Circular arc radius measuring ruler

Abstract

The invention relates to a circular arc radius measuring ruler, and discloses a measuring implement for measuring the internal radius and the external radius of a circular arc or a circle. The circular arc radius measuring ruler is formed by a main ruler, a sagging guide slot rocker, a cylindrical contact and a vernier, wherein a guide slot in the sagging guide slot rocker is formed in the perpendicular equally-dividing line of the sagging guide slot rocker. According to the generally acknowledged truth that three points which are not located on the same straight line can solely determine one circle, the circle center of the circle is located at an intersection point of the perpendicular equally-dividing line of a connecting line of any two points, the circle center of the measured circular arc can be determined, and the radii of the internal circular arc face and the external circular arc face are read through scales of the main ruler. The aim of infinitely measuring the internal radius and the external radius of the circular arc with the circular arc central angle smaller than 180 degrees is achieved, the measuring accuracy is high, the technical requirements for measuring persons are low, the operation process is simple, and the circular arc radius measuring ruler is easy to carry, low in cost and small in investment.

Description

technical field [0001] The invention is a measuring tool for measuring the inner radius and outer radius of arcs or circles. Background technique [0002] In the field of industrial production such as machinery manufacturing and mold processing, we often encounter the problem of measuring the inner radius and outer radius of a workpiece that is not a full circle or a full circle. At present, our existing measurement methods are: [0003] (1) Use the arc template (radius gauge) to measure. This method is limited by the number of arc templates. Most of the arcs cannot find the corresponding arc templates, and the infinite measurement cannot be realized. [0004] (2) Measure with an ordinary caliper, and obtain the radius by measuring the diameter. If the central angle of the measured arc is less than 180°, the radius of the arc cannot be obtained. If the chord length of the arc is measured by controlling the arc height, the radius of the arc must be obtained through digital c...

AI Technical Summary

Problems solved by technology

[0008] In order to overcome the existing inability to measure the arc radius with an arc template (radius gauge), the infinite measurement cannot be realized, and the arc radius cannot be measured with an ordinary caliper to measure the arc whose central angle is less than 180°. Due to the high technical requirements of the measurer, cumbersome operation process, high instrument value and large investment, the present invention provides a circular arc radius measuring ruler. °The inner radius and outer radius of the arc have low technical requirements for the measurer, the operation process is simple, easy to carry, low cost and small investment

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