Screw thread and computer: what they have in common

1. Step 1. Screw thread — is used in — Screw-cutting lathe. The lathe cuts precise standard threads.
2. Step 2. Screw-cutting lathe — has part — Lead screw. The lead screw moves the cutting tool.
3. Step 3. Lead screw — is part of — 3D printer. The axes are moved by screws.
4. Step 4. 3D printer — uses — Program control of a machine. The layers are set by a program (G-code), as with CNC.
5. Step 5. Program control of a machine — is used in — Computer. A computer executes a stored program.

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