Rifle Scope Mount Bore Machining for Precise Tube Alignment
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Solution Overview
Problem
Existing methods for manufacturing rifle scope mounts lack precision, which is essential for mounting sophisticated optics and accessories on firearms.
Innovation Solution
A method involving forming and connecting mount portions, clamping to a fixture, and machining to define a cylindrical bore, with features like shims and registration pins for precise alignment and interference fits, ensuring accurate mounting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional manufacturing methods are used for rifle scope mounts, then manufacturing simplicity is maintained, but manufacturing precision deteriorates
Solution Approach 1:
The scope mount is divided into multiple separate portions (first mount portion, second mount portion) that are formed independently and then connected. This segmentation allows each portion to be manufactured with high precision using conventional methods, while the overall assembly achieves superior cylindrical bore precision through the connection process and fixture-based alignment.
Solution Approach 2:
The mount portions are formed and connected to the fixture before the final machining operation. This preliminary action establishes precise positioning and alignment early in the process, allowing the subsequent machining of the cylindrical bore to be performed with high precision on a stable, pre-positioned assembly rather than attempting to machine the entire bore in one operation on a single piece.
2Measurement precision
If single-piece scope mounts are manufactured, then structural simplicity is maintained, but alignment precision deteriorates
Solution Approach 1:
A fixture serves as an intermediary element that receives and precisely positions multiple mount portions during the machining process. The fixture acts as a mediator that enables high-precision alignment of the separate mount portions without requiring complex manufacturing of each individual component, as the fixture provides the reference framework for accurate positioning.
Solution Approach 2:
The scope mount is segmented into multiple portions that can be manufactured using simpler, more economical processes. These separate portions are then connected with high precision through the fixture-based assembly process, achieving alignment precision that would be difficult to obtain in a single-piece manufacturing approach while maintaining ease of manufacture for each individual portion.
3Manufacturing precision
If precision machining is performed on connected mount portions, then cylindrical bore precision is improved, but process complexity increases
Solution Approach 1:
The mount portions are connected to the fixture before the precision machining operation. This preliminary action of assembly and fixation allows the subsequent cylindrical bore machining to be performed with high precision in a single operation on the already-positioned assembly, rather than requiring multiple separate machining operations on individual components that would then need to be assembled. This improves productivity by reducing the number of operations while maintaining high precision.
Solution Approach 2:
Multiple mount portions are connected and positioned on a common fixture, merging them into a single assembled unit that is then machined as one piece. This combining approach allows the cylindrical bore to be machined with high precision across the entire assembly in a single operation, improving manufacturing efficiency compared to machining each portion separately and then assembling them with alignment challenges.
Data Source
AI summary
A method of manufacturing a rifle scope mount has the steps of forming a first mount portion defining a first portion of a cylindrical scope tube passage, forming a second mount portion defining a second portion of the cylindrical scope tube passage, after forming the first and second mount portions, connecting the first and second mount portions together, connecting the first and second mount portions to a fixture, and after connecting the first and second mount portions to a fixture, machining the first and second mount portions to define a cylindrical bore at the cylindrical scope tube passage. The step of connecting the first and second mount portions together may include positioning a shim between the first and second mount portions. The step of connecting the first and second mount portions to a fixture may include clamping the first mount portion to a fixture rail.