Digital caliper for groove inside grooveless round rod

Abstract

The invention discloses a new structure of a digital caliper for a groove inside a grooveless round rod and belongs to the field of precision machining. The technical characterics of the digital caliper for the groove inside the grooveless round rod are as shown in figure 1. A back surface of a main scale (2) is grooveless; a plane is processed into a semicircle on one end of the round rod (5) andis as shown in figure 3; the end is embedded into a semicircular groove of a scale frame (7) and is welded by argon arc welding; the semicircular groove has a rotationally-fixed function and facilitates unloosening of the round rod (5) when a groove measurement head is mounted and dismounted; a gap of 0.1-0.2 mm is kept between the round rod (5) and the main scale (2) during measurement; the round rod (5) directly extends into a measurement seat hole for movement; symmetrical steps are processed on one end of the main scale (2); the end of the main scale (2) is in interference fit with a measurement seat (4); and in order to reduce the shaking amount of the round rod (5), a fit clearance between the measurement seat (4) hole and the round rod (5) is reduced from the conventional 0.3 mm to0.1 mm. according to the digital caliper for the groove inside the grooveless round rod disclosed by the invention, the digital display component (3) is changed to increase to the right and is universal to digital display components of various types of digital calipers.

Description

Technical field: [0001] The invention relates to a new structure of a digital caliper with grooves inside the depth of a grooveless round rod, which belongs to the field of precision machining. Background technique: [0002] Groove digital calipers in the known conventional round bar depth, such as figure 2 show its defects; [0003] 1. The moving feeling is not good. There is an impassable groove on the back of the main ruler (5). The frames are connected with fastening screws (8). When the ruler frame (11) is moved for measurement, the round bar (2) moves along with the ruler frame (11) in the groove of the main ruler (5) and the hole of the measuring seat (3). The groove of the ruler (5), the connecting plane of the measuring seat (3) and the cumulative error of the symmetry parallelism of the hole processing, when measuring, the garden rod (2) often rubs against the groove of the main ruler (5) and the hole of the measuring seat (3) , will directly affect the feel whe...

AI Technical Summary

Problems solved by technology

[0003] 1. The moving feeling is not good. There is an impassable groove on the back of the main ruler (5). The frames are connected with fastening screws (8). When the ruler frame (11) is moved for measurement, the round bar (2) moves along with the ruler frame (11) in the groove of the main ruler (5) and the hole of the measuring seat (3). The groove of the ruler (5), the connecting plane of the measuring seat (3) and the cumulative error of the symmetry parallelism of the hole processing, when measuring, the garden rod (2) often rubs against the groove of the main ruler (5) and the hole of the measuring seat (3) , will directly affect the feel when the ruler frame (11) moves and measures;

[0004] 2. The round rod (2) shakes a lot. In order to improve the feel, the groove is often widened and the hole is enlarged to meet the moving feel. However, if the groove width and aperture are enlarged, the shake of the round rod (2) will increase, which directly affects The measurement indication error is eliminated;

[0005] 3. The reliability of the connection is unstable. Since the main ruler (5) and the measuring base (3), the ruler frame (11) and the round rod (2) are respectively connected by screws, a slight collision during transportation or use is prone to loosening. Affect the stability of measurement accuracy, so the quality stability of conventional products is not ideal

[0006] 4. The digital display component is not universal, and now it is increasing to the left, while the general digital caliper component is increasing to the right

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