JPH03186701A - Measuring auxiliary instrument for calipers - Google Patents

Abstract

PURPOSE:To easily and exactly measure the dimension from a chamfered corner by allowing two faces of the inside to suck closely to the chamfered angle of an object to be measured, and measuring the dimension from the corner as the dimension from the outside surface of a metallic block. CONSTITUTION:By an embedded magnet 6, a metallic block 2 sucks closely to a corner 9 of an object 8 to be measured, and its outside surface is put against the measuring tip 71 of calipers 7 and measured, therefore, it is measured exactly without inching the block 2 by measuring force, and by subtracting a prescribed value, a true value is obtained. Also, by a dimension scale 5 of an inner corner 4 of an end face 3, the dimension of the corner 9 can be brought to direct-reading. Moreover, a measuring auxiliary instrument is attached and detached by a suction of the magnet 6, therefore, it can be used for most iron structural members, and can be attached and detached in an arbitrary position, but when it is formed by a special iron alloy material and its suction is weak by usual magnetic force, it is embedded so as to be convertible so that the magnet 6 can be changed with a strong one.

Description

[Detailed Description of the Invention] [Summary] The purpose of this invention is to provide a measurement method for easily and accurately measuring dimensions from a chamfered edge regarding a measuring aid for a caliper, and to provide a measuring aid for a caliper that measures metal of a predetermined thickness with a right-angled cross section. A block with a dimension scale set at the orthogonal origin at the inner corner of the vertical end face, and a magnet embedded in a removable manner with a slight gap on one side of the inside of the metal block. The two inner surfaces of the metal block are closely adsorbed, the dimension from the corner can be easily measured as the dimension from the outer surface of the metal block, and the chamfered dimension of the corner can be directly read on a dimension scale.

[Industrial application field]

The present invention relates to a measuring aid for calipers.

Dimensional inspection is essential for structural members.

Dimension measurements for this inspection are generally performed directly with calipers or micrometers, but if this is difficult, indirect measurements using general-purpose auxiliary tools are used, but either method allows for easy and accurate measurements and increases efficiency. It is hoped that

[Conventional technology] FIG. 2 shows an example of a conventional method for measuring dimensions.

As an example of the conventional method, dimension measurements based on chamfered corners are extremely frequent measurements that are always performed on three-dimensional structural members.

However, as shown in Figures 2 (a) and (b), in both cases the corner 9
This is a measurement of a hole of H2φ whose center is at the position of dimension H from 5°96, and since there is a C chamfer or R chamfer at the corner 95.96 of the object to be measured 85.86, the measurement tip 71 of the caliper 7 is I can't hit the 95 and 96 faces.

In Figure (a), the auxiliary straight edge 15 is brought into close contact with the corner 95 to extend the corner surface, and the straight edge 1
One end is placed on the surface of No. 5 to measure the dimension H3 to the hole edge, and the hole diameter H2 is also measured and calculated as the dimension H-Hi H2/2.

In Figure (b), the caliper 7 is tilted to measure the dimension H4 between the edge of the corner 96 and the hole edge, and then H2 is measured, and the dimension H=H
Calculated at 4+Hz/2.

[Problems to be Solved by the Invention] However, (1) In the measurement method shown in FIG. 3(a), unless the method of applying the straight edge 15 is firmly fixed, the measured value may vary depending on the measurement pressure of the caliper 7.

■ Also, it takes time to attach and detach the straight edge 15.

■ In the case of Figure (b), the caliper 7 is measured at an angle, and the edge of the corner 96 may not be clearly visible.
Accurate measurements cannot be made.

(2) Furthermore, measurement of the C dimension and R dimension of the chamfered edges 95 and 96 must be done using a different method.

There are other problems.

SUMMARY OF THE INVENTION In view of these problems, it is an object of the present invention to provide a measuring method for easily and accurately measuring dimensions from a chamfered edge.

[Means for Solving the Problems] The above problem is solved by using a metal block 2 with a right-angled cross section and a predetermined thickness, as shown in FIG. provided,
A magnet 6 is replaceably embedded in one side of the inside of the metal block 2 with a slight gap, and the two inside sides are closely attracted to the chamfered corner 9 of the object to be measured 8, and the dimensions from the corner 9 are measured. Easily measure the dimension from the outer surface of the metal block 2, and directly read the chamfer dimension of the corner 9 on the dimension scale 5.
This problem is solved by the caliper measuring aid 1 of the present invention.

