Inkjet print head and lathe: what they have in common

1. Step 1. Inkjet print head — is part of — Inkjet printer. Nozzles eject droplets of ink.
2. Step 2. Inkjet printer — has part — Servomotor. Stepper motors for the carriage and feed.
3. Step 3. Servomotor — is part of — 3D printer. Stepper motors.
4. Step 4. 3D printer — has part — Lead screw. The axes are moved by screws.
5. Step 5. Lead screw — is part of — Screw-cutting lathe. The lead screw moves the cutting tool.
6. Step 6. Screw-cutting lathe — evolved from — Lathe. Maudslay added a lead screw and a slide rest.

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