| 摘要 |
A machine with a worn detection function for a tool capable of reliably carrying out a worn detection for a tool. A present consumption power PW1 of a built-in motor 19, driving a main shaft 11, is watched and compared with a reference consumption power PW2, previously defined, by using a load meter 31, an A/D converter 32, a comparator 33 and a processing unit 34, thereby wear on the tool 12 is detected when the consumption power PW1 is larger than the reference consumption power PW2 as a cutting process is advanced. The main shaft 11 is supported by air static-pressure bearings 14 to 18, so that noise created with rotating, which exert an influence upon the consumption-power detected value, is extremely smaller as compared with the conventional antifriction bearing and so on. Thereby allowing delicate fluctuation of the consumption power to be detected, and naturally the worn detection for the tool 12 to be ensured.
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