Cam and archimedes’ screw: what they have in common

1. Step 1. Cam — is part of — Sewing machine. Cams drive the fabric feed.
2. Step 2. Sewing machine — has part — Crank. A crank turns rotation into the stroke of the needle.
3. Step 3. Crank — is part of — Archimedes’ screw. A handle or rotary drive.

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