Joinery Jig with Common Datum and Spacers for Accurate Mitre Cuts
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Solution Overview
Problem
Existing joinery jigs are inadequate for accommodating beveled edges with varying radii and rely on different datum points for male and female mitre cuts, leading to inaccurate joint alignment when workpieces have non-standard widths.
Innovation Solution
A joinery jig with a body featuring a continuous elongate angled channel, datum alignment elements, and spacers that allow alignment with a common datum point for accurate mitre cuts on workpieces with different bevel radii, using spacers to maintain consistent positioning for precise cuts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different datum points are used for male and female mitre cuts, then the jig can accommodate standard workpiece widths, but the joint alignment becomes inaccurate when workpieces have non-standard widths
Solution Approach 1:
The jig is designed with a single common datum point that serves both male and female mitre cut operations, making it universally applicable to workpieces of any width. The adjustable spacer system allows the same datum point to accommodate varying workpiece dimensions while maintaining accurate joint alignment, eliminating the need for different datum points for different cut types.
Solution Approach 2:
The spacer elements are made adjustable and interchangeable rather than fixed, allowing the jig to dynamically adapt to different workpiece widths. The spacers can be repositioned along the datum line to maintain the correct cutting angle and depth regardless of the workpiece dimension, ensuring consistent precision across various sizes.
2Manufacturing precision
If the jig is designed for a specific bevel radius (e.g., 35 mm), then it provides precise cuts for that radius, but it cannot accommodate workpieces with different bevel radii
Solution Approach 1:
The jig incorporates adjustable parameters including the bevel radius setting through interchangeable or repositionable guide elements. The datum alignment elements and spacers can be adjusted to accommodate different bevel radii (3 mm, 5 mm, 10 mm, 24 mm, 35 mm, or other radii), allowing the same jig to maintain precise cuts across varying workpiece geometries by changing the relevant dimensional parameters.
Solution Approach 2:
The jig is divided into modular components including separate spacer elements and datum alignment features that can be independently adjusted or replaced. This segmentation allows specific parts to be modified for different bevel radii without redesigning the entire jig, maintaining precision while improving versatility.
3Device complexity
If the jig assumes uniform workpiece width, then the structure remains simple, but the joint alignment becomes inaccurate for non-standard widths
Solution Approach 1:
The spacer elements act as intermediary components between the fixed jig structure and the variable workpiece dimensions. These spacers absorb the dimensional variations in workpiece width while maintaining the correct positioning and orientation of the cutting tool, thus preserving joint alignment accuracy without requiring complex adjustable mechanisms throughout the entire jig.
Data Source
AI summary
A joinery jig comprising a body and a plurality of spacers, wherein the body defines (i) a first straight slot, a second straight slot and an angled slot, wherein the angled slot connects the first straight slot to the second straight slot to define an elongate angled channel; (ii) a plurality of datum alignment elements aligned with the angled slot, wherein each datum alignment element is spaced from a reference point of the angled slot by a pre-determined distance; and (iii) at least one spacer receiving aperture; and wherein the number of spacers is equal to the number of datum alignment elements and each spacer includes a body having a dimension which is equal to the pre-determined distance defined between a respective one of the datum alignment elements and the reference point of the angled slot; and wherein each spacer includes a body portion which fits within the or one of the spacer receiving apertures.