basic dimensioning and tolerancing - mercer...
TRANSCRIPT
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Basic Dimensioning and Tolerancing
Dr. Hodge Jenkins
MAE 205
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Important Elements of Dimensioning
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Dimension locationsDimensions and all text are ALWAYS horizontal
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Size and Location of Features
Dimension features in the view best seen.
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Dimension Examples
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Dimension Line Spacing
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Dimension Locations
NO
NO
YES
Dimension out part
boundary
YES
Dimensions and all text are ALWAYS
horizontal
NO
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Grouping of Dimensions
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Grouped dimension
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Diameter Features
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Diameter Features
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DimensioningSlots
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Dimensioning Consideration
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Tolerancing
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Thread Standards and Definitions• Pitch – distance between
adjacent threads. Reciprocal of threads per inch
• Major diameter – largest diameter of thread
• Minor diameter – smallest diameter of thread
• Pitch diameter – theoretical diameter between major and minor diameters, where tooth and gap are same width
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Standardization• The American National (Unified) thread standard
defines basic thread geometry for uniformity and interchangeability
• American National (Unified) thread
• UN normal thread
• UNR greater root radius for fatigue applications
• Metric thread
• M series (normal thread)
• MJ series (greater root radius)
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Thread Standardization• Coarse series UNC
• General assembly
• Frequent disassembly
• Not good for vibrations
• The “normal” thread to specify
• Fine series UNF• Good for vibrations
• Good for adjustments
• Automotive and aircraft
• Extra Fine series UNEF• Good for shock and large vibrations
• High grade alloy
• Instrumentation
• Aircraft
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Thread Standardization
• Basic profile for metric M and MJ threads shown
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Bolt Specification
Nominal diameter
¼-20 x ¾ in UNC-2 Grade 5 Hex Head
bolt
Threads per
inch
length
Thread series
Class fit
Material
grade
Head type
M12 x 1.75 ISO 4.8 Hex head bolt
Metric
Nominal diameter
Pitch
Material class
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Diameters and Areas for Metric Threads
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Diameters and Areas for Unified Screw Threads
Table 8–2
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Head Type of Bolts• Hexagon head bolt
– Usually uses nut
– Heavy duty
• Socket head cap screw
– Usually more precision applications
– Access from the top
• Machine screws
– Usually smaller sizes
– Slotted or Philips head common
– Threaded all the way
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Machine Screws : Types of Heads
Shigley’s Mechanical Engineering Design
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Threads and threaded fasteners
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