Adjustable Arm Circle Compass for Precision Router Cutting
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Solution Overview
Problem
There is a need for a circle compass that can accurately form small circular holes and plugs with routers, as existing tools are inadequate for precision in these sizes due to the size limitations of the router itself.
Innovation Solution
A circle compass with a main body and adjustable arm, featuring a central receiving aperture for the router bit, an adjustable arm with a centering pin, and scales for indicating hole and plug sizes, allowing for infinite adjustment between retracted and extended positions to accommodate diameters from 0.75 inches to 12 inches, ensuring accurate circular cuts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a traditional circle compass is used for routing, then large circular holes and plugs can be formed, but small circular holes and plugs cannot be accurately formed due to the size limitations of the router itself
Solution Approach 1:
The compass arm is made adjustable and movable along the scale, allowing dynamic repositioning to accommodate different router sizes and desired hole diameters. This enables the same device to accurately form both small and large circular holes by changing the arm position rather than requiring different fixed-size tools
Solution Approach 2:
The invention changes the key parameter of the compass arm position relative to the router base, allowing continuous adjustment of the effective radius. By varying this geometric parameter, the system can adapt to form circles of different sizes while maintaining manufacturing precision across the entire range from small to large holes
2Adaptability or versatility
If the adjustable arm is extended to increase the maximum hole diameter, then the range of hole sizes increases, but the minimum hole size that can be formed increases as well
Solution Approach 1:
The compass arm is divided into segments that can be independently adjusted and repositioned. This segmentation allows the user to configure the arm length and position to optimize for either small or large hole formation, decoupling the minimum and maximum size capabilities from a fixed geometric configuration
3Manufacturing precision
If the router base size is reduced to enable small hole formation, then small circular holes can be accurately formed, but the router cannot accommodate larger cutting capacities
Solution Approach 1:
The router base is designed with universal adaptability to work with routers of various sizes and types. The base accommodates different router shanks and configurations, allowing a single base design to support both small precision work and larger cutting operations by adapting to the specific router being used rather than limiting the router selection
Data Source
AI summary
A circle compass is provided. The circle compass includes a main body attachable to a router and an adjustable arm. The main body includes a central receiving aperture configured to receive a router bit or shaft therethrough. The adjustable arm is slidably attached to the main body and has a centering pin. The centering pin extends axially outward beyond a bottom side of the main body. The adjustable arm is slidable along an adjustment axis between a retracted position being associated with a smallest hole that can be formed and an extended position being associated with the largest hole that can be formed. The adjustable arm includes a clearance slot that at least partially aligns with the central receiving aperture of the main body through which the rotating portion of the router must extend to form a cut in the work piece.