JPH07174503A - Measuring tool for axis of internal thread - Google Patents

Abstract

PURPOSE:To measure the accuracy of the machining axis of the central axis of the opening of an internal thread provided in a flat surface simply by easy handling. CONSTITUTION:This tool is constituted of a true cylinder part 1a, an external thread part 1b having the same pitch as the pitch of an internal thread hole to be measured 3 and a blind hole 1c, wherein a coil spring 2 is inserted into the central part of the edge of the external thread. This measuring tool is tightened into the internal thread hole 3 until the bottom contact state is obtained on a surface plate 4. Under the state that the repelling force of the coil spring 2 is induced, the accuracy of the axis of the internal thread to be measured is measured by converting the direction of the axis of the internal thread to the cylinder part 1a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a female screw shaft measuring tool capable of easily measuring the state of a female screw shaft provided on a plane by a simple operation.

[0002]

2. Description of the Related Art Conventionally, there is virtually no requirement for the verticality of a female screw axis, and in the measurement, a method for measuring the mechanical contact with a screw thread using a three-dimensional measuring device and a screw hole to be measured. There is a method in which a shaft machine having an equal pitch is fastened and the displacement of the machine is measured with a dial cage.

[0003]

However, it is difficult to position the measuring point on the screw thread by the mechanical contact measuring method on the screw thread using this type of three-dimensional measuring device, and the space inside the screw hole is small for small diameter screws. Has a problem in that the workability is poor because of the narrow width, and factors such as the surface roughness of the screw thread surface influence the measurement accuracy.

Further, in the method of measuring the displacement amount of the shaft portion machine fastening to the screw shaft, there is a problem that it is difficult to set the coordinates in the horizontal direction.

[0005]

In order to solve the conventional drawbacks, the female screw shaft measuring tool of the present invention has a true cylindrical portion as a measuring medium for three-dimensional measurement and the same pitch as the female screw holes at the measuring points. Equipped with a male screw part and a coil spring in the screw hole on the screw end surface, and accurately extract the shaft state of the female screw to be measured by screwing the main side fixing tool into the screw hole opening for which shaft measurement is required. You can

[0006]

1 is a sectional view of a female screw shaft measuring tool according to an embodiment of the present invention. The main body comprises a true cylindrical portion 1a, a screw thread 1b at the other end, and a blind hole 1c for inserting the coil spring 2 at the center of the screw thread end surface.

FIG. 2 is a view showing a usage state of the female screw shaft side fixing tool of the present invention. In use, the measuring female screw hole 3 on the surface plate 4 is required to be measured for axial accuracy. Tighten until the screw part side of the main body 1 bottoms out. As a result, a repulsive force is generated in the built-in coil spring 2 and the screw thread 1b of the main body 1 can be fixed in contact with the screw thread of the measurement female screw hole 3, and the true female cylindrical portion 1a of the main body 1 in the axial direction of the measurement female screw. Can be converted to.

[0008]

As is clear from the above description, the present measuring tool is a component for taking out the female screw shaft provided on the plane into the space, and by measuring the true cylindrical portion with a three-dimensional measuring device, The accuracy of the axis can be easily known, and the measurement accuracy can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view showing a usage state of an embodiment of the present invention.

[Explanation of symbols]

 1 Main body 1a True cylindrical portion 1b Screw thread portion 1c Blind hole 2 Coil spring 3 Measuring female screw hole 4 Surface plate

Claims (1)

[Claims] 1. A female screw shaft comprising a true cylindrical portion, a male screw portion having the same pitch as a female screw hole pitch to be measured, a blind hole provided in a central portion of an end face of the male screw portion, and a coil spring inserted in the blind hole. Measuring tool.