Lower Receiver Jig Assembly for Router-Based Precision Machining
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Solution Overview
Problem
Customers attempting to finish manufacturing 80% completed AR-15 lower receivers face challenges in accurately completing the final 20% of machining without access to expensive and complex milling machines, often resulting in frustration and damaged components due to the difficulty of using a drill press for milling operations.
Innovation Solution
A novel jig assembly that allows the use of a router, incorporating integrated depth settings and fixturing holes, enabling precise machining without the need for a mill or drill press, and featuring interchangeable templates and depth indicators for accurate depth control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If customers use a drill press for milling operations to complete the final 20% of lower receiver machining, then they can perform the machining without expensive milling machines, but the machining accuracy deteriorates and user error increases
Solution Approach 1:
The patent introduces a router as an intermediary tool between the drill press and the milling operation. The router, when used with the specialized jig assembly, enables accurate milling operations without requiring expensive dedicated milling machinery. The jig acts as a mediator that adapts the router's capabilities to perform precise milling functions.
Solution Approach 2:
The patent employs a relatively inexpensive router instead of expensive, durable milling machines. The router is a more affordable, versatile tool that can be used for this specific application without requiring the customer to invest in costly, specialized equipment. The jig assembly enables this cheaper tool to achieve precision comparable to expensive machinery.
2Ease of operation
If customers attempt to perform precise machining operations without proper fixturing and depth control, then they can simplify the setup process, but the machining precision and reliability deteriorate
Solution Approach 1:
The jig assembly incorporates pre-configured depth indicators and stop features that are built into the structure. These preliminary provisions for depth control eliminate the need for complex setup procedures while ensuring consistent, accurate depth control during machining operations. The depth indicators are pre-set to provide reliable stopping points.
Solution Approach 2:
The jig assembly includes self-aligning features and built-in depth control mechanisms that automatically guide the router bit to the correct depth without requiring operator intervention or complex measurement procedures. The system serves itself by providing inherent guidance and control features that ensure reliable machining.
3Adaptability or versatility
If customers use interchangeable templates with the jig assembly, then they can complete different machining operations with one tool, but the device complexity increases
Solution Approach 1:
The jig assembly is designed with universal compatibility to accept multiple interchangeable templates, each configured for different machining operations. This multi-functionality allows a single jig base to perform various machining tasks by simply changing the template, eliminating the need for multiple specialized jigs for different operations.
Data Source
AI summary
A machining tool assembly for manufacturing a firearm lower receiver includes a first and second side jig which are configured to be disposed on opposite sides of the firearm lower receiver and configured to removably attach to one another securing the firearm lower receiver therebetween. A drill block jig is removably attachable to the first and second side jigs disposed above the top surface of the firearm lower receiver, wherein the drill block jig has at least one through hole. A router support plate is disposed above and removably attachable to the first and second side jigs. A router aperture is disposed through a router support plate thickness.