Quadrant and CNC machine: what they have in common

1. Step 1. Quadrant — has part — Plumb bob. A plumb line shows the vertical.
2. Step 2. Plumb bob — has part — Rope. A suspension fibre.
3. Step 3. Rope — is part of — Lathe. The bowstring wraps around the workpiece and turns it.
4. Step 4. Lathe — evolved into — Screw-cutting lathe. Maudslay added a lead screw and a slide rest.
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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