[For production]

That is, the metal block 2 is closely attracted to the corner 9 of the object to be measured 8 by the buried magnet 6, and since the outer surface of the metal block 2 is placed against the measuring tip 71 of the caliper 7, the metal block 2 moves slightly due to the measuring force. The true value can be obtained by subtracting the predetermined thickness value.

Furthermore, the dimension scale 5 on the inner corner 4 of the end face 3 allows the C dimension and R dimension of the corner 9 to be directly read.

In addition, the measurement aid 1 can be attached and detached by the attraction of the magnet 6, so it can be used on most iron structural members, and it can be attached and detached easily and quickly to any position. If the magnetic attraction is weak, the magnet 6 is buried so that it can be replaced with a stronger one.

In this way, it becomes possible to provide a measurement method that easily and accurately measures dimensions from the edge of the chamfer.

〔Example〕

The present invention will be specifically described below with reference to embodiments shown in the drawings. The same reference numerals indicate the same objects throughout the figures. Figure 1 (
a) is a perspective view of a measurement aid according to an embodiment of the present invention;
An example of the same usage is shown in b).

This embodiment is applied to the dimensional inspection of iron structural members of electronic devices, and the object to be measured is relatively small and can be directly measured with calipers.

As shown in Figure 1(a), the measurement aid 1 is made from a metal block 2 made of steel with an exact thickness of 5 mm and a cross section orthogonal to 30 mm and 40 mm long. , dimension scale 5 with the inner corner 4 of the end surface 3 perpendicular to the length direction as the orthogonal origin
is engraved in 1 mm increments. Furthermore, 1 on the inner surface of the long side.
A square hole 21 of 0 x 25 x depth 3 [1 Tffl is drilled, and a magnet 6 with a thickness of 2.7 ma+ is attracted and buried, so that the surface of the magnet 6 is exposed on a surface sunk 0.3 mm from the inner surface. are doing.

The magnetic force of the magnet 6 increases depending on its size, and it is also possible to increase the magnetic force depending on the type of material.
One of the following sizes is used, and if necessary, the number is increased to two, and to make it even stronger, it is replaced with a stronger type of magnet 6.

To explain an example of the use of this measuring aid l, as shown in Fig. chamfering is being carried out.

For this measurement, the two inner surfaces are brought into close contact with the corner 9, the measurement aid 1 is fixed by suction, and the dimension H1 from this outer surface to the hole edge is measured with a caliper 7, and the hole diameter H8 is separately measured.
H = HI + Hz/2 5 mm, D = Hz (5 digits is the thickness of the measurement aid 1).

Incidentally, the chamfer dimension CX can be inspected including the inclination state of the surface by reading the chamfer dimension until it touches the dimension scale 5 of the circular corner 4.

The above embodiment shows an example, and the shapes and dimensions of each part are not limited to those described above.

Although the corner 9 was C-chamfered, the case of R-chamfer is exactly the same, and the dimension of the inner corner 4 up to the point where it touches the dimension scale 5 becomes the R dimension.

[Effect of the invention] As described above, by using the measurement aid of the present invention,
This makes it possible to easily and accurately measure dimensions from a chamfered corner, which greatly contributes to improving inspection efficiency.

[Brief explanation of drawings]

FIG. 1 shows a measuring aid according to an embodiment of the present invention, and FIG. 2 shows a conventional dimension measuring method. In the figure, ■ is a measurement aid, 2 is a metal block, 3 is an end surface,
4 is the inner diameter, 5 is the dimension scale, 6
is a magnet, 7 is a caliper, s, 8s, s6 are objects to be measured, 1
5 is a straight edge, 9, 95.96 is a corner, 21 is a square hole, and 71 is a measuring tip. (Illusion/C+I ton diagram This invention's first fruit Asahi I series 50.1 fixed god nuka tool diagram

Claims (1)

[Claims] A metal block (2) with a right-angled ■-shaped cross section and a predetermined thickness, with a dimensional scale (
5) is provided, and a magnet (6) is replaceably embedded in one side of the inside of the metal block (2) with a slight gap, and a chamfered corner (9) of the object to be measured (8) is installed. the two inner surfaces of the metal block (2) are closely adsorbed, the dimension from the corner (9) is easily measured as the dimension from the outer surface of the metal block (2), and
A measuring aid for a caliper, characterized in that the chamfer dimension of the corner (9) is directly read on the dimension scale (5).