Process for machining pressure detection hole and apparatus for machining pressure detection hole

A process for machining a pressure detection hole in which, in a pressure detection member formed from a band-shaped sheet having the width direction as an X axis direction, the longitudinal direction as a Y axis direction, and the thickness direction as a Z axis direction and having formed in the interior thereof a plurality of pressure detection passages spaced at predetermined intervals in the X axis direction and extending in parallel to each other in the Y axis direction, a plurality of pressure detection holes that communicate respectively with the plurality of pressure detection passages from one surface side of the pressure detection member and that are spaced at predetermined intervals in the Y axis direction are machined by means of a drill moving in the Z axis direction, the process comprising:

• a first step of measuring and storing positions in the X axis direction of one side edge of the pressure detection member and the plurality of pressure detection passages by moving the pressure detection member in the X axis direction while checking an enlarged image of the pressure detection member and a tip of a stylus, which can be exchanged for the drill, so as to make an axis of the stylus coincide in sequence with said one side edge of the pressure detection member and the plurality of pressure detection passages;
• a second step of giving the pressure detection member a marking indicating a position in the Y axis direction at which the pressure detection hole is to be machined;
• a third step of positioning the pressure detection member by moving it in the Y axis direction based on the marking so that the position in the Y axis direction of the pressure detection hole that is to be machined coincides with the position of the axis of the drill that the stylus has been exchanged for;
• a fourth step of positioning the pressure detection member by moving it in the X axis direction so that the position in the X axis direction of the pressure detection hole that is to be machined coincides with the position of the axis of the drill;
• and
• a fifth step of machining the pressure detection hole by moving the drill in the Z axis direction;
• the plurality of pressure detection holes being machined by repeating the third step to the fifth step.