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
