This is why I have 17,342 pounds of tools

Summary by Krater

The creator designs, fabricates, and tests nine different catapults in his shop, each made with a different machine, and evaluates their performance by firing steel ball bearings at a glass pane.

From the video

Answers: How do you build and test nine different catapults using every machine in a workshop?

• catapult design and fabrication
• workshop machining techniques
• CNC milling and routing
• laser cutting and 3D printing
• sheet metal bending and welding
• motion tracking and speed analysis

What it concludes

• The 3D printed catapult with 18 plastic springs scored 4 out of 10.
• The floating-arm trebuchet made with the CNC router scored 4 out of 10.
• The centrifugal catapult fired 1/2-inch steel ball bearings full auto but scored 4 out of 10.
• The roller-driven leaf-spring catapult scored 5 out of 10.
• The wrist-mounted laser-cut catapult scored 5 out of 10.