抄録
It is imperative to evaluate gear measuring instruments for ensuring the measured values of gears. In other words, it is very important to verify the measurement uncertainty of a gear measuring instrument. JGMA (Japan Gear Manufacturing Society) has organized a special committee for the purpose of proposing an international standard for the evaluation system for gear measuring instruments. On investigation it has been decided that our contribution should focus on a digital gear measuring instrument, because in Japan it had been researched and developed for the first time in the world. This paper describes two types of prototype machines which have been designed and manufactured on the basis of digital measuring method with some new ideas. These instruments are required to be ultrahigh accurate enough to calibrate an involute master.
