Index Of: The Journeyman’s Guide to Geometric Dimensioning and Tolerancing

Additional tolerance (Bonus tolerance) 35-36, 124-126, 130-131, 134-135, 139-140, 143, 156, 158
defined 139-140
Ambiguity, Avoiding 1, 4, 137, 145, 215, 222
ASME Y14.5M-1994
conventions 3
defaults 3, 15, 31-32, 34, 139, 174
definitions 29-31
fundamental rules 31-32
importance of 1
Basic Dimensions 6, 29, 37-39, 162-163, 164-173, 213-214, 227, 229-235
Boundary, inner 29
Boundary, outer 29
Chained Dimensions 37, 137
Circularity 5, 34, 85, 88-89
at a glance 88
Concentricity 5, 34, 85, 194, 196, 197
Converting +/- to positional tolerances 146-147
Coordinate systems 46, 49-50, 60-61, 68, 76-81, 159-163
Coplanarity - Controlling 63
Cylindricity 5, 34, 85, 90-91
at a glance 90
unit-basis 90
Datum Feature Simulators 29, 46-81, 148-154, 160, 210, 251
for Primary Datum Features 52-55, 72-74
Physical Datum Feature Simulators - Imperfect 52-55, 72
Precedence 51, 76-81, 148-154, 160
Simulated Datum and 72
Virtual Datum Feature Simulators - Perfect 29, 52-55
Datum Features 6, 8, 29, 34, 46-83, 120, 127, 132, 144, 148-154, 160, 174-179
Bounded 48, 64
Complex 48, 64, 65
Datum Feature Symbol 6, 7, 10, 62-64, 65, 257-259
Datum Features of Size 48, 51, 52-55, 62, 69-70, 73-75, 78-81, 82, 148-154, 204, 257-259
Datum Identifying Letter 48, 66
Definition 29, 46
Degrees of Freedom and 49, 52-55, 60-61, 68, 77, 79, 81
Functional 46
Labeling 62-64
Multiple Datum Features 63, 204
Partial 48
Planar 48, 51, 52, 62, 63, 72, 76-81
Precedence 9, 45, 51, 65, 68, 70, 76-81, 118, 120, 127, 132, 140, 148-154, 159-163, 198-199, 257-259
selection criteria 46, 48
Tolerancing (Qualifying) 52-55, 76, 78, 80, 82
Datum Reference Frames 9, 46-81, 86, 88, 90, 92, 120, 127, 132, 136, 194, 195, 198, 199, 213, 214
coordinate systems defined by 46, 49-50, 51, 60-61, 76-81, 160-163
Degrees of Freedom and 49, 52-55, 60-61, 68, 77, 79, 81
functional 46
Functional 46
in Composite Feature Control Frames 140-142, 217-218, 164-185, 229-235
Rules for 140
Precedence 9, 45, 51, 65, 68, 70, 76-81, 118, 120, 127, 132, 140, 148-154, 159-163, 198-199, 257-259
Datum Targets 29, 48, 65-67
Datum, Simulated 29, 46
Datums 8, 10, 29, 38-39, 40, 46-81, 120, 127, 132, 159-163, 257
Datum Feature Simulators and 46-47, 56-61, 72
Datum Features and 8-9, 46-48, 50-55, 56-81
Datum Reference Frames and 46-47, 51-55, 68, 76-81
Definition 29, 46
Feature Control Frames and 8-9, 140-141
Precedence 9, 45, 51, 65, 68, 70, 76-81, 118, 120, 127, 132, 140, 148-154, 159-163, 198-199, 257-259
Simulated 72
Degrees of Freedom 49-50, 52-55, 60-61, 68, 77, 79, 81, 141
Compared with 3-2-1 68
Dimension, Basic 29
Dimension, Reference 29
Dimensioning and tolerancing philosophy 1-4
avoiding ambiguity 1
functional dimensioning and tolerancing 4
Dimensioning Requirements 37-39, 65-66, 86, 88, 90, 92, 120, 127, 132, 136, 194, 195, 198, 199, 213, 214
Drawings 6
Envelope, Actual Mating 29-30, 40-45, 51, 73-74, 115-117, 118-119, 159-163
Related to a Datum Reference Frame 40-45, 51
Related to the Feature 40-45, 51
Feature Control Frames 3, 6-10, 33, 34, 86, 88, 90, 92, 120, 127, 132, 136, 140, 142, 164-173, 174-179, 188-189, 194, 195, 198, 199, 213, 214, 217, 257-259
BOUNDARY with 27, 118, 120, 127, 132, 136, 138
Compartments 8-10
Composite 10, 86, 92, 95, 136, 140-142, 164-185, 213, 214, 229-239
Linking Lower Segments of 174-179
Contents 3, 7-10
Datum Feature Symbol and 62-64
INDIVIDUALLY with 257-259
Modifiers in 8, 9, 33-34
Multiple Segments (more than two) 140
on the drawing 6
projected tolerance zones in 10
SEP REQTS with 175-176
SIM REQTS with 174-179
Single Segment 7-10, 86, 88, 90, 92, 95, 120, 127, 132, 136, 194, 195, 198, 199, 213, 214
Feature of Size 6, 8, 15-28, 30, 48, 51, 52-55, 62, 69-70, 73-75, 78-81, 82, 92, 94, 95, 97-108, 109, 118, 120, 127, 132, 137-142, 144, 148-154, 204, 257-259
as Datum Features of Size 48, 51, 52-55, 62, 69-70, 73-75, 78-81, 82, 148-154, 204, 257-259
Axes of 115-117
definition of 30
in Functional Gages 148-154
Material Condition Modifiers and 33, 35-36
positional tolerance and 136, 137-140
rule #1 and 15-28
Tolerance Zones for 109
Allowable Variation in 110-114
Virtual Condition of 97-108
Feature, Axis of 30
Feature, Center Plane of 30
Feature, Derived Median Line of 30
Feature, Derived Median Plane of 30
Features 1-2, 6, 15-28, 29, 46, 48, 51-55, 62-64
bounded 27-28, 33, 118, 120, 127, 132, 136, 137-138
