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| Lecture 4-1 | Gear Teeth Contact | |
| Lecture 4-2 | Involute Curve | |
| Lecture 4-3 | Spur Gear | |
| Lecture 4-4 | Helical Gear | |
| Open Differential | Bevel Gear | |
| Limited Slip Differential | Worm Gear | |
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Herringbone Gear | |
| Lecture 4-5 | Ball Bearing 1 | |
| Ball Bearings | Ball Bearing 2 | |
| Journal Bearings | Ball Bearing 3 | |
| Rolling Bearings | Tapered Roller Bearing | |
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| Homework 4-1 | ||
| Homework 4-2 |
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