| 摘要 |
PROBLEM TO BE SOLVED: To provide a working machine for a printed circuit board, improved in machining efficiency by optimizing dust collecting power. SOLUTION: A pressure sensor 23 for detecting dust collecting power, that is, one of the flow rate, speed and pressure of air passing through piping 20, is disposed on the way of the piping 20. An NC device 30 is stored with a data table stating optimum dust collecting power for every diameter of a drill 14. When machining, the output of the pressure sensor 23 is monitored, and a dust collector 22 is controlled to set the dust collecting power to the optimum value.
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