Manufacturers' Association of Japan, and have succeeded to make the accuracy-measuring instruments with satisfactory accuracy. These instruments are made to measure the accuracies of tooth profile, surface undulation and circular pitch of large gears, and have been practically used to measure reduction gears of ship. The preliminary test of single-flank gear tester was carried out.
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