| 摘要 |
PURPOSE:To obtain a groove radius measuring device excellent in workability and having high measuring accuracy, by contacting the measuring leg part of a jig main body with the curved surface of a semicircular groove part and subsequently contacting the measuring terminal of a dial gauge with said curved surface. CONSTITUTION:The measuring leg part 5C of the jig main body 5 of a groove radius measuring jig 3 is contacted with the curved surface of a semicircular groove part 2 while said measuring jig 3 is inserted in the semicircular groove part 2 from the open side thereof and the measuring terminal 4A of a dial gauge 4 is subsequently contacted with the curved surface of the semicircular groove part 2 to read the value of the dial gauge 4. Subsequently, the read value of the dial gauge 4 is allowed to correspond to the prepared conversion table of the read value and the radius of the semicircular groove part 2 to measure the groove radius of the semicircular groove part 2. By this method, since workability for measurement is markedly enhanced and, further, the radius of the semicircular groove part 2 can be caught as a numerical value, for example, a valve body an be selectively engaged with the semicircular groove part 2 and quality control becomes easy.
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