Digital twin and elevator: what they have in common

1. Step 1. Digital twin — uses — CAD. A model from CAD.
2. Step 2. CAD — is used in — CNC machine. Programs from CAD/CAM.
3. Step 3. CNC machine — evolved from — Milling machine. The first CNC machines were milling machines (MIT, 1952).
4. Step 4. Milling machine — has part — Electric motor. The drive.
5. Step 5. Electric motor — is part of — Elevator. An electric motor turns the winch.

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