Drill Easy Hole Start Control for Torque and Grip Stability
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Solution Overview
Problem
Drilling power tools with high torque motors can cause users to lose control during operation, leading to safety and operational challenges.
Innovation Solution
Implementing an easy hole start mechanism in drilling power tools, which includes a controller that detects actuator activation, gradually increases motor speed from a low speed to a target speed, and shuts off the tool if the target speed is not reached within a predetermined time, ensuring controlled operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a motor outputs high torque to the tool upon actuation of the trigger, then the drilling power tool can perform drilling operations effectively, but the user may lose control of the drilling power tool
Solution Approach 1:
The system performs preliminary action by initially driving the motor at a reduced first speed before increasing to the target second speed. This staged approach allows the user to first establish control and grip, then gradually receive full power, preventing sudden torque that would cause loss of control while still achieving effective drilling operation.
Solution Approach 2:
The system applies dynamics by dynamically adjusting the motor speed from a first speed to a second speed based on operational conditions. The controller monitors whether the drill bit has successfully engaged the workpiece and adjusts power delivery accordingly, transitioning from a controlled low-power state to a high-power state when needed.
2Productivity
If the motor speed is increased from a first speed to a second speed, then the drilling power tool can achieve target drilling performance, but the user may lose control if the speed increase is too rapid
Solution Approach 1:
The system establishes a preliminary low-speed phase where the motor operates at a first speed, allowing the user to secure their grip and prepare for the upcoming speed increase. This preliminary action ensures user readiness before full power is delivered, maintaining control while enabling high productivity.
Solution Approach 2:
The system uses periodic action by implementing a time-based speed increase protocol where the motor transitions from first speed to second speed over a predetermined time interval. This controlled temporal progression ensures the speed increase is neither too sudden nor too prolonged, balancing productivity with user control.
3Ease of operation
If the motor is driven at a reduced first speed initially, then the user can maintain control, but the drilling operation takes longer to reach target speed
Solution Approach 1:
The system minimizes time loss by implementing a periodic action with a predetermined time interval for the speed transition. The controller is configured to increase the motor speed from the first speed to the second speed within this specific time frame, ensuring the low-speed control phase is neither too long nor too short, optimizing both control and efficiency.
Solution Approach 2:
The system applies dynamics by making the speed transition adaptive and time-dependent. Rather than maintaining a fixed low speed indefinitely, the controller dynamically adjusts the motor speed based on the elapsed time and operational conditions, allowing a swift transition to target speed once the user has established control, thereby minimizing time loss.
4Reliability
If the power tool shuts off when the target speed is not reached within a predetermined time, then safety is improved, but the drilling operation may be interrupted
Solution Approach 1:
The system applies beforehand cushioning by implementing a predetermined time threshold that acts as a safety buffer. If the motor fails to reach the target second speed within this threshold, the controller shuts off power to prevent unsafe conditions. This prior cushioning mechanism protects the user while allowing sufficient time for normal variations in drilling conditions.
Solution Approach 2:
The system uses feedback by continuously monitoring whether the motor has reached the target speed within the predetermined time interval and responding accordingly. This feedback loop ensures safety by shutting off power when conditions indicate a problem (failure to reach target speed), while also enabling continuous operation when conditions are normal, thus balancing safety with productivity.
Data Source
AI summary
A power tool, such as a drilling power tool, configured to perform an easy hole start operation upon actuation of a trigger. When the trigger is actuated, the motor is driven at a low speed value. The motor speed is increased to a second speed value during a predetermined time threshold and then driven at the second speed value until the trigger is no longer actuated. In some embodiments, the easy hole start operation may be implemented by an easy hole start switch. In some embodiments, if the easy hole start operation persists for a time greater than a predetermined time threshold, then the motor will shut off.