Lathe headstock and computer: what they have in common

1. Step 1. Lathe headstock — is part of — Lathe. It rotates the workpiece.
2. Step 2. Lathe — evolved into — Screw-cutting lathe. Maudslay added a lead screw and a slide rest.
3. Step 3. Screw-cutting lathe — has part — Lead screw. The lead screw moves the cutting tool.
4. Step 4. Lead screw — is part of — 3D printer. The axes are moved by screws.
5. Step 5. 3D printer — uses — Program control of a machine. The layers are set by a program (G-code), as with CNC.
6. Step 6. Program control of a machine — is used in — Computer. A computer executes a stored program.

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