Dental drill and elevator: what they have in common

1. Step 1. Dental drill — works like — Electric drill. The same task — spinning a drill bit; the foot-powered dental drill appeared before the electric drill.
2. Step 2. Electric drill — works like — Drill press. A drill press and a hand drill do the same — spin a bit — but the press is fixed to a bench.
3. Step 3. Drill press — has part — Belt drive. A belt turns the spindle.
4. Step 4. Belt drive — has part — Pulley. The belt wraps around pulleys.
5. Step 5. Pulley — is part of — Elevator. The rope runs over a pulley.

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