Machine spindle and steam locomotive: what they have in common

1. Step 1. Machine spindle — is part of — Grinding machine. It turns the wheel.
2. Step 2. Grinding machine — uses — Abrasive. An abrasive wheel.
3. Step 3. Abrasive — uses — Friction. Removing material by friction.
4. Step 4. Friction — is used in — Flanged wheel. The wheel rolls along the rail.
5. Step 5. Flanged wheel — is part of — Steam locomotive. Flanged wheels keep it on the track.

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