Gear Train Mechanism

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  ENGINEERING MECHANICS(LAB) Gear Train Mechanism Instructor: Muhammad MahadShah  Gears ◦ A typical DC motor operates at speeds that are far too high to be useful, and at torques that are far too low. Gear  reduction is the standard method by which a motor is made useful. ◦ Gears are classified by the number of teeth they have; the description of which is then shortened to form their name. For instance, a gear with 24 teeth becomes a 24t gear.   Fundamental Properties ◦ The gears are transferring motion from one axle to the other. ◦ If their teeth match well, there is only a small amount of friction. ◦ The two axles turn in opposite directions: one clockwise and the other counterclockwise. ◦ The two axles revolve at different speeds. When you turn the 8t, the 24t turns more slowly, while turning the 24t makes the 8t turn faster.  Gearing Up and Down ◦ Gearing is able to convert torque to velocity. The more velocity gained, the more torque sacrifice. The ratio is exactly the same: if you get three times your srcinal angular velocity, you reduce the resulting torque to one third. ◦ This conversion is symmetric: we can also convert velocity to torque at the same ratio. ◦ The price of the conversion is power loss due to friction.
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