Grinding Angle Bubble Level Jig for Consistent Bevels
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Solution Overview
Problem
Craftsmen face difficulties in maintaining consistent angles when grinding beveled surfaces by hand, requiring significant skill and experience to achieve symmetrical and precise results, especially when grinding bilateral bevels.
Innovation Solution
A jig incorporating a bubble or spirit level that can be adjusted to index a workpiece to a horizontal reference plane, allowing the user to maintain a predetermined angle relative to a grinding tool, ensuring consistent bevel angles without relying on the tool's moving surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a craftsman manually holds the workpiece against the grinding belt by hand, then the operation is simple and requires no additional equipment, but the angle consistency and manufacturing precision deteriorate due to lack of skill and experience
Solution Approach 1:
The patent introduces a jig as an intermediary device between the craftsman and the workpiece. The jig incorporates a bubble level that serves as a mediator to provide visual feedback about the workpiece angle, enabling the craftsman to maintain consistent angles without requiring years of experience. The jig acts as a bridge that translates the abstract concept of 'correct angle' into concrete visual guidance through the bubble level indicator.
Solution Approach 2:
The patent replaces the reliance on human sensory-motor skills (mechanical control through hand-eye coordination and muscle memory) with a visual feedback system. Instead of depending on the craftsman's ability to feel and judge angles through years of practice, the system substitutes this mechanical skill-based control with optical feedback from the bubble level, making precision accessible to less experienced users.
2Manufacturing precision
If a craftsman relies on years of experience to maintain grinding angles, then the angle control improves, but the learning time and device complexity increase
Solution Approach 1:
The jig performs self-service by providing its own guidance system. The bubble level automatically indicates whether the workpiece is at the correct angle without requiring external intervention or expert judgment. The system serves itself by using gravity and the bubble's natural tendency to seek the highest point to provide continuous, objective feedback about angle correctness, eliminating the need for expert oversight.
Solution Approach 2:
The patent implements a real-time feedback loop where the bubble level continuously provides visual information about the workpiece angle to the craftsman. This feedback mechanism allows the craftsman to immediately see deviations from the desired angle and make corrective adjustments, creating a closed-loop control system that replaces the need for experienced judgment with automated visual guidance.
3Manufacturing precision
If a bubble level jig is introduced to maintain grinding angles, then the manufacturing precision and angle consistency improve, but the device complexity increases
Solution Approach 1:
The patent divides the jig into distinct functional segments: the base that contacts the grinding belt, the vertical support structure, the adjustable workpiece holder, and the bubble level assembly. This segmentation allows each component to perform its specific function independently and enables easy adjustment or replacement of individual parts without affecting the entire system, thereby managing complexity through modular design.
Solution Approach 2:
The jig is designed with universal features that allow it to accommodate different workpiece sizes and types while maintaining the same angle control functionality. The adjustable holder and standardized bubble level mounting suggest that a single jig design can serve multiple grinding applications, reducing the need for multiple specialized tools and justifying the added complexity through versatility.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables craftsmen to easily and accurately maintain consistent bevel angles, reducing the need for extensive experience and skill, and ensuring reproducibility in grinding operations, particularly for producing symmetrical knife blades.
Implementation Method 1
The jig incorporates a bubble or spirit level, which may be adjusted to a desired setting
Implementation Method 2
Relying upon that setting enables the user to index the workpiece to a hypothetical horizontal reference plane
Data Source
AI summary
Method of and apparatus for indexing a workpiece to a tool at a predetermined angle of orientation, using a bubble level to establish a horizontal reference plane. The bubble level may be pivotally fixed to a housing of a jig which may incorporate a magnet for adhering the housing to a magnetically responsive workpiece. The bubble level may be secured at a particular pivotal orientation such that when the workpiece is held against the cutting or abrading surface of a tool, the workpiece may be manually maintained at the predetermined angle of orientation such that a ground surface disposed at a predetermined angle on the workpiece may be formed while holding the workpiece manually. The jig may incorporate an adjustable leg to assist in tightening the bubble level at the particular pivotal orientation.