Modular Lower Receiver Jig With Centering for Precise Machining
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Solution Overview
Problem
Conventional machining jigs for firearm lower receivers are limited in versatility, requiring separate tools for different types and sizes of blanks, and often suffer from improper alignment issues that can damage the blanks during machining.
Innovation Solution
A modular machining tool assembly that includes side plates, a template plate, a centering mechanism, and a guide insert, allowing for the same assembly to be used with various firearm blanks by adjusting orientations and attachments, ensuring proper alignment and machining of different caliber and size blanks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional jigs are configured for one particular type of lower receiver blank, then machining precision for that specific blank is improved, but adaptability to different blanks deteriorates
Solution Approach 1:
The jig is designed with a universal base structure that can accommodate multiple types of lower receiver blanks (AR-15, AR-10, etc.) through interchangeable components. The template plate system allows the same jig to perform multiple functions for different blank types, achieving both precision and adaptability.
Solution Approach 2:
The jig is divided into modular components including a base structure, interchangeable template plates, and adjustable positioning mechanisms. This segmentation allows users to swap template plates for different blank types while maintaining the stable base structure, resolving the contradiction between specialization and versatility.
2Adaptability or versatility
If multiple separate jigs are purchased for different blank types, then adaptability is improved, but device complexity and cost increase
Solution Approach 1:
The jig consolidates multiple specialized jigs into a single universal system. By using interchangeable template plates and adjustable components, one jig can replace several dedicated jigs, reducing overall device complexity and cost while maintaining adaptability across different blank types.
Solution Approach 2:
The invention merges the functions of multiple separate jigs into a single integrated system. The universal base structure combines with interchangeable template plates to provide the functionality of multiple specialized jigs in one device, simplifying the overall system.
3Device complexity
If conventional jigs lack proper alignment mechanisms, then device complexity is reduced, but reliability and risk of blank damage increase
Solution Approach 1:
The jig incorporates preliminary alignment features such as positioning pins, registration holes, and template alignment mechanisms that automatically align the blank with the machining tools before the machining process begins. This preliminary action ensures proper positioning without adding significant complexity to the overall device.
Solution Approach 2:
Alignment pins and registration features act as intermediary elements between the blank and the jig structure. These intermediaries facilitate precise positioning and alignment, improving reliability while adding minimal complexity to the system.
4Adaptability or versatility
If a single universal jig is used for all blank types, then adaptability is improved, but manufacturing precision for specific blank types may deteriorate
Solution Approach 1:
The universal jig uses segmented, interchangeable template plates that can be swapped depending on the blank type. Each template plate is optimized for specific blank types, ensuring high manufacturing precision while the overall system maintains adaptability through the modular template selection system.
Solution Approach 2:
Different template plates provide locally optimized features for specific blank types. Each template plate has geometry and features tailored to its intended blank type, ensuring high precision for that specific application while the universal jig maintains adaptability through the variety of available templates.
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.