| 摘要 |
PURPOSE:To measure tooth thickness with high accuracy by forming a couple of rack teeth with a specific pressure angle on a gauge main body, fitting a dial gauge on the opposite side from them, and projecting the measuring element to a bottom groove part between both rack teeth. CONSTITUTION:The rack teeth 2A and 2B which has the same pressure angle alphaas the pressure angle of a gear 11 to be measured are formed at one side part of the gauge main body 1. Their tooth surfaces 3A and 3B have their center parts 4 swelling in a horizontal sectional shape so as to improve the contacting between the gear 11 and tooth surfaces. Further, a through hole 5 is formed in the center of the opposite part of the main body 1, the dial gauge 6 is fitted in the hole 5, and the measuring element 7 is projected into the bottom groove part 8 between the teeth 2A and 2B. the measuring element 7, therefore, moves on a straight line running in the center of the gear 11. Thus, main body 1 and gear come into surface contact, so the tooth surfaces 3A and 3B hardly wear away and even if the pressing force of the gear 11 to the main body 1 varies depending upon a measuring person, there is a little influence upon the measuring element 7 and a high-accuracy measurement is taken.
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