Universal joint and needle: what they have in common

1. Step 1. Universal joint — has part — Shaft. Connects two shafts.
2. Step 2. Shaft — uses — Torque. A shaft transmits torque.
3. Step 3. Torque — is used in — Crankshaft. It turns the stroke of the pistons into torque.
4. Step 4. Crankshaft — is a kind of — Crank. A crankshaft is several cranks on one shaft.
5. Step 5. Crank — is part of — Sewing machine. A crank turns rotation into the stroke of the needle.
6. Step 6. Sewing machine — has part — Needle. A needle with the eye near its point.

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