PURPOSE: To provide a work adherence confirming device confirming the adherence of works mounted on machining bases and preventing the inflow of a cooling liquid into fluid feed circuit systems at the time of machining.

CONSTITUTION: Shuttle valves 46a-46n are arranged for machining bases 48a-48n, and a high-pressure fluid feed circuit system 42 and a low-pressure fluid feed circuit system 44 containing variable throttle valves 62a-62n are connected to the shuttle valves 46a-46n via pressure switches 58a-58n respectively. The throttle degrees of the variable throttle valves 62a-62n are adjusted in response to the distances from a pressure fluid feed source 50, and the fluid pressures of the low-pressure fluid feed circuit system 44 fed to the machining bases 48a-48n respectively are made uniform regardless of the distance from the pressure fluid feed source 50. The switching action between the high pressure and low pressure by the shuttle valves 46a-46n is immediately transferred to the machining bases 48a-48n.