Lower Receiver Jig Assembly With Interchangeable Alignment Guides
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Solution Overview
Problem
Conventional machining jigs for firearm lower receivers are typically designed for specific types of blanks, requiring separate jigs for different platforms, sizes, and calibers, and often suffer from alignment issues that can damage the blanks during machining.
Innovation Solution
A versatile machining tool assembly that includes a pair of side plates with interchangeable apertures, a template plate with a template aperture and depth gauges, and a centering mechanism, allowing the same assembly to be used for machining different lower receiver blanks by simply rotating the side plates and adjusting the centering mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional jigs are designed for specific types of blanks, then machining precision for that specific type is improved, but the number of different jigs required increases
Solution Approach 1:
The jig is designed with interchangeable components including multiple template plates with different aperture patterns, various side plates with different aperture configurations, and adjustable centering mechanisms. These components can be swapped to accommodate different blank types (AR-15, AR-10, etc.), allowing a single jig base structure to perform multiple machining functions across different firearm platforms while maintaining precision for each specific blank type
2Loss of time
If conventional jigs are used without adjustable centering, then alignment speed is improved, but alignment accuracy deteriorates
Solution Approach 1:
The jig incorporates pre-configured centering mechanisms including centering blocks and adjustable centering devices that are prepared in advance. These components provide predetermined centering positions and alignment references that can be quickly engaged, eliminating the need for time-consuming manual alignment while ensuring accurate positioning of the blank relative to the template apertures and machining paths
3Device complexity
If conventional jigs lack alignment verification, then device complexity is reduced, but the risk of blank damage increases
Solution Approach 1:
The jig includes alignment verification features such as visible alignment marks, indicator devices, and verification apertures that provide feedback on the correct positioning of the blank. These feedback mechanisms allow the operator to verify proper alignment before machining begins, preventing damage to the blank while adding minimal complexity to the overall jig structure
Data Source
AI summary
A machining tool assembly is provided for machining a blank to form a firearm lower receiver. The assembly includes a pair of side plates positionable on opposed sides of the blank to capture the blank therebetween. A template plate having a template aperture is adapted to be removeably attachable to the side plates. The template aperture is aligned with a top surface of the blank and is adapted for machining a cavity within the blank having a peripheral contour complimentary to a peripheral contour of the template aperture. A centering mechanism is adapted to be removeably attachable to the template plate, with the centering mechanism including an opening aligned with a corresponding void formed on the blank to align the blank with the template plate.