Integral String Instrument Body CNC Machined Aluminum
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Solution Overview
Problem
Conventional stringed instruments constructed from wood or other materials suffer from instability, tonal variations, and increased production time due to separate components and complex assembly processes, while metal instruments face issues with density variations and precise curvature requirements.
Innovation Solution
A stringed instrument with an integral unitary structure made from non-wood rigid material, such as aluminum, using CNC machining for high precision, featuring an interconnected network of cavities for enhanced resonance and sustain, and a metal fingerboard with integrally formed frets for interchangeable curvature and positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional stringed instruments are constructed from wood or other materials with separate components, then manufacturing flexibility and traditional craftsmanship are maintained, but structural stability and tonal consistency deteriorate due to deformation from use, temperature changes, and erosion
Solution Approach 1:
The patent merges multiple separate components (body, neck, head, fingerboard, bridge) into a single integral unitary structure manufactured from one block of rigid non-wood material. This eliminates the need for assembly joints and permanent mounting, thereby resolving the contradiction by improving structural stability through integration while the CNC manufacturing process manages the complexity of creating the unified structure.
Solution Approach 2:
The patent employs rigid non-wood materials (such as metal alloys or composite materials) that combine the structural integrity and dimensional stability of engineered materials with acoustic properties suitable for musical instruments. This material choice resolves the contradiction by providing resistance to deformation from environmental factors while maintaining the structural requirements for instrument functionality.
2Productivity
If metal casting is used to create a unitary guitar structure, then production time is reduced, but density variations alter the sine wave vibration and affect sound quality
Solution Approach 1:
The patent replaces the traditional metal casting process with CNC machining. Instead of forming the instrument through molten metal solidification (which creates density variations), the CNC process removes material from a solid block, ensuring uniform density throughout the structure. This substitution resolves the contradiction by eliminating density non-uniformities while maintaining the productivity benefits of automated manufacturing.
Solution Approach 2:
The patent changes the manufacturing parameter from casting (which inherently creates density variations) to CNC machining (which maintains uniform density by removing material rather than forming it). This parameter change resolves the contradiction by ensuring consistent material properties throughout the instrument while still achieving efficient production through automated processes.
3Ease of manufacture
If metal frets are inserted individually into transverse grooves by friction-adjustment or glue, then traditional construction methods are followed, but production time increases and skill requirements increase
Solution Approach 1:
The patent merges the frets with the fingerboard by integrating them into a single CNC-machined component. Instead of installing frets as separate pieces requiring friction-adjustment or adhesive bonding, the frets are formed as an integral part of the fingerboard structure. This resolves the contradiction by eliminating the tedious individual installation process while maintaining precise fret positioning through CNC manufacturing capabilities.
4Stability of the object's composition
If the fingerboard-neck combination is fixed with a specific curvature, then structural integrity is maintained, but versatility is reduced as different curvatures cannot be accommodated
Solution Approach 1:
The patent segments the fingerboard from the neck, allowing the fingerboard to be a separate interchangeable component. The neck maintains its structural integrity as part of the integral unitary structure, while the fingerboard can be removed and replaced with different versions having various curvatures. This segmentation resolves the contradiction by preserving the structural stability of the main instrument body while enabling versatility through interchangeable components.
Solution Approach 2:
The patent introduces dynamic configurability to the instrument by enabling interchangeable fingerboards with different curvatures. Rather than fixing the fingerboard-neck combination with a single curvature, the system allows the fingerboard parameter to be changed based on player preference or musical requirements. This dynamic approach resolves the contradiction by maintaining structural integrity of the instrument while adapting to different playing styles and preferences.
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
The solution provides superior sound quality, accurate duplication, reduced production time, and increased versatility with interchangeable fingerboards, ensuring consistent performance and durability by eliminating the need for periodic revisions and maintaining initial adjustments.
Implementation Method 1
manufactured integrally from a solid block of rigid non-wood material, by computer numerical control (CNC)
Implementation Method 2
an interconnected network of cavities for enhanced resonance and sustain
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
Stringed instrument comprising a unitary structure (40) formed integrally by a body (15), a neck (41) and a head (17) from a solid block of non-wood rigid material by computer numerical control (CNC) machining, with the pegs, the bridge, the fingerboard and the strings mounted on said unitary structure (40), front panels (13A, 13B, 13C) and rear panels (21A, 21B) that seal said body (15) and a fingerboard (2, 2') machined by CNC as a single piece and connected to said unitary structure (40) in a removable and interchangeable manner.