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Principles of Engineering Unit 1: Mechanisms (VEX)
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Terms in this set (24)
The six simple machines
lever, wheel and axle, pulley, inclined plane, wedge, and screw.
IMA
De/Dr
AMA
Fr/Fe
First class lever (location, direction, and MA)
Fulcrum is located between the effort and the resistance force.
Effort and resistance applied in the same direction.
MA < > or = 1.
Second class lever (location, direction, and MA)
Fulcrum at one end of the lever.
Resistance in the middle.
Resistance force and effort force opposing directions.
MA > 1.
Third class lever (location, direction, and MA)
Fulcrum is at one end of the lever.
Effort in the middle.
Resistance force and effort force are in opposing directions.
MA < 1.
% of efficiency
(AMA/IMA)100
what is the effort is the axle is driving the wheel? (IMA)
axle
what is the resistance if the axle is driving the wheel? (IMA)
wheel
What should be larger: AMA or IMA?
IMA
Fixed pulley
First class lever.
IMA = 1.
Changes direction of force.
Movable Pulley
Second class lever.
IMA=2.
Force directions stay constant.
Pulley IMA
# of strands opposing the force of the load.
What happens if one simple machine is used after another?
the MA's multiply.
Inclined Plane IMA
L(slope/H)
How far will a screw with 13 threads per inch move linearly if turned one full rotation? What would be the pitch?
1/13 of an inch
Screw IMA(what is r?)
2
pi
r/Pitch (r is the length of the wrench the effort is applied by)
MA-total
(MA-1)(MA-2)(MA-3)...
Idler Gear
Allows the driver and driven gears to rotate in the same direction.
Which RPM is slower; smaller gear or larger gear?
larger gear.
Gears locked together...
on a shaft will turn in same direction with the same RPM.
n=?; d=?; w=?; t=?
n = number of teeth
d = diameter
w = angular velocity (speed)
t = torque
GR/1
n-out/n-in = d-out/d-in = w-in/w-out = t-out/t-in
GR-total
GR-1
GR-2
GR-3...
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