Handle and CNC machine: what they have in common

1. Step 1. Handle — is part of — Screwdriver. A handle.
2. Step 2. Screwdriver — uses — Screw thread. It drives screws.
3. Step 3. Screw thread — is used in — Screw-cutting lathe. The lathe cuts precise standard threads.
4. Step 4. Screw-cutting lathe — has part — Lead screw. The lead screw moves the cutting tool.
5. Step 5. Lead screw — is part of — CNC machine. Ball screws move the tables.

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