Fixture Plates for machining an AR15 80% lower receiver
thingiverse
These fixture plates are engineered to manufacture softjaws that permit secure gripping of an 80% AR15 lower receiver for machining the trigger group pocket. They can also, depending on production parameters, offer guide bushings for drilling out the three trigger group holes. Designed using AutoDesk Inventor 2014, those interested in modifying these files have access to the original code. Additionally, IGES files are provided, making them compatible with most CAD software, including FreeCAD. Instructions for 3D printing: To print these fixture plates, users must first scale the STL files up by 25.4, as they are specified in inches. Furthermore, the plates should be rotated so that the Y-axis aligns 'up' on the machine. Once printed, they do not require additional support; however, a dense build material and thick shells (at least 1-2mm) are recommended for durability. A fill density of at least 50% is also suggested to ensure optimal results. Important: when using these plates as a machining fixture, two alignment pins are required to register them with the AR15's takedown holes.
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