Compact Coarse/Fine Hand Tool for Microradian Rotation
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Solution Overview
Problem
Existing hand-held tools struggle to enable precise, micro-fine rotational adjustments, particularly for mechanical systems requiring rotations within one hundred microradians or less, especially when manual operation is necessary.
Innovation Solution
A hand tool with a reducer mechanism that converts angular rotations of a proximal adjusting element into smaller rotations of a distal tool shaft, allowing for both coarse and fine rotational control through manual or motor-activated means, with a reduction factor of 16, 64, 256, or 1024.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a small hand-held tool is used, then the tool is light in weight and limited in size for comfortable manual control, but it becomes very difficult for a user to effect precise micro-fine rotations of the control element
Solution Approach 1:
A reducer mechanism acts as an intermediary between the user's manual rotation input and the control element. The reducer includes a first gear set with a high gear ratio that amplifies the user's rotational input, enabling precise micro-fine rotations of the control element while keeping the tool lightweight and handheld.
2Measurement precision
If a reducer mechanism is added to achieve micro-fine rotational accuracy, then rotational precision is improved, but device complexity increases
Solution Approach 1:
The reducer mechanism is nested within the handheld tool housing, with the first gear set contained inside the tool body. The adjustment shaft passes through the housing, and the control element is positioned at the distal end, creating a compact nested structure that achieves high rotational precision without excessive external complexity.
3Device complexity
If the adjusting element is made manually rotatable, then the tool remains simple and lightweight, but achieving micro-fine rotational accuracy becomes difficult
Solution Approach 1:
The system changes the mechanical parameter of rotational amplification through the gear ratio of the first gear set. By selecting an appropriate gear ratio, the user's manual rotation input is transformed into precise micro-fine rotations of the control element, achieving high rotational accuracy while maintaining manual operation simplicity.
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
Enables precise micro-fine rotational adjustments of control elements, achieving accuracy within one hundred microradians or less, facilitating comfortable and accurate manipulation even with limited dexterity or in confined spaces.
Implementation Method 1
a reducer coupling the adjustment shaft to the tool shaft within the housing, the reducer being coaxial with the central axis of the housing and rotationally fixed to the housing, rotation of the tool shaft relative to the housing thereby requiring rotation of the adjusting element, and vice versa
Data Source
AI summary
A hand-held tool enables accurate, micro-radian rotation of a control element. The tool includes an adjustment shaft extending distally from an adjusting element, and a reducer within a housing that mechanically couples the adjustment shaft to a distal tool shaft. Rotating the tool as a whole directly rotates the tool shaft, while rotating only the adjustment shaft causes the reducer to apply a smaller rotation to the tool shaft according to a reduction factor that can be between 16 and 1024. The adjusting element can be a manually rotated knob, or a motor, such as a stepper motor, actuated by a switch, such as a momentary contact, rocker, or pushbutton switch. The reducer can include one or more planetary gear stages, and/or one or more strain wave gear stages. The tool can have a length not more than 5 inches and a diameter not more than 0.6 inches.