7. Mechanical devices (motions, levers, linkages) Flashcards
What are the four types of motion?
- linear motion
- oscillating motion
- rotary motion
- reciprocating motion
What is linear motion?
The movement in one direction across a straight line
What is oscillating motion?
The constant movement from side to side along a curved path
What is rotary motion?
movement in a circle
What is reciprocating motion?
the repetitive up-and-down or back-and-forth linear motion
What are the 3 types of levers?
- class one
- class two
- class three
What is a class one lever?
A class one lever has its input on one side of the fulcrum and it’s output on the other
What is a class 2 lever?
A class two lever has its input at one end of the lever, its output in the middle and fulcrum at the other end
What is a class 3 lever?
A class three lever has its output at one end of the lever, its fulcrum at the other with its input in the middle
What is the equation for working out the levers distance of travel (output distance)?
output / input x input distance = output distance
What is the equation for mechanical advantage (MA)?
MA = load / effort
What is a reverse motion linkage?
A linkage that changes the direction of the input motion so that the output travels in the opposite direction If the input is pulled than the output is pushed and vice versa.
What is parallel motion or push/pull linkage?
It maintains the direction of the input motion so that the output travels in the same direction.
What is bell crank linkage?
It changes the direction of the input motion through 90 degrees. It can be used to change horizontal motion into vertical motion or vice versa
What is a crank and slider linkage?
It changes rotary motion into reciprocating motion or vice versa
