The Unofficial LEGO Technic Builder's Guide by Pawet "Sariel" Kmiec (Second Edition) tells you how to build machines, models, robots, etc. that will work.
You need to construct these things in a way that ensures they won't easily fall apart, and that requires a certain amount of engineering. There are some fairly expensive and specialized Lego Technic pieces that you may not have on hand, and this book can help you emulate them. How do you matcha motor or servo to a specific task? You need to know some stuff to make that decision sensibly. How do you make a transmission? Or an…
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