Case 6: Wood-Sawing Robot
Case Introduction
Build a wood-sawing robot, and make the robot simulate wood-sawing action by controlling the reciprocating rotation of the servo.
Teaching Preparation
| Name | Illustration |
|---|---|
| Nezha Pro AI Mechanical Power Kit |  |
Teaching Objectives
- Complete the assembly of the wood-sawing robot, master the assembly method of the servo and the "saw blade" component, correctly connect the servo and program to control its reciprocating rotation, and realize the simulated wood-sawing action.
- Understand the "angle-controllable" feature of the servo, recognize the connection between reciprocating rotation and wood-sawing action, and learn to set the rotation angle and frequency of the servo through programming.
- Stimulate interest in industrial machinery, perceive the role of servos in precise control, and establish the cognition that "technology simulates industrial production".
Story Introduction
After repairing Xuan Yi (the helicopter), the image it sent back showed that the gear beasts were gnawing at the village's guardrail with their sharp teeth. "We must reinforce the fence quickly!" The carpenter robot pushed a pile of logs over. "But my wood-sawing robot 'Juchi' (Sawtooth) isn't working—it can't saw the logs into planks." The children found that the motor wire connection next to the saw blade was loose. Aji pressed the start button, and the motor only made a "buzzing" idle sound: "Its principle is simple, just like the electric saw at home—the motor directly drives the saw blade to rotate; once the motor runs, it can drive the saw blade to work."
Learning Exploration
- What impact does the reciprocating rotation angle of the servo (e.g., 0°-90°, 0°-180°) have on the "wood-sawing effect" of the wood-sawing robot? What problems will occur if the angle is too large or too small?
- Will adjusting the rotation frequency of the servo (e.g., 1 reciprocation per second, 2 reciprocations per second) change the "efficiency" of the wood-sawing action?
- Compare the actions of a real electric saw (e.g., handheld electric saw) and the wood-sawing robot—does the saw blade of a real electric saw rotate continuously or reciprocate? What are the differences in their application scenarios?