mechanical components 2006
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Mechanical Components 1
Overview
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Mechanical Components
This Lecture Will Provide an Overview of
Mechanical Components and ApplicationExamples
Next Lecture Will Go Into More DetailIncluding Analysis and Sizing of CertainComponents
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Testing Machine
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Racing Tricycle
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Racing Tricycle
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Racing Tricycle Completed
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Mechanical Components
Components To Be Covered
Bearings Power Transmission
Belts
Chains Gears
Springs
Power Screws Linkages
Couplings
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Bearings
Allow Relative Rotary or Linear Motion
With Reduced Friction Two Major Types
Plane Antifriction
Others
Air, Magnetic
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Bearings
Plane Bearings
Radial or Thrust orLinear
Bronze, Teflon, Delrin
Lower Cost
Snap-onThrust bearing
Thrust Bearing
Linear Bearing
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Bearings
Antifriction
Radial or Thrust or
Linear Usually Steel
Ball, Roller, Needle
More Expensive
Ball Bearing
Roller Bearing Roller Bearing Dimensions
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Needle Bearings
Examples of Bearings
Air Bearings
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Bearings
Design Issues
Cost Friction
Mounting Sizing
Load
RPM Life
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Bearing Mounting Examples
Bearing MountedPerpendicular to Shaft Rotation
Bearing Mounted Parallelto Shaft Rotation
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Power Transmission
Transmission of Rotary Motion Between
Two or More Shafts Belts
Chain
Gears
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Belts
V-Belts
Relatively Inexpensive Round Belts
Can Make Custom Belt Lengths
Can Make Pulleys
Relatively Inexpensive
Gearbelt or Timing Belts Positive Drive
More Expensive
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Belt ExamplesV-Belts: Timing Belts:
Round Belts:
Solid Vs. Hollow Round Belt Adjustable Length Round Belt
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Chain
Positive Drive
Inexpensive-Bicycle Components More Expensive-Industrial
Components
Single Strand Chains Vs. Double Strand Chains
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Gear Examples
Worm Gears Bevel Gears
Spur Gears Helical Gears
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Gears
Materials
Brass, Steel, Cast Iron, Plastic Wide Range Of Cost
RC Gears: Relatively Inexpensive Industrial Gears: More Expensive
Sensitive To Mounting Distance
Most Hold Center to Center DistanceTolerances
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Springs
Three Major Types
Compression Extension
Constant Force
Many Others
Leaf
Torsional
Others
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Spring Examples Cont.
Torsion Springs:
Constant Force Springs:
Torsion Spring Dimensions
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Springs
Spring Constant
F = KX Example
Compression Springs In Parallel F = (K1 + K2)X
Compression Springs in Series
F = ((K1K2)/(K1+K2))X
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Power Screws
Used For Raising Weights or Exerting
Forces in Machines Square
Acme
Buttress
Ball
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Power Screw ExamplesAcme Power Screw: Ball Power Screws:
Ball Screws
Ball Screw Mounts
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Linkages
Mechanical
Advantage Motion Generation
Mechanical Logic
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Couplings
Join Two Shafts Together
Connection Allow For Misalignment
Allow For Rotation
Absorb Shock
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