Power Tool Automatic Feathering Mode Control
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Solution Overview
Problem
Manual feathering of power tools, such as drills and impact drivers, leads to user fatigue and potential damage to the input switch due to the need for continuous manual pulsing of the switch during fastening operations.
Innovation Solution
A power tool system that automatically controls motor power delivery based on the position of the input switch, switching between continuous and discontinuous power modes to simulate feathering, reducing user fatigue and extending switch lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual feathering of the input switch is used to drive the fastener in small increments, then the fastening precision is improved, but the user fatigue increases and the input switch may be damaged
Solution Approach 1:
The system performs automatic feathering by detecting fastener resistance and automatically adjusting motor power delivery, eliminating the need for manual switch pulsing. The control system serves itself by monitoring operational parameters and making autonomous adjustments to maintain precise fastening control.
Solution Approach 2:
The manual mechanical switching operation is replaced with an electronic control system that uses sensors and microcontrollers to detect fastener resistance and automatically adjust motor power, substituting the mechanical feathering action with an electronic control mechanism.
2Manufacturing precision
If manual feathering of the input switch is used to drive the fastener in small increments, then the fastening precision is improved, but the reliability of the input switch deteriorates due to continuous pulsing
Solution Approach 1:
The control system performs automatic feathering by detecting fastener resistance and automatically adjusting motor power delivery, eliminating the need for manual switch pulsing. The control system serves itself by monitoring operational parameters and making autonomous adjustments to maintain precise fastening control.
Solution Approach 2:
The manual mechanical switching operation is replaced with an electronic control system that uses sensors and microcontrollers to detect fastener resistance and automatically adjust motor power, substituting the mechanical feathering action with an electronic control mechanism.
3Productivity
If continuous power is delivered to the motor, then the productivity is improved, but the ability to avoid stripping the fastener deteriorates
Solution Approach 1:
The system dynamically adjusts motor power delivery based on real-time detection of fastener resistance. The control system transitions between continuous power mode for rapid advancement and discontinuous feathering mode when resistance thresholds are exceeded, optimizing both speed and precision throughout the fastening process.
Solution Approach 2:
The system employs periodic monitoring of fastener resistance and applies discontinuous power pulses (feathering) when resistance thresholds are exceeded. This periodic detection and response mechanism allows the system to maintain fastening precision while minimizing interruptions to the overall fastening process.
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 automatic feathering mode reduces user fatigue and minimizes damage to the input switch by allowing controlled, incremental power delivery, enhancing tool reliability and extending its lifespan.
Implementation Method 1
A power tool, such as a drill, drill/driver, hammer drill, screwdriver, or impact driver, may be used for driving a fastener such as a threaded screw or nut into a workpiece
Data Source
AI summary
A power tool includes a housing, a motor disposed in the housing, an output spindle configured to be driven by the motor, an input switch, and a controller configured to control power being delivered to the motor. The controller is operable in one of: (a) a normal mode where the controller causes continuous electric power to be delivered to the motor during actuation of the input switch in a first range of positions; and (b) a feathering mode where the controller causes discontinuous electric power to be delivered to the motor during actuation of the input switch in a second range of positions that is different from the first range of positions motor to simulate feathering the input switch.