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this is mechanism 224 an expanding pulley design depicted in the book 507 mechanical movements originally published over 150 years ago many of the mechanisms found in here date back to the first industrial revolution an age of steam engines and rudimentary methods of power transmission and automation many months ago one of my patreon supporters suggested i take a look at the expanding pulley design and try to recreate it in cad and in this video ill show you how i reverse engineered this forgotten mechanism and then used it to create this fully 3d printed lockbox lets get started [Music] i must admit out of all the mechanical movements in this book its one of the more daunting designs to look at and initially i didnt quite understand how it even worked to quote the description two to four represents an expanding pulley on turning pinion d to the right or left a similar motion is imparted to the wheel c which by means of curved slots cut therein thrusts the studs fastened to the ar
