Lesson 1: Preparation and Mechanical Sealing (Tape & Canisters)
Duration of Days: 3
Lesson Objective
Students will apply mechanical barriers to the motor and tether to ensure the wax stays contained and the motor shaft remains unobstructed.
Why do we use electrical tape as the "first line of defense"?
How do we protect the motor shaft from being "glued" shut by the wax?
What happens if air is trapped inside the canister during the preparation stage?
Mechanical Seal: A physical barrier (like tape or a canister) used to prevent fluid leakage.
Shaft Clearance: The tiny gap between the spinning motor axle and the canister hole that must remain free of debris.
Strain Relief: A method of securing the cable so that pulling on the wire doesn't break the internal solder joints.
Viscosity: The thickness of a fluid; important for understanding how wax will flow during the next lesson.
ITEEA STEL-7R: Apply a broad range of making and troubleshooting skills.
NGSS HS-PS2-6: Communicate technical information about why molecular-level structure is important in the functioning of materials.
Description: Students prepare the motor by wrapping the terminal end in electrical tape, seating it into the film canister/housing, and ensuring the wire is secured. They must use a small "spacer" or a steady hand to ensure the motor shaft protrudes through the pre-drilled hole without rubbing.
Purpose: To create a "mold" that will hold the liquid/soft wax in place while protecting the moving parts of the motor.
DOK Level: Level 2 (Skill/Concept). Students are following a precise protocol. They must demonstrate "spatial reasoning" to ensure the motor is centered within the canister so that the wax can surround it evenly.
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.
Assessment of Understanding: * The "Spin Test": Before any wax is added, the motor must be powered briefly. If the shaft rubs against the canister or the tape is uneven, the student must re-center the motor.