MOC Mechanical Crank & Rack Reciprocating Mechanism STEM Building Block Set (Parts Kit + Digital Manual)

Explore the principles of mechanical physics and kinematic motion conversion with the MOC Mechanical Crank & Rack Reciprocating Mechanism STEM Building Block Set. Designed as a hands-on mechanical engineering demonstrator, this model combines a hand-cranked drive, slotted oscillating rocker arm, and precision rack-and-pinion gear engagement to convert continuous rotational input into smooth linear reciprocating motion.

Important Notice

• MOC Product: This product is a custom MOC (My Own Creation) building block set composed of high-grade loose technical bricks and mechanical components.
• Packaging: To optimize international shipping efficiency and reduce environmental impact, sets are safely delivered in reinforced protective packaging without original retail color boxes.
• Digital PDF Manual: Paper instructions are not included. Clear, step-by-step electronic PDF assembly manuals will be delivered via email upon package dispatch or customer support request.

Key Features

• Rotary to Reciprocating Conversion: Demonstrates how continuous 360-degree rotational input from a hand crank translates into oscillating pendulum motion and alternating linear rack movement.
• Slotted Lever & Gear-Rack Mechanism: Features a slotted guide link driven by an offset crank pin, meshing an oscillating gear sector with a horizontal toothed gear rack.
• Tactile & Visual Mechanical Learning: Perfect for physics students, educators, young engineers, and mechanical hobbyists looking to understand linkage dynamics and gear-train principles.
• High-Precision Technical Bricks: Precision-molded ABS beams, axles, gears, and pins ensure low friction, consistent tooth engagement, and smooth cycling. 100% compatible with major building block brands.
• Compact Kinetic Desk Display: An engaging mechanical automata desk toy that offers satisfying, interactive tactile operation.

How It Works

1. Rotate the ergonomic red hand crank clockwise or counterclockwise.
2. The offset crank pin glides smoothly within the slotted upright guide arm, oscillating the arm from side to side.
3. The bottom drive gear follows the arm's arc and drives the horizontal red gear rack smoothly back and forth along the base track.

Package Includes

• Complete Model-Specific MOC Technical Bricks, Gears & Linkage Parts Kit
• Digital PDF Step-by-Step Building Instructions (Delivered electronically)

Specifications

• Material: Premium Eco-Friendly ABS Plastic
• Operation: Manual Hand Crank (No batteries or motors required)
• Recommended Age: 8+ / Teens, Students & Engineering Hobbyists
• Compatibility: Fully compatible with major building block systems