Wrought iron and CNC machine: what they have in common

1. Step 1. Wrought iron — is material for — Wrench. Wrenches are wrought iron.
2. Step 2. Wrench — uses — Bolt and nut. A wrench turns nuts.
3. Step 3. Bolt and nut — has part — Screw thread. A bolt and a nut are joined by a thread.
4. Step 4. Screw thread — is used in — Screw-cutting lathe. The lathe cuts precise standard threads.
5. Step 5. Screw-cutting lathe — has part — Lead screw. The lead screw moves the cutting tool.
6. Step 6. Lead screw — is part of — CNC machine. Ball screws move the tables.

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