JPH0227844U

JPH0227844U -

Info

Publication number: JPH0227844U
Application number: JP10549588U
Authority: JP
Priority date: 1988-08-10
Filing date: 1988-08-10
Publication date: 1990-02-22

Description

[Brief explanation of drawings]

第１図は考案実施例の主軸の回転精度測定装置
の構成を示す図である。１０……主軸、１５……静圧軸受、１６……静
圧軸受ポケツト、１９……スラスト軸受ポケツト
、２０……芯出しプレート、２１……球ホルダ、
２２……被測定球、２６，２７……変位センサ、
４０……スリツププレート、４１……ブラシ（接
触子）、４２……ブラシ保持器。 FIG. 1 is a diagram showing the configuration of a spindle rotation accuracy measuring device according to an embodiment of the invention. 10... main shaft, 15... static pressure bearing, 16... static pressure bearing pocket, 19... thrust bearing pocket, 20... centering plate, 21... ball holder,
22... Ball to be measured, 26, 27... Displacement sensor,
40...Slip plate, 41...Brush (contact), 42...Brush holder.

Claims

[Scope of utility model registration request]

A rotational accuracy measuring device that measures the rotational accuracy of a main spindle that is rotatably supported on a headstock body and rotationally driven by a built-in motor, and a centering plate that centers a ball to be measured on the end face of the main spindle. Attach the ball to be measured to this centering plate via a ball holder, and measure the capacitance between the ball and the ball to be measured in the radial direction perpendicular to the spindle rotation axis to determine the displacement of the ball to be measured. a displacement sensor is provided to detect the headstock body, and a contactor that contacts the spindle is provided on the headstock body;
A spindle rotation accuracy measuring device characterized in that this contactor is electrically grounded.