The Hand-Crank Grain Winnowing Machine Model STEM Kit is an educational mechanical model that demonstrates the traditional agricultural process used to separate grain from chaff using airflow.

Through hands-on assembly, students build a functional mechanical device that uses manual rotational motion to power an internal fan system. When the crank is turned, the rotating mechanism generates airflow that helps separate lighter materials from heavier grains, replicating the operation of historical grain-cleaning machines used in farming.

This interactive construction project introduces learners to mechanical engineering principles, airflow dynamics, and agricultural technology, while strengthening problem-solving and technical building skills.

The model provides an engaging way to connect science, engineering, and real-world agricultural innovation.

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STEM Learning Concepts

• Mechanical motion and rotation

• Airflow and wind dynamics

• Traditional agricultural engineering

• Mechanical power transfer

• Early farming technologies

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Educational Benefits

• Encourages hands-on STEM learning

• Develops engineering and problem-solving skills

• Introduces historical agricultural technology

• Enhances creativity and logical thinking

• Demonstrates real-world mechanical systems

is an educational mechanical model that demonstrates the traditional agricultural process used to separate grain from chaff using airflow.

Through hands-on assembly, students build a functional mechanical device that uses manual rotational motion to power an internal fan system. When the crank is turned, the rotating mechanism generates airflow that helps separate lighter materials from heavier grains, replicating the operation of historical grain-cleaning machines used in farming.

This interactive construction project introduces learners to mechanical engineering principles, airflow dynamics, and agricultural technology, while strengthening problem-solving and technical building skills.

The model provides an engaging way to connect science, engineering, and real-world agricultural innovation.

⸻

STEM Learning Concepts

• Mechanical motion and rotation

• Airflow and wind dynamics

• Traditional agricultural engineering

• Mechanical power transfer

• Early farming technologies

⸻

Educational Benefits

• Encourages hands-on STEM learning

• Develops engineering and problem-solving skills

• Introduces historical agricultural technology

• Enhances creativity and logical thinking

• Demonstrates real-world mechanical systems

⸻

Product Specifications

Model Type: Mechanical Energy Generator Model

Assembly Type: DIY Wooden STEM Construction Kit

Assembled Model Dimensions:

5.12 × 5.12 × 1.97 inches

(130 × 130 × 50 mm)

Package Size:

11.22 × 8.27 inches

(285 × 210 mm)