Pumped-storage station and CNC machine: what they have in common

1. Step 1. Pumped-storage station — uses — Universal gravitation. Energy is stored as the height of water.
2. Step 2. Universal gravitation — is used in — Pin tumbler lock. The pins drop into holes in the bolt under their own weight.
3. Step 3. Pin tumbler lock — is part of — Lock and key. The pins keep the cylinder from turning without a key.
4. Step 4. Lock and key — evolved into — Smart lock. An electronic lock.
5. Step 5. Smart lock — has part — Servomotor. A bolt actuator.
6. Step 6. Servomotor — is part of — CNC machine. Servo drives move the axes.

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