michael kontopoulos machines and mechanisms for … · michael kontopoulos machines and mechanisms...
TRANSCRIPT
WHAT WE’LL COVER:
-Simple Machines-Machine Elements (Gears, etc.)-Compound Machines-Linkages-Automata-Artists who make machines
NON-TRADITIONAL MATERIALSTheo Jansen (Organic Motion, Creatures) CLIP
AUTO-DESTRUCTIVE MACHINESJean Tinguely (Abstraction in Machine Thinking)
CLIP
AUTO-DESTRUCTIVE MACHINESM. Kontopoulos “Machines that Almost Fall Over”
CLIP
Torque depends on 3 factors:1. Length of the lever arm2. Force applied3. Angle between lever and axis.
La Mettrie“L’Homme Machine”
One of the earliest to proposethe metaphor of man as machine.
French Physician and Philosopher
Cartesian Dualism, The Enlightenment, Materialism
Arms, Legs, Fingers and Toesare all types of Levers.LINK
“GEARED UP”Larger driver and smaller follower.Increase in speed, but not torque.
“GEARED DOWN”Smaller driver and larger follower.Decrease in speed, but increased torque.
DRIVERFOLLOWER
DRIVER
FOLLOWER
Backlash:A certain amount of play built in.So things move smoothly.
Slop:Too much backlash.
Friction:Insufficient backlash.
(T)MA = # Teeth in Follower / # Teeth in Driver or Follower : Driver
Driver = 8
Follower = 24
TMA = 3/1 = 3
One turn of the DRIVER moves the FOLLOWER 1/3 of the way around (or 120˚)
One turn of the DRIVER moves the FOLLOWER around 3 times.
Reverse Them:
Gear Ratio: Compound Gear Train
D1
TMA = F1/D1 x F2/D2
D2
F1
F2
Ratio = 24/40 x 24/40 = 3/5 x 3/5 = 9/25
Multiply the gear ratios.
CHARLIE CHAPLAN“MODERN TIMES”
GREGORY WITT“MICROSCOPE”
http://www.youtube.com/watch?v=AvNQiF89Pek&feature=related
http://www.andrew.cmu.edu/user/gwitt/microscope/microscope.html
Buying Gears Online: What to look forPressure Angle: The angle at which pressure is handed off to the
next gear in the train. 14.5˚ or 20˚ (usually 20)
Pitch Diameter: The imaginary circle where two gears mesh.
Number of Teeth in the gear.
Pitch: The # of Teeth divided by the Pitch Diameter.
IN ORDER FOR GEARS TO MESH PROPERLY, THEY MUST HAVE THE SAME PRESSURE ANGLE AND PITCH.
These gears will fit together, b/c they have the same pitch (16) anda Pressure Angle of 20.
From the McMaster Carr catalog:
Calculating “Pitch”
Online Gear Template