Boring Head Scale Geometry for Parallax-Free Side Reading
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Solution Overview
Problem
Existing boring heads obstruct the view of graduation marks, making precise positioning difficult due to blocked sightlines and potential parallax errors when mounted in machines.
Innovation Solution
A boring head design featuring a convexly rounded bevel surface for the scale, allowing a perpendicular view of graduation marks from the side, reducing parallax errors and improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the scale surface is made flat and perpendicular to the micrometer screw axis, then the structure is simple and easy to manufacture, but the view of graduation marks is obstructed when mounted in machines, causing parallax errors and making accurate reading difficult
Solution Approach 1:
The scale surface is designed as a convexly rounded bevel surface instead of a flat surface. This curvature allows the graduation marks to be viewed from multiple angles without parallax error, as the rounded surface presents the marks perpendicular to the line of sight regardless of the viewing angle. The bevel shape with specific angular orientation enables accurate reading while maintaining structural simplicity.
Solution Approach 2:
The scale surface is oriented at a bevel angle relative to the micrometer screw axis, transitioning from a conventional flat perpendicular arrangement to an angled configuration. This dimensional change in orientation allows the graduation marks to be accessible from the side of the boring head, enabling unobstructed viewing when mounted in machine tools while maintaining manufacturing simplicity.
2Measurement precision
If the operator looks along the axis of the micrometer screw to read the scales, then the reading is accurate without parallax error, but the view is blocked when the boring head is mounted in a machine
Solution Approach 1:
The scale surface is positioned at a bevel angle to the micrometer screw axis, allowing readings to be taken from a direction perpendicular or at an angle to the screw axis rather than along it. This repositioning in a different spatial dimension enables the operator to read the scales from the side of the boring head, avoiding obstructions while maintaining accuracy through proper angular alignment.
Solution Approach 2:
The convexly rounded bevel surface of the scale ensures that the graduation marks are always presented perpendicular to the line of sight, regardless of the viewing angle. This curvature allows accurate reading from side views without requiring the operator to look along the micrometer screw axis, eliminating parallax errors while improving accessibility.
3Ease of operation
If the scale surface is positioned for side viewing, then the view is accessible when mounted in machines, but parallax errors occur when viewing from an angle
Solution Approach 1:
The convexly rounded bevel surface is specifically designed so that the graduation marks are always oriented perpendicular to the line of sight from any viewing angle. This curvature compensates for angular viewing positions, ensuring that the marks appear sharp and accurate without parallax distortion, thereby maintaining reading precision while enabling side viewing accessibility.
Data Source
Figure 1
Figure 2~2b
Figure 3a~4
AI summary
The present invention realties to a boring head for holding a boring tool for metal cutting. The boring head comprises a main body, which comprises a support surface (25) and a scale surface. The boring head further comprises a piston (6) comprising a boring tool interface for fixedly carrying the boring tool, wherein the piston (6) is movably arranged in the main body along the positioning axis (y), and a micrometer screw (19). The micrometer screw (19) is arranged in the main body and coupled to the piston (6), such that, when the micrometer screw (19) is rotated, the piston (6) is moved along the positioning axis to one of the protracted positions or the retracted position. The micrometer screw (19) comprises a head (21) abutting against the support surface (25), which head (21) comprises a radially outer head surface (26) provided with first graduation marks (23). The scale surface is provided with second graduation marks (29), which second graduation marks (29) align with the first graduation marks (23) to provide a reading of the axial position of the piston (6). The scale surface is a convexly rounded bevel surface (28) with an arc-shaped edge (32) at the head surface (26).