Barrel staves and CNC machine: what they have in common

1. Step 1. Barrel staves — is part of — Barrel. Curved oak planks.
2. Step 2. Barrel — is made of — Iron. The staves are bound with iron hoops.
3. Step 3. Iron — is material for — Lead screw. The lead screw is iron.
4. Step 4. Lead screw — is part of — CNC machine. Ball screws move the tables.

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