simple machines gears velocity ratios and mechanical advantage
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Simple Machines: Gears, Velocity Ratios and Mechanical Advantage

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Simple Machines: Gears, Velocity Ratios and Mechanical Advantage. What is a simple machine?. A device which uses basic mechanisms to make work easier for the user. Example: Lifting a heavy box with a rope and pulley system

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what is a simple machine
What is a simple machine?
  • A device which uses basic mechanisms to make work easier for the user.
    • Example: Lifting a heavy box with a rope and pulley system
  • Simple machines are found in many transportation devices such as the following:
    • Cars
    • Bicycles
    • Trains
what are gears and why are they so useful
What are gears and why are they so useful?
  • Gears are toothed wheels which interlock to form simple machines.
    • The tighter the joint, the less chance of slipping
    • Gears range in size but the important number is how many teeth a gear has.
what is a gear ratio
What is a gear ratio?
  • A gear ratio is the ratio between the driver gear (the one being powered) and the driven gear (the one connected to the driver)
    • Gear Ratios are expressed as fractions and can be written a number of ways.
      • 1 to 3
      • 1/3
      • 1:3
    • Always remember that the driven gear will turn in the opposite direction of the driver gear
what is a pulley
What is a pulley?
  • A wheel with a grove carved around its circumference in which a rope or belt is placed to drive the wheel.
    • Pulleys are used in a number of applications including:
      • Elevators
      • Cranes
      • Automobiles
drawbacks of pulleys
Drawbacks of Pulleys
  • Pulleys work great as long as the belt which connects them is tight and both pulleys are aligned.
    • Pulleys tend to slip when too much strain is placed on the system.
how do i calculate my gear ratio
How do I calculate my gear ratio?
  • A simple equation is used to find the ratio of your gearing system
    • Number of Teeth on the Driven Gear / Number of Teeth on the Driver Gear.
    • Size of the driver pulley/ Size of the driven pulley
what is velocity ratio vr
What is Velocity Ratio (VR)?
  • When calculating for velocity or speed, it is best to have a ratio in which the driver gear is larger than the driven gear.
    • For maximum speed you should always have a larger driver gear/pulley paired with a smaller driven gear/pulley.
what is mechanical advantage ma
What is Mechanical Advantage (MA)?
  • Reciprocal of velocity ratio.
    • Mechanical advantage describes how much work can be done based on the input.
    • If my system required me to apply 50 pounds of force into the system to lift 100 pounds of weight, I have used MA.
so which do i want
So which do I want?
  • Higher velocity ratios are better when working on straight and level surfaces which are smooth.
    • Always remember that with a high VR your system will have very low power.
  • Higher mechanical advantage systems are better with inclines surfaces that are bumpy.
    • With a high MA your system will produce more power, but will move slower.
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