Doodle Drawing Robot J-30 Standard STEM Toy Kit

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The motor is driven by the handle to rotate at a high speed, because the center of gravity of the crank is not at the same point as the shaft of the motor, the center of gravity of the crank will shift when the crank rotates resulting in vibrations. The vibration causes the pen tip to continue to move on the paper, and this is how the doodle drawing robot draws beautiful line patterns on white paper.

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