Firearm Jig Adjustable Alignment Mechanism
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Solution Overview
Problem
Existing jigs for machining firearm lower receiver blanks often suffer from manufacturing defects such as uneven wall thickness and misaligned holes due to manufacturing tolerances, leading to suboptimal machining results.
Innovation Solution
The introduction of an adjustable alignment mechanism, a hand drill stabilizer, and a guide insert within the jig, which includes a threaded knob for precise alignment, extended drill apertures for stability, and a chip slot for efficient chip removal, respectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If existing jigs are used to machine lower receiver blanks, then the manufacturing process can be completed, but manufacturing defects such as uneven wall thickness and misaligned holes occur due to slop or looseness in the jig
Solution Approach 1:
The alignment mechanism transitions from a static, fixed-position system to a dynamic, adjustable system. The alignment bar can be positioned at multiple locations along the buffer tube, and the clamping mechanism allows for adjustable pressure application. This dynamic adaptability enables the jig to compensate for variations in blank geometry and achieve consistent alignment across different manufacturing runs, thereby improving both machining accuracy and result consistency.
Solution Approach 2:
The invention changes the physical parameters of the alignment system by introducing an adjustable alignment bar with variable positioning along the buffer tube. This allows modification of the alignment parameters to match different blank tolerances and geometries. By adjusting the position and clamping force parameters, the system can eliminate slop and ensure consistent alignment, directly addressing the contradiction between achieving high machining precision and maintaining reliable, repeatable results.
2Adaptability or versatility
If manufacturing tolerances of the lower receiver blank are accommodated, then assembly flexibility is improved, but angular misalignment occurs allowing the blank to be assembled at an angle
Solution Approach 1:
The alignment mechanism performs preliminary alignment action before the machining process begins. The alignment bar is positioned and clamped to the buffer tube in advance, establishing a precise reference plane that prevents angular misalignment during subsequent machining operations. This preliminary action ensures that even though the blank has manufacturing tolerances, it is pre-aligned correctly, eliminating the angular misalignment problem while still accommodating normal tolerance variations.
Solution Approach 2:
The alignment bar acts as an intermediary element between the jig structure and the lower receiver blank. It mediates the connection by providing a stable reference surface that interfaces with the buffer tube, translating the jig's positioning into accurate alignment of the blank. This intermediary mechanism allows the system to accommodate blank tolerances while maintaining precise alignment, resolving the contradiction between adaptability and precision.
3Ease of manufacture
If the jig structure is simplified to reduce complexity, then ease of manufacture is improved, but alignment stability deteriorates leading to slop or looseness
Solution Approach 1:
The alignment mechanism is segmented into distinct functional components: the alignment bar, the clamping mechanism, and the buffer tube interface. This segmentation allows each component to be manufactured independently using simple processes, maintaining ease of manufacture.同时, the modular segmented structure enables precise adjustment and stable alignment, as each segment can be optimized for its specific function without complicating the overall jig construction.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
These features ensure accurate and even machining by preventing angular misalignment and improving drill bit stability, resulting in higher quality finished lower receivers with reduced defects.
Implementation Method 1
By screwing down the threaded knob it applies equal pressure across the top of the receiver blank. This causes the lower receiver to 'self level' in the jig.
Implementation Method 2
The chip slot can be adapted to remove chips from the pilot hole forming aperture during drilling of the top surface.
Data Source
AI summary
A jig for machining portions a firearm lower receiver blank. The jig can include a side plate assembled with a top plate. The top plate can include an access aperture for machining the fire control group aperture within the blank. The side plate can include drill apertures for drilling out trigger, hammer, and selector holes. The jig can include an adjustable alignment mechanism for aligning a top surface of the blank with the top plate. The jig can include a hand drill stabilizer for attachment with the side plates.