Measuring head for air micrometer

A measuring head for an air micrometer, the measuring head configured to be mounted on a main spindle of a machine tool at the time of measurement and inserted into a bush hole of a bush attached to a work table of the machine tool, for measuring an amount of eccentricity between the bush hole and the main spindle,

• the measuring head characterized by comprising:
• a measuring-head body portion;
• and
• a measuring-head tip portion provided on a distal end of the measuring-head body portion, and configured to be inserted into the bush hole at the time of the measurement, the measuring head characterized in that
• one or a plurality of measurement air nozzles are formed in the measuring-head tip portion the measurement air nozzles configured to blow measurement air to a gap between an outer peripheral surface of the measuring-head tip portion and an inner peripheral surface of the bush hole respectively through jetting openings in the outer peripheral surface at the time of measurement,
• individual measurement air supply passages corresponding to the respective measurement air nozzles are formed in the measurement-head body portion,
• the measurement air is supplied to the measurement air nozzles respectively through the individual measurement air supply passages,
• the measurement air nozzles are a single measurement air nozzle formed to extend in a radial direction of the measuring-head tip portion,
• the measurement air supply passages are a single measurement air supply passage for supplying the measurement air to the single measurement air nozzle, and
• the measurement air is supplied from a measurement air supply passage that is formed in a support portion of the main spindle, through a measurement air supply passage in a rotary joint mounted on the measuring-head body portion, to the measurement air supply passage in the measuring head body portion, or
• the measurement air is supplied from a measurement air supply passage that is formed in a support portion of the main spindle, through a measurement air supply passage in a rotary joint mounted on the main spindle as well as a measurement air supply passage that is formed in the main spindle, to the measurement air supply passage in the measuring head body portion.

A measuring head for an air micrometer, the measuring head configured to be mounted on a main spindle of a machine tool at the time of measurement and inserted into a bush hole of a bush attached to a work table of the machine tool, for measuring an amount of eccentricity between the bush hole and the main spindle,

• the measuring head characterized by comprising:
• a measuring-head body portion;
• and
• a measuring-head tip portion provided on a distal end of the measuring-head body portion, and configured to be inserted into the bush hole at the time of the measurement,
• the measuring head characterized in that
• one or a plurality of measurement air nozzles are formed in the measuring-head tip portion, the measurement air nozzles configured to blow measurement air to a gap between an outer peripheral surface of the measuring-head tip portion and an inner peripheral surface of the bush hole respectively through jetting openings in the outer peripheral surface at the time of measurement,
• individual measurement air supply passages corresponding to the respective measurement air nozzles are formed in the measurement-head body portion, and
• the measurement air is supplied to the measurement air nozzles respectively through the individual measurement air supply passages,
• the measuring-head body portion includes:
• a distal-end-side member to which the measuring-head tip portion is fixed;
• a proximal-end-side member;
• an elastic member interposed between the distal-end-side member and the proximal-end-side member;
• and
• a flexible hose connecting a measurement air supply passage that is formed in the distal-end-side member and a measurement air supply passage that is formed in the proximal-end-side member to each other.