MEASUREMENT COUNTER OF NUMBER OF MACHINING FOR AIR TAPPER

摘要

PROBLEM TO BE SOLVED: To allow measurement of completion of machining by detecting change of pressure of compressed air.SOLUTION: In tap machining by an air tapper 8 which is a tap machining tool driven by using compressed air as a power source, by preventing a reverse flow of air by a non-return valve 3 and adjusting speed of recovery of air pressure by a speed control valve 6, change of pressure of an air circuit is detected by a pressure sensor i to convert the change of pressure to an electrical signal, thereby the number of machining is electrically measured.