JP3177173U - Effective diameter measurement attachment jig for metric female threads - Google Patents

Abstract

An attachment jig for use in measuring an effective diameter of a female screw for a general machine attached to a JIS standard digital caliper is provided.
Attachments 1 and 2 provided with chevron teeth 3 and 4 processed using special steel are fixed to outer jaws 13 and 14 of a digital caliper 12 with M4 bolts 17, 18, 19 and 20.
[Selection] Figure 1

Description

This device measures the effective diameter of female screws for general machines that are machined with an attachment jig created on a digital caliper.

Conventionally, the effective diameter of a female screw has been measured using a commercially available male screw product or a highly accurate limit plug gauge.

This has the following drawbacks.
(B) When trying to measure the effective diameter, it is generally impossible to find a numerical answer, so a JIS standard vault screw product may be used as a model.
(B) Micrometers and screw plug gauges with spherical measuring pieces are expensive and are not suitable when the inner diameter of the female thread to be measured is large.
(C) It is economically questionable to arrange various limit gauges at high cost and with different workpiece dimensions.

The present invention is an effective measurement of female screws for general machines of the same nominal size to be machined. Two parts with different shapes are made of special steel to measure with digital calipers, the left attachment (1) and the right attachment (2) and by providing protrusions (5) and (6) on each of them and engaging with the grooves, the left attachment tooth mold part (3) and the right attachment tooth mold part (4) are fixed in an accurate position. In addition, accurate measurements can be made, and pitch dimensions and correction dimensions are engraved on the attachment jig as an attachment jig and can be used with confidence.

As mentioned above, the present invention is easy to measure by measuring the effective diameter using a standard bolt product or a limit screw gauge, and the spherical measuring screw micrometer is suitable when the inner diameter is small. Measurement is unsuitable. Since the present invention is measurable and the dimensions are set with a digital caliper based on the standard, it is cheaper and easier to work than a screw limit gauge.

Best mode for carrying out the invention

Attach the attachment for the left attachment (1) to the outer diameter jaw (13) of the commercially available digital caliper (12), and the attachment for the right attachment (2) to the outer measurement jaw (14). The grooves (5) and (6) of the protrusions are precisely aligned and fixed with M4 bolts (17), (18), (19), and (20), respectively. It is an attachment jig that can measure the effective diameter and measure the minimum inner diameter from 10 mm, and can measure and inspect the internal thread to be processed.

Hereinafter, the present invention will be described with reference to the accompanying drawings for one embodiment (M = 64, P = 4).

FIG. 3 is a diagram showing the following procedure. The left attachment (1) is attached to the external measuring jaw (13) of the digital caliper (12), and the right attachment (2) is attached to the outer jaw (14). At the same time, after tightening with M4 bolts (17) (18) and (19) (20), respectively, the reset button (16) of the digital caliper (12) is pressed to set the counter value of the liquid crystal display (15) to zero.

FIG. 4 shows that the effective diameter of the female thread in the case of M64 and P = 4 is actually 11.4 mm for the inner diameter measurement according to the effective diameter table described in 61.4 mm (JIS standard B0207). It is necessary, and the effective diameter 61.4-18.6 = 42.8 mm is the calculated value.

In FIG. 5, in order to confirm the measured value, it is necessary that the counter value of the liquid crystal display unit of the digital caliper is returned to the state before the measurement and is set to 0.

It is a perspective view which shows the principal part of this invention. It is explanatory drawing which shows the use condition of this invention. It is a figure which shows the procedure of this invention. It is a measurement figure of the effective diameter of this invention. It is a figure which shows the measurement numerical value confirmation of this invention.

1. Attachment for left 2. 2. Right attachment 3. Angle teeth on left attachment 4. 4. Angle teeth on right attachment 5. 5. Positioning groove on left attachment 6. Positioning groove on right attachment 7. Pitch display for both attachment parts 8. M4 tap hole M4 tap hole 10. M4 tapped hole 11. M4 tapped hole 12. Digital caliper13. External diameter jaw (left)
14 Outer diameter jaw (right)
15. Liquid crystal display 16. Reset button 17. M4 bolt 18. M4 bolt 19. M4 bolt 20. M4 bolt 21. Work piece

Claims (1)

Create two parts with different shapes using special steel to make the left attachment (1) and the right attachment (2). The left attachment (1) and the right attachment (2) The main part is provided with a basic chevron based on JTS and a chevron tooth part of basic dimensions, and the left attachment (1) is attached to the outer jaw (13) of the digital caliper, and the right attachment (2) is attached to the outer jaw (14) with M4 bolts. (17) An attachment jig for measuring an effective diameter of a female screw for general machine fixed and processed in (18), (19), and (20).

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