Small Aperture Measuring Tool

Abstract

The utility model relates to a small-aperture measuring tool, which has a simple structure and can quickly and accurately measure very commonly used small-aperture mounting holes. The small aperture measurement tool is in the shape of scissors as a whole, and has a first component, a second component and a measurement feedback part for feeding back the aperture size of the small hole to be measured. One end of the first component and the second component is respectively provided with a hole for adjusting the aperture size. The measuring part for measuring, the other ends of the first member and the second member are each formed as a gripping part, and at the position close to the measuring part of the first member and the second member, the first member and the second member are connected by a fixing piece Fixed, at the positions of the first member and the second member close to the gripping part, the measurement feedback part is connected to each other, the first member and the second member can use the fixing piece as a fulcrum, so that the gripping part of the first member and the second The gripping parts of the two components are separated, so that the measuring part of the first component is separated from the measuring part of the second component, so as to measure the aperture size of the small-diameter installation hole.

Description

technical field [0001] The present invention relates to a measuring tool, more particularly to a small-aperture measuring tool for measuring very commonly used small-aperture installation holes. Background technique [0002] In the assembly of aircraft structures, most of the connections are connected by fasteners (such as rivets, pins, etc.), and their apertures are relatively small, about 3.2-6.35mm, which is also referred to as "small aperture" below. [0003] When measuring small apertures, for the mounting holes of commonly used fasteners, the measuring tool used is, for example, a go-no go gauge; for the mounting holes of non-commonly used fasteners, then Only the following methods can be used for measurement: [0004] (1) A ball head clearance gauge is used to measure the non-used mounting holes. However, since the ball head clearance gauge can only be used for indirect measurement, the accuracy of the measurement is not high. [0005] (2) Use coordinate measuring m...

AI Technical Summary

Problems solved by technology

[0004] (1) Use the ball head clearance gauge to measure the non-used mounting holes. However, since the ball head clearance gauge can only be used for indirect measurement, the accuracy of the measurement is not high

[0005] (2) Use coordinate measuring machine (coordinate measuring machine) to measure the installation holes that are not used. However, sometimes the installation holes that need to be measured are located in fastened and non-detachable large parts. Therefore, the measurement will be limited by space. In addition , due to the large size of the three-coordinate measuring machine and inconvenient transportation, the measurement is extremely inconvenient

[0006] (3) Use ordinary measuring tools, such as vernier calipers, inner diameter micrometers, etc. to measure very common mounting holes, but these measuring tools are not suitable for small-diameter mounting holes

[0007] (4) When there are out-of-tolerance holes (for example, oval holes or "8"-shaped holes) in the mounting holes of fasteners, it is obvious that the above methods (1) to (3) cannot be applied. At this time, only the steel tape measure

However, the accuracy of this out-of-tolerance hole will directly affect the design treatment measures

Images