Lesson 5: Analysis of Clawbot

How do the different subsystems of the Clawbot work together to complete a task?

In what ways does the physical build of the claw limit or enhance its ability to manipulate objects?

If we changed the gear ratio on the arm, how would it affect the speed versus the lifting power (torque)?

Drivetrain: The system of components that transmits power from the motor to the wheels.

Gear Ratio: The relationship between the number of teeth on two gears that are meshed or connected by a chain.

Torque: A twisting force that tends to cause rotation; essential for lifting heavy objects.

Center of Gravity: The point at which the weight of the robot is evenly dispersed and all sides are in balance.

Degrees of Freedom: The number of independent ways a mechanical system can move.

ISTE 1.4.d: Students exhibit a tolerance for ambiguity, perseverance, and the capacity to work with open-ended problems.

NGS-ETS1-3: Analyze data from tests to determine similarities and differences among several design solutions to identify the best characteristics of each.

CSTA 3A-AP-13: Create artifacts by using procedures within a program to decompose a problem.

Description: Anatomy & Motion. Students perform a "teardown analysis" (visual or physical) of the Clawbot. They map out the V5 Brain, motors, and sensors, documenting how the 2-motor drivetrain differs from the 1-motor lifting arm in terms of power. Performance Review. Students run the Clawbot through a standard challenge (e.g., moving cubes to a platform). They collect data on success rates, tipping points, and speed, then brainstorm three specific mechanical modifications to improve the design.
Purpose
The purpose of this lesson is to move students from "operators" to "engineers." By analyzing a stock build like the Clawbot, students learn to identify inherent design flaws—such as a high center of gravity or limited claw reach—before they begin building custom robots for competition.
DOK (Depth of Knowledge) Level
Level 3: Strategic Thinking
Students are not just identifying parts; they are analyzing the why behind the design and justifying potential improvements based on mechanical principles.

In this course, we recognize that students enter the lab with varying levels of technical experience. Our differentiation strategy employs a 'Scaffolded Autonomy' approach. We provide structured, step-by-step guidance for foundational concepts while offering open-ended, 'Design Challenge' extensions for advanced learners. By utilizing peer-mentorship models, diverse instructional media (visual, tactile, and digital), and flexible project pathways, we ensure every student can move from consumer to creator at their own pace.

• Formative: A "Subsystem Map" where students must correctly label the mechanical advantage (gearing) used for the arm vs. the wheels.

• Summative: A "Design Pitch" (written or oral) where students propose one specific modification to the Clawbot (e.g., adding a 4-bar linkage or changing wheel types) and explain how it would improve performance using at least two terms from the terminology list.