Lower Receiver Jig Assembly for Accurate Rotary Tool Guidance
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Solution Overview
Problem
The completion of 80% firearm lower receivers is time-consuming and prone to poor quality due to the existing techniques, which often involve placing a rotary power tool too far from the receiver and in direct contact with guiding features, leading to premature wear and inaccurate results.
Innovation Solution
A jig assembly that reduces the distance between the rotary power tool and the lower receiver, using a guide plate and carriage system to guide the tool without direct contact with guiding features, ensuring accurate and repeatable machining by an unskilled user.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a rotary power tool is placed too far from the lower receiver, then the tool can operate with more clearance, but the machining precision and quality deteriorate
Solution Approach 1:
The patent introduces a guide plate as an intermediary component between the rotary power tool and the lower receiver. The guide plate provides a stable reference surface and guiding features that enable the tool to maintain precise positioning and orientation during machining operations, thereby achieving high machining accuracy while allowing adequate tool clearance.
2Manufacturing precision
If the rotary power tool is placed in direct contact with guiding features, then the tool can be guided accurately, but the guiding features experience premature wear
Solution Approach 1:
The guide plate serves as a mediator that transfers guidance functions without requiring direct contact between the rotary power tool and the guiding features of the lower receiver. The guide plate's guiding features interface with the tool, while the lower receiver's guiding features interface with the guide plate, distributing wear and protecting the critical receiver features.
Solution Approach 2:
The guidance system is segmented into multiple components: the lower receiver has guiding features, the guide plate has its own guiding features that interface with both the receiver and the tool. This segmentation allows wear to occur on the guide plate rather than on the receiver, preserving the durability and precision of the receiver's guiding features.
3Manufacturing precision
If additional components are added to reduce tool distance and improve guidance, then machining precision improves, but device complexity increases
Solution Approach 1:
The guide plate is designed as a multi-functional component that simultaneously provides: (1) a stable mounting surface for the rotary power tool, (2) guiding features for accurate tool positioning, (3) support for locating pins to define receiver orientation, and (4) a reference surface for maintaining consistent tool distance. By consolidating multiple functions into a single component, the patent improves machining precision without proportionally increasing device complexity.
Data Source
AI summary
An improved jig for manufacturing a firearm lower receiver is comprised of a power tool mount; an adapter; a guide plate with plate screws; a rear support with mounting screws; a front support; and at least one of a carriages with at least one locating pin. A guide plate is disposed below the top surface of a lower receiver in conjunction with an adapter. The jig is a universal fitment and includes a bearing to support a rotary tool and at least one guiding feature can be used to facilitate in the guidance of the rotary tool without placing the rotary tool in direct contact with any of the guidance features. A removable locating pin is situated a long the front and rear takedown pin holes of a firearm receiver that is not threaded and is provided with at least one of a pull, string or other handle.