Crutch underarm pad and CNC machine: what they have in common

1. Step 1. Crutch underarm pad — is part of — Crutches. A padded crossbar.
2. Step 2. Crutches — evolved into — Wheelchair. Mobility aids.
3. Step 3. Wheelchair — has part — Hub motor. Powered wheelchairs.
4. Step 4. Hub motor — uses — Electromagnetism. A hub motor is an electric motor.
5. Step 5. Electromagnetism — is used in — Servomotor. A servo is an electric motor with feedback.
6. Step 6. Servomotor — is part of — CNC machine. Servo drives move the axes.

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