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Calliper for measuring radius

A technology of arc radius and calipers, which is applied in the field of measuring tools, can solve the problems of high manufacturing cost, high precision and difficulty in measuring ball heads, and achieve the effect of improving reliability and accuracy

Inactive Publication Date: 2006-08-16
梁加政
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. The distance between adjacent scales on the main scale of the caliper is not equal, that is, the scale spacing of the main scale is not linearly equidistant, which is not conducive to reading
[0006] 2. Since the scale spacing of the main scale is not set linearly and equidistantly, and the scale spacing of the vernier scale of the caliper can only take the average value of the ratio of the scale spacing of the main scale, so the scale spacing of the vernier scale is also unequal, so that it cannot be measured Make the measured value more accurately reflect the true value of the measured arc radius
[0007] 3. Since the scale spacing of the main ruler is not set linearly and equidistantly, it can only be made into a caliper such as a vernier. When measuring a vernier caliper, it is relatively difficult to further improve the accuracy of the caliper system due to the influence of human vision, and it varies. If the caliper with scale spacing is to be made into a caliper with a table and a digital caliper, it is even more difficult
However, it is difficult to achieve high precision in manufacturing the measuring ball head, and its manufacturing cost is relatively high

Method used

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Embodiment Construction

[0038] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0039] Such as figure 1 As shown, in theory, take three points A, B, C on the circle O. AC and AD are always constant values, AD is the height of triangle ABC, OE is the height of triangle OAC, BD>DC, BC2 = r 2 -(b / 2) 2 . From equations (1) and (2): (3)r 2 =(b / 2h) 2 a1 2 +(b / 2) 2 (where r>0, a1>0) or: (4)x 2 / (b / 2) 2 -y 2 / h 2 =1 (where x>0, y>0). Equation (3) is a hyperbolic equation (r is the arc radius; a1+a2 is the chord length; h is the chord height, which is a constant; b is the length of AB, which is a constant), as can be seen from equation (3), as long as b and h are constant constants, then the value of r can be determined by the value of a1, when r=x=p>0 (p is a constant), a1 (y value) corresponds to r (x value) one by one, a1+ a2 is the chord length of ABC three points. That is, when the chord height h and the distance between the tw...

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Abstract

A calipers for measuring radius of arc consists of body with arc radius scale and vernier being able to slide along said body .It features that said arc radius scale is set in linear and interval way and correction is set correspondingly to arc radius scale on said body.

Description

【Technical field】 [0001] The invention relates to a measuring tool, in particular to a caliper for measuring the radius of an arc. 【Background technique】 [0002] At present, in order to measure the radius of the arc, measuring tools such as R gauges or 3D manipulators are commonly used. However, the R gauge can only measure within a limited range. Although the 3D manipulator can accurately measure the radius of the arc, and the measurement range is not limited, it is expensive, bulky, and inconvenient to carry, resulting in limited places for use. [0003] In order to solve the above-mentioned defects, the Chinese utility model patent (its notification number is CN 2682373Y) announced on March 2, 2005 discloses another kind of caliper for measuring the radius of an arc. The measuring principle of the caliper is: take three points on the measured arc, according to the relationship between the chord length, chord height and arc radius of the arc, that is, r=d 2 / 8h+h / 2 (r ...

Claims

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Application Information

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IPC IPC(8): G01B3/38
Inventor 梁加政
Owner 梁加政