Why can rollers create patterns on metal surfaces? #Science #Unzip #Metalworking #Knurling

When the post-00s become teachers, this is how they write exam papers!

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This is how brushes are made

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[DIY] Polished Some Solid Bamboo For Fans

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【BESIEGE Challenge of Possibilities】Unicorn Gundam

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[Handicraft] The Reborn of A Decades-year-old German Pencil Sharpener

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A living carrot managed to escape from a laboratory

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Made a glider with balsa wood strips and film, and the weight is only 0.42 grams? !

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Isn't this a perpetual motion machine?

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Heavy-metal music of LinKinPARK's "Given up" was covered by a boy

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DIY angle grinder sliding cutting aids, safe, precise and beautiful.

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[MAD] JoJo | Gring Me Down

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Remember it? The uncrowned king of the robot competition, invincible to the audience!

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Man's Speed Bump - Skilled Worker Series

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The big challenge of hand-rubbing various types of engines: single-cylinder fuel engine!

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【Mobile Police】⚡Who can refuse such a mecha? ⚡

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[MV Teaser] The VERSUS - "Lost Soul"

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Technology has changed life

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[SolidWorks] Create 3D Panzer III With This Software

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Anime|So Many Cars, Let's Build An Amusement Park

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