Mechanical Mechanisms
Gears
Spur Gear
Different sizes
Bevel Gear
Rotates through 90 degrees
Rack and Pinion
Rotary motion to linear motion
Chain and Sprocket
transmits rotary motion from one gear wheel to another
Rachet and Pawl
only rotates in one direction, useful for lifting heavy weights
Compound Gear Train
Gear sizes determine speed
Idler Gear
changes direction of rotation, used to fill in gaps between driver and driven gears
Worm and Worm Wheel
high torque, the worm always drives the worm wheel
Pulleys
Stepped Pulley
useful for changing speeds
Reverse Pulley
changes direction by crossing the belt
Regular Pulley System
pulleys rotate in the same direction
Idler Pulley
helps guide the belt and create tension
Linkage
Parallel Linkage
Transfers motion from one point to another
Motors
Inline
cheap
Ideal for wheels
rotates 360 degrees
ratio~120:1
Servo
high torque
rotates 180 degrees
Gearbox
set speed
compact
high efficiency
expensive
Stepper
used in CNC
excellent response to starting, stopping, and reversing
high torque
3v Motor
small
ideal for fan
good speed regulation
Speakers
Buzzer
one sound
Piezo
good for individual notes
Micro speaker
used in phones, tablets, plays tunes
Cams and Followers
many shapes
converts rotational motion into linear motion
straight line movement
follower shape determines accuracy
shape determines movement of follower
