Interchangeable Chamfer Gage Anvils for Wider Hole and Angle Measurement
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Solution Overview
Problem
Current chamfer gages are limited in size range due to fixed anvils and sharper angles, leading to inaccurate measurements and a restricted range of hole sizes.
Innovation Solution
A chamfer gage with interchangeable anvil assemblies, allowing for a greater range of measurement and enabling the user to check multiple part features with one instrument.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed anvils are used in chamfer gages, then the structure is simple and stable, but the measurement range is limited to the diameter of the anvil
Solution Approach 1:
The anvil is divided into two separate components: an anvil body and an anvil holder. The anvil body contains the measurement feature (chamfer angle and diameter), while the anvil holder provides mounting and attachment functionality. This segmentation allows the anvil body to be easily swapped between holders, extending the measurement range without requiring a completely different gage structure.
Solution Approach 2:
The anvil is designed with a threaded hole that accepts a threaded rod for attachment to the anvil holder. This dynamic attachment mechanism allows the anvil to be quickly removed and replaced with different anvils having various diameters and angles, transforming the fixed structure into a flexible, adaptable system.
2Adaptability or versatility
If one-piece indicator and anvil bodies are used, then the structure is rigid and stable, but the range of hole sizes is limited
Solution Approach 1:
The gage is segmented into three main components: the indicator body, the anvil holder, and the anvil body. This segmentation allows independent replacement of the anvil body while keeping the indicator and holder, enabling measurement of various hole sizes with a single gage unit.
Solution Approach 2:
The anvil holder is designed with a universal mounting interface that can accommodate multiple anvil bodies with different diameters and angles. This universal design allows one holder to serve multiple measurement functions, effectively making the gage multi-functional for measuring different hole sizes.
3Adaptability or versatility
If sharper angle anvils are used, then the gage structure is compact, but the measurement range of chamfer angles is limited
Solution Approach 1:
The anvil system transitions from a fixed, static configuration to a dynamic, interchangeable system. Users can select and swap anvils with different angles (e.g., 45°, 60°, 90°, 135°) based on the measurement requirements, thereby expanding the measurable chamfer angle range while maintaining a compact overall gage structure.
4Measurement precision
If three-blade method is used for measurement, then the gage structure is simple, but measurement accuracy is reduced due to incomplete contact
Solution Approach 1:
The anvil body is designed with specific local geometries (flat surfaces, angled faces, and curved surfaces) that are optimized for different measurement scenarios. These locally tailored surfaces ensure full and accurate contact with the workpiece feature being measured, improving measurement precision compared to generic three-blade designs.
Data Source
AI summary
Applicant has disclosed a chamfer gage with interchangeable anvil assemblies which can measure the diameter of chamfered holes and the chamfer angle (up to 135°). In the preferred embodiment, the chamfer gage comprises: an indicator housing; a compression fitting, attached to the housing, for securing an indicator spindle for movement inside the housing; and an interchangeable anvil assembly, having an anvil body with a depressible anvil or plunger inside, which can be detachably connected to the indicator housing by a threaded thumb ring rotatably mounted on the housing. Another interchangeable anvil assembly can be swapped within thirty seconds to measure the chamfer of a different hole size.