Mechanicla Devices Flashcards
Wha tisnlinear move.ent
Movement in a straight line
What is reciprocating movement
Movement back and forth
What is rotary movement
Movement on or around an axis
What is oscillating movment
Back and forth movement on a curve
What is the purpose of a lever
Gain mechanical advantage
What is the fulcrum
Point around which a lever turns - pivot
What is effort
The input force
What is load
The output.force.from a lever
How do you.calculate.the mechanical advsntage
MA = load/effort
What is a first order lever
Has the fulcrum between load and effort - see saw
What is Second order lever
Wheelbarrow effort at one end fulcrum at other load somewhere I the middle
What is a third order lever
Bbq tongs load is at one end fulcrum.at the other amd effort applied in middle
What is a push pull linkage
Maintains direction
What is a bell crank linkage
Changes direction of motion through 90 degrees
What is a cam used for?
To turn rotary motion into reciprocating motion
How does a cam work?
As the cam rotates it pushes up a follower
Give examples.of.different types of cams
If I wanted to make a crank easier to turn what would I do
Move the handle.further away from the pivot
Wear ate gears
A rotational linkage made up.of toothed wheels
What is the drive gear
The input gear
What is the driven gear
The output gear
What is the purpose of an idelr gear
Is used to change the direction so that the drive gear and and driven gear rotate the same way
What is the gear ratio
Drive ration = teeth on driven gear/teeth on drive gear
How do you calculate the velocity ratio
Velocity ratio = drive gear / driven gear
