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Automated machine sets new record for solving Rubik’s Cube
Published:  30 May, 2024

Mitsubishi Electric says it has set a new record for the fastest robotic machine to solve a Rubik’s Cube puzzle. Its custom-built machine took just 0.305 seconds to complete the puzzle – beating the previous record of 0.38s, which Mitsubishi itself set in 2021. The new record has been ratified by the Guinness World Records organisation.

The puzzle-solving machine – called the Tokui Fast Accurate Synchronised motion Testing Robot (TokuFastbot) – is based on factory automation technologies including a AI-powered colour-recognition algorithm, and servomotors that can rotate through 90 degrees in 0.009s. Other elements of the machine include a PLC, an industrial PC, a touch panel display and machine vision cameras and lighting, all designed to achieve high-speed signal connections and inter-device controls.

A program analyses the block-rotation process to achieve matching colours on each face of the cube in the shortest number of moves.

An algorithm identifies the colours of the individual blocks using proprietary AI to ensure accuracy, even when the appearance of the blocks vary because of changing positions or shadows cast by the robotic grippers. The algorithm can recognise and identify red and orange blocks reliably. These colours can be difficult to distinguish because of their similar hues.

Mitsubishi’s puzzle-solving machine uses six high-speed servomotors to rotate the sides of the Rubik’s Cube through 90 degrees in 0.009s

The six high-speed servomotors that rotate one side of the cube at a time were manufactured using a technology that positions the motor windings quickly and accurately.

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