Knife-edge pivot and CNC machine: what they have in common

1. Step 1. Knife-edge pivot — is part of — Balance scale. A low-friction pivot for the beam.
2. Step 2. Balance scale — includes — Kitchen scale. Scales.
3. Step 3. Kitchen scale — has part — Spring. The load stretches a spring.
4. Step 4. Spring — is part of — Automaton. The mainspring stores the energy.
5. Step 5. Automaton — uses — Program control of a machine. The sequence of movements is “recorded” in cams and cylinders.
6. Step 6. Program control of a machine — is used in — CNC machine. The tool’s movement is set by a program — at first on punched tape.

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