Grinding Jig Self-Aligning Support Surface for Woodworking Tools
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional grinding machines for straight edge woodworking tools face challenges in achieving an exact 90° edge angle due to manual dependency in tool positioning, leading to potential faceted shapes or excessive material removal.
Innovation Solution
A grinding jig with a base and clamp design that includes a support surface parallel to the grindstone and adjustable security stops, ensuring the tool remains parallel to the grindstone and securely fastened, even for conical shapes, using a compression spring for alignment and beveled clamping surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If manual tightening of knobs is used to position the tool, then the jig structure is simple, but the manufacturing precision of the edge angle deteriorates
Solution Approach 1:
The support surface is designed to be self-aligning, where the geometry of the surface itself ensures that the tool face becomes parallel to the grindstone without requiring manual adjustment. The surface's physical structure automatically performs the alignment function that previously required operator skill and manual knob tightening.
Solution Approach 2:
The manual mechanical adjustment system (knobs and manual tightening) is replaced by a geometric self-alignment system. Instead of using mechanical fastening to achieve alignment, the design uses the inherent geometry of the support surface to automatically establish the correct parallel relationship between the tool and grindstone.
2Device complexity
If manual skill is required for tool positioning, then the device complexity is low, but the reliability of obtaining consistent 90° edge angle deteriorates
Solution Approach 1:
The support surface performs self-alignment automatically, eliminating dependency on operator skill. The geometry of the surface ensures consistent parallel positioning every time the tool is placed, making the process reliable and repeatable without requiring trained manual intervention.
Solution Approach 2:
The support surface is pre-designed with the correct geometric relationship to the grindstone, so that alignment is achieved automatically upon tool placement. The preliminary geometric configuration ensures that no additional adjustment is needed and that consistent 90° edge angles are obtained reliably.
3Device complexity
If conventional clamping is used, then the device complexity is low, but the reliability of secure tool fastening deteriorates
Solution Approach 1:
The clamping surface is designed with specific local geometric properties (beveled surfaces) that provide optimal contact and friction for securing the tool. The localized geometric features at the clamping interface enhance the reliability of fastening without requiring complex clamping mechanisms throughout the entire jig.
Data Source
Figure 1~2
Figure 3~5
AI summary
A grinding jig is to be used at the grinding of a straight edge woodworking tool (5) on the peripheral surface of a rotating grindstone (2) in a grinding machine (1). The grinding machine has a cylindrical support bar (3) parallel with the rotation axis of the grindstone. The jig (4) comprises a base (15), which is parallel with the support bar (3) and is intended for slidable and rotational mounting on the support bar (3), and a clamp (16), wherein the tool (5) is attached between the base and the clamp. The grinding jig has a support surface (15A) on the base (15) for supporting the face of the tool (5) opposite its bevel.