Form-Following Rotary Bit with Flexible Compressible Member
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Solution Overview
Problem
Existing rotary bits used with rotary tools often cause damage to work objects, particularly when working on curved or shaped surfaces, due to their stiffness and the transfer of vibration, leading to material loss and increased time spent on repairs.
Innovation Solution
A form-following rotary bit with a flexible member made from compressible materials like closed cell foam or silicone, which allows the abrasive material to flex and follow the surface contours, reducing the likelihood of damage during grinding, sanding, and buffing operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a stiff support head is used to transfer rotary motion, then power transmission efficiency is improved, but damage to shaped surfaces occurs due to vibration and rigidity
Solution Approach 1:
The patent replaces the traditional stiff support head with a flexible member made of elastomeric material that can flex and conform to curved surfaces. This flexible member still transmits rotary motion from the mandrel to the abrasive material while accommodating surface irregularities and reducing vibration-induced damage to shaped surfaces.
Solution Approach 2:
The patent changes the physical parameter of rigidity by using an elastomeric material with appropriate durometer hardness. This allows the support structure to be sufficiently rigid to transmit power but flexible enough to conform to curved surfaces and reduce harmful vibrations, resolving the contradiction between power transmission and surface protection.
2Stability of the object's composition
If a rigid rotary bit is used, then structural stability is improved, but manufacturing precision deteriorates due to inability to follow surface contours
Solution Approach 1:
The flexible member acts as a compliant interface that maintains structural stability through its elastomeric properties while allowing the abrasive material to conform to curved surfaces. This enables the rotary bit to follow surface contours accurately, improving manufacturing precision without sacrificing overall structural stability.
Solution Approach 2:
The patent introduces dynamic flexibility to the rotary bit structure, allowing it to adapt its shape in real-time as it contacts curved surfaces. The elastomeric material enables the bit to dynamically conform to surface geometry while maintaining rotational stability, thereby improving surface finish quality.
3Productivity
If high rotary speed is used to increase productivity, then work operation efficiency is improved, but damage risk increases due to vibration and lack of surface following
Solution Approach 1:
The flexible member dampens vibrations generated at high rotary speeds and allows the abrasive material to maintain continuous contact with curved surfaces. This enables high-speed operation to proceed efficiently while reducing the risk of damage that would otherwise occur due to vibration and loss of surface following.
Solution Approach 2:
The elastomeric flexible member acts as a cushioning element that absorbs and dampens vibrations before they can cause damage to the workpiece. This pre-cushioning effect allows the system to operate at high speeds without proportionally increasing damage risk.
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 flexible rotary bit effectively reduces the risk of cutting, gouging, or scoring on shaped surfaces, allowing for efficient and precise work operations while minimizing material loss and repair time, and is compatible with various rotary tools and abrasive materials.
Implementation Method 1
a flexible member having a compressible body
Implementation Method 2
The material for the compressible body is selected so as to allow the distal end of the compressible body to flex
Data Source
AI summary
A rotary bit for use with a rotary tool to improve grinding, sanding, buffing, polishing and like operations on a work object. The rotary bit is structured and arranged to flex when it comes into contact with round, curved and other shaped surfaces of the work object to prevent damage to those surfaces and the areas adjacent thereto. The rotary bit comprises a flexible member that fixedly or detachably mounts to one end of an elongated shaft of a mandrel that fits into and is rotated by the rotary tool. The flexible member has a compressible body with a cap member at the proximal end to provide stiffness and grit paper attached, either fixedly or removably, at the distal end to accomplish the desired work operations. The rotary bit can use different materials for the compressible body and different abrasive materials to accomplish the work operations.