UYKUM Wooden Puzzle 3D Handmade Puzzles for Adults Puzzle Pieces Fit Together Perfectly Kits DIY Crafts Kits for Birthday Gifts

Fully mechanical rotation, super long service life, full of creative mechanical masterpieces. The beauty of machinery and scientific exploration are combined into one, and its historical stories are poured into the precipitation of the years. Retro and elegant shape design, the fusion of wisdom and technology. 1:1 dynamic simulation of full mechanical gear transmission, countless extrapolation of motion schemes, so that all details can be truly restored. Basswood material, 800-grit sandpaper, double-sided grinding, no burrs on the surface. Laser cutting art, precise cutting, accurate grooving, smooth assembly, error control within 5 microns. Complicated assembly steps will not reduce the pleasure of brain-burning, but the operation process is simple and convenient, and the estimated assembly time is 2-6 hours. Double-dial design, interactive potential energy constant pendulum clock, based on Newton’s third law of classical mechanics, the clockwork mechanism and the clockwork hook provide energy, the power output can be completed without batteries, and the accuracy of winding up is 4 hours., Manufacturer: UYKUM