tolerance partone latest
TRANSCRIPT
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Tolerancing
Part 1
Interpreting, Specifying,Manufacturing & Measuring
Various Dimensional Tolerances
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Specification For
Paper Sizes
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Paper Sizes
Series of Sizes:
• Based on Width : Length = 1 :
•Each next smaller size has an area = Half that of previous bigger size
•Next smaller size produced by halving the longer dim(retaining the shorter dim as the new length)
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Paper Sizes
A0 = 841 X 1189 = 1.0000 m2
A1 = 594 X 841 = 0.5000 m2
A2 = 420 X 594 = 0.2500 m2
A3 = 297 X 420 = 0.1250 m2
A4 = 210 X 297 = 0.0625 m2
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Tolerancing
Tolerance = Permissible Variation
To be specified only when & where essential for functionality
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Tolerancing
Cost of
Mfg
Tolerance
Costly Zone Optimum Zone
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Tolerancing
Tolerance
Dimensional
• Dia
• Length
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Tolerancing
Tolerance
Dimensional Form
• Circular
• Straightness
• Cylindricity
Variation of actual condition of form feature(Surface/line) from geometrically ideal position
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Tolerancing
Tolerance
Dimensional Form Positional
B
A
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Tolerancing
Tolerance
Dimensional Form Positional Surface Finish
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Tolerancing
Tolerance
Dimensional Form Positional Surface Finish
Tolerance of Size automatically limits the tolerance of form & position!
The indication of tolerance of form & position does not necessarily imply the use of any particular method of mfg..
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Tolerancing
Tolerance
Dimensional Form Positional Surface Finish
Waviness
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Tolerancing
General Tolerances = ?
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Tolerancing
General Tolerances =
Tolerances for
Linear & Angular dimensions
without individual Tolerance Indications
Ref IS 2102(Part 1) : 1993
ISO 2768-1 : 1989
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Tolerance on dims. Unless otherwise specified
CategoryClass
0.5 to 3mm
3 to 6 mm 6 to 30mm30 to
120mm
Fine ?
Medium
Coarse
ExtraCoarse
Tolerancing
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Tolerancing
Examples for
• Fine
• Medium
• Coarse
• Extra Coarse Components ?
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Tolerancing
“One thing at a time & that too done well is the way to happiness” AKB
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Tolerancing
Examples for
• Fine : Rollers for Needle bearings
• Medium :
• Coarse :
• Extra Coarse :
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Tolerancing
Examples for
• Fine : Rollers for Needle bearings
• Medium : Swiss Auto -Turned Parts
• Coarse :
• Extra Coarse :
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Tolerancing
Examples for
• Fine : Rollers for Needle bearings
• Medium : Swiss Auto -Turned Parts
• Coarse : Rivet
• Extra Coarse :
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Tolerancing
Examples for
• Fine : Rollers for Needle bearings
• Medium : Swiss Auto -Turned Parts
• Coarse : Rivet
• Extra Coarse : Forged part
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Tolerancing
Examples for
• Fine : Rollers for Needle bearings
• Medium : Swiss Auto -Turned Parts
• Coarse : Rivet
• Extra Coarse : Forged part
Note: Hybrid Tolerancing not allowed!
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Tolerancing
Tolerance on dims. Unless otherwise specified
CategoryClass
0.5 to 3mm
3 to 6 mm 6 to 30mm30 to
120mm
Fine +/-0.05
Medium ?
Coarse
ExtraCoarse
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Tolerancing
Tolerance on dims. Unless otherwise specified
CategoryClass
0.5 to 3mm
3 to 6 mm 6 to 30mm30 to
120mm
Fine +/-0.05
Medium +/-0.10
Coarse ?
ExtraCoarse
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Tolerancing
Tolerance on dims. Unless otherwise specified
CategoryClass
0.5 to 3mm
3 to 6 mm 6 to 30mm30 to
120mm
Fine +/-0.05
Medium +/-0.10
Coarse +/-0.30
ExtraCoarse
?
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Tolerancing
Tolerance on dims. Unless otherwise specified
CategoryClass
0.5 to 3mm
3 to 6 mm 6 to 30mm30 to
120mm
Fine +/-0.05
Medium +/-0.10
Coarse +/-0.30
ExtraCoarse
+/-0.50
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Tolerancing
Tolerance on dims. Unless otherwise specified
CategoryClass
0.5 to 3mm
3 to 6 mm 6 to 30mm30 to
120mm
Fine +/-0.05 +/-0.05 +/-0.15 +/-0.2
Medium +/-0.10 +/-0.10 +/-0.20 +/-0.30
Coarse +/-0.20 +/-0.30 +/-0.50 +/-0.80
ExtraCoarse
NA +/-0.50 +/-1.00 +/-1.50
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Tolerancing
Exclusive For Tool Drawings:
20,0 = 20+/-0.5
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Tolerancing
Exclusive For Tool Drawings:
20,0 = 20+/-0.5
20,00 = 20+/-0.05
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Tolerancing
Exclusive For Tool Drawings:
20,0 = 20+/-0.5
20,00 = 20+/-0.05
20,000 = 20+/-0.005
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Tolerancing
Company Standards for general Tolerances
IS 2102 for ‘Rubber Parts’ Anecdote
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Tolerancing
“Loose Tolerances tightly held are better than tight tolerances loosely held”
Centurion
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Tolerancing
ASSEMBLY
Interchangeable Assembly
Graded Assembly
Selective Assembly
? ? ?
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Tolerancing
Tolerance
Min Bore Max Bore
BORE FEATURES
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Tolerancing
Tolerance
Min Bore Max Bore
BORE FEATURES
Dist. Between axes = ?
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Tolerancing
Combined Representation of Bore
Min?
Max?
Tol?
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Tolerancing
Tolerance
Max Shaft
Min Shaft
SHAFT FEATURES
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Tolerancing
Tolerance
Max Shaft
Min Shaft
Combined
Representation
SHAFT FEATURES
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Tolerancing
Basic Size of Bore
Basic Size of Shaft
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Tolerancing
Line of zero deviation
Basic Size
Lower Deviation
Upper Deviation
BORE FEATURES
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Tolerancing
Line of zero deviation
Lower Deviation
Upper Deviation
Basic Size
SHAFT FEATURES
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Tolerancing
Line of zero deviation
Lower Deviation
Lower Deviation
Upper Deviation
BORE & SHAFT FEATURES
Upper Deviation
Basic Size
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Tolerancing
Feature Deviation
Bore Shaf t
Upper Max MaxLower Min Min From Basic Size
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Tolerancing
Feature Deviation
Bore Shaf t
Upper ES esLower EI ei* From Basic Size
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Tolerancing
FEATUREDEVIATION *
BORE SHAFT
UPPERLOWER
* FROM BASIC SIZE
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Tolerancing
Line of zero deviation
EI
ei
es
BORE & SHAFT FEATURES
ES
Basic Size
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Does Tolerance have a sign?
Answer in Part 2
Tolerancing