Lathe tailstock and bicycle: what they have in common

1. Step 1. Lathe tailstock — is part of — Lathe. It supports a long workpiece.
2. Step 2. Lathe — evolved into — Screw-cutting lathe. Maudslay added a lead screw and a slide rest.
3. Step 3. Screw-cutting lathe — uses — Screw thread. The lathe cuts precise standard threads.
4. Step 4. Screw thread — is used in — Rifling. Helical grooves.
5. Step 5. Rifling — uses — Angular momentum. Spin stabilizes the bullet.
6. Step 6. Angular momentum — is used in — Bicycle. The spinning wheels and the steering geometry help keep balance.

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