This post ends with Huai Ruogu Yu 2020-5-6 09:50 edit
The appearance of water mills in the Han Dynasty is a testament to the wisdom of ancient Chinese laboring people. It uses principles such as leverage and cam to create a water mill model with children, allowing them to get to know it and reminisce about their childhood......
Drawings see attachment
Explanation: Many of the boards in the assembly picture below have some circular holes and other openings, as I need to add electronic components to achieve intelligent demonstration function in the future. This article only introduces the installation of static models, and the provided drawings have also been modified. Cutting according to this drawing will not have any circular holes, etc. Pictures may not be displayed when viewing on the mobile phone, but can be viewed on my official account.
01 Install water turbine
  02 Assemble the box body     03 Install the support  04 Paste the pestle pole and crossbeam  05 Install the pivot shaft   06 Install the mortar   
For more works, please pay attention to my official account: Da Kai Zhi Chuang
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