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Bronto Explains: CNC, Four Ways · 32 seconds

From Metal Block to Bike Bracket: CNC Explained

Follow an illustrative custom bike accessory bracket from a metal block through design, programming, CNC milling and dimensional inspection. A simple way to understand computer numerical control. The bracket and bike are generic illustrations, not a product specification or a demonstrated production process.

Read the CNC referenceMore Bronto Explains: CNC, Four Ways
Bronto Explains: CNC, Four Ways · 32 secondsOriginal MBB film · English captions

About this film

Follow an illustrative custom bike accessory bracket from a metal block through design, programming, CNC milling and dimensional inspection. A simple way to understand computer numerical control. The bracket and bike are generic illustrations, not a product specification or a demonstrated production process.

Limits

No service load, tolerance, material grade or structural suitability is asserted. Not machining or bicycle component design advice.

Animated schematic explainers: not filmed machine demonstrations, machining simulations or operating instructions.

MBB reference pages used in this episode

The Machine Blue Book is an independent machinery research and reference platform. Companies do not pay to be listed or ranked.

Original MBB animated explainer (October 2026): original code-drawn diagrams and layouts, Bronto's synthetic narration (British English; not a clone of a real person's voice) and original music. Narration: Bronto (synthetic voice). English captions are a separate track, so they can be turned off.

Read the complete transcript

See this bike bracket? Imagine making a custom one from a block of metal. A design describes the shape. A machining program tells the machine how to make it. In this example, a CNC mill uses a spinning cutter to remove material. The bracket stays clamped while the cutter follows its programmed path. Then someone checks the dimensions. Looking shiny is not a measurement. That's computer numerical control at work. Discover more at Machine Blue Book.