definition of 30
Fixed fastener situation 187
formulas 187, 191-193
orientation tolerance and 188
positional tolerance and 187, 188
projected tolerance zone and 187
Fixtures 46, 148-154
Flatness 86-87
and composite feature control frames 86
at a glance 86
Floating fastener situation 186
formula 186
positional tolerance and 186
Form Tolerances 5, 34, 86-96
Circularity 88-89
At a glance 88
unit-basis 88
Cylindricity 90-91
At a glance 90
unit-basis 90
Flatness 86-87
and composite feature control frames 86
At a glance 86
Rule #1 and form control 15-24
Straightness 92-96
and composite feature control frames 92, 95
At a glance 92
derived median line and 94
in two directions 96
lines elements and 93
material condition modifiers and 92, 94
RFS vs. MMC 94
unit-basis 92, 95
view dependency and 96
Format, plus/minus tolerances 11
dimensional limits and 11-13
effect on manufacturing process 12
effect on target value 12
equal bilateral 11-12
leading zeroes 11
legal differences 12
limit dimensions 11-12
number of decimal places 11
SPC and 12
trailing zeroes 11
unequal bilateral 11-12
unilateral 11-12
Free-State and Restrained Parts 32, 247-256
Default condition per ASME Y14.5M-1994 32
Deformation Due to Assembly Forces 247-255
Distinction Between Rigid and Non-Rigid 247
Flexible Gasket Example 256
Free State Symbol 33-34, 248
Functional Dimensioning and Tolerancing and 247-255
Invoking Free State on a Non-Rigid Part Drawing 248
Non-Rigid Parts 32, 247-248
Adjustment Note for Non-Rigid Parts 256
Restraint Forces 247-248
Restraint Notes 248, 255
Rigid Parts 32, 247
Full Indicator Movement (FIM) 30, 200, 205
Functional dimensioning and tolerancing 4
Functional Gaging 46, 148-154
Fundamental Rules 31-32
GD&T, Comparison with +/- 137, 145-147
GD&T, definition of 1
Geometric Characteristic Symbols 5
Geometry, types of 2
Individual 257-259
Journeyman's Guide, intent 1
Justification for GD&T i, 1, 35-36, 44, 109, 115, 137, 215
Material condition modifiers 30, 33, 35-36, 92, 94, 124-126, 130-131, 134-135, 136, 139-140, 143, 148-154, 155, 156-158,
Additional (bonus) tolerance and 35-36, 124-126, 130-131, 134-135, 139-140, 143, 156-158
choosing the correct modifier 35-36, 156-158
alignment 157
combination of factors 157
edge distance or wall thickness 156
fit or clearance 156
selection criteria 156-158
Default 36, 139
difference between the material condition modifiers 35-36
effect on tolerance zone 35-36
LMC 8, 15-27, 30, 33-36, 84, 86, 92, 100-102, 106-108, 120, 127, 132, 136, 138-140, 156-158, 196, 198, 199, 213, 214
and internal and external features 35-36, 97-108
definition of 35-36
MMC 8, 15-27, 30, 33-36, 51, 54-55, 84, 86, 92, 94, 97-99, 103-105, 120, 124-126, 127, 130-131, 132, 136, 138-142, 143, 148-154, 155, 156-158, 188, 196, 198, 199, 213, 214
and internal and external features 35-36, 97-108
definition of 35-36
RFS 9, 30, 33-36, 48, 51, 52-54, 73-74, 85, 86, 88, 90, 92, 94, 120, 123, 126, 127, 129, 132, 133, 136, 139, 156-158, 159-163, 188, 194-196, 198, 199, 213, 214
ANSI Y14.5M-1982 35
as a subset of MMC and LMC 36, 139
definition of 35-36
symbols for 33, 35
Orientation Tolerances 5, 34, 118-135
Angularity
At a glance 132
By Element 118
Comparison of the Orientation Tolerances 118
Features of Size and 118, 120, 123-126, 127, 129-131, 132, 134-135
Parallelism
At a glance 127
Perpendicularity
At a glance 120
Planar Features and 120, 121-122, 127, 128, 132, 133
Related to more than one Datum 118, 120, 122, 127, 132
Plane, Tangent 30
Positional Tolerances 5, 34, 136-193
At a glance 136
Additional (bonus) tolerance and 139-140, 143, 156
BOUNDARY with 136, 137-138
Circumscribing a cylindrical positional tolerance zone about a square +/- tolerance zone 146-147
Compared to +/- 137, 145-147
Composite Position 136, 140-142, 164-185
Concentricity and 194
Converting +/- to Positional Tolerances 146-147
Datum Reference Frames and 136, 137-142, 148-154, 159-163, 164-185
Evaluating a Positional Tolerance Specification 159-163
Features of Size and 97-108, 109-114, 115-117
Functional Gaging and 148-154
History of 137
in Fixed- and Floating-Fastener Formulas 186-193
Material Condition Modifiers and 136, 139-140, 143, 148-154, 155, 156-158
Projected Tolerance Zones and 136, 187, 188-193
Separate Requirements and 175-176
Simultaneous Requirements and 174-179
Surface vs. Axis 139
Symmetry and 195
Tolerance Zone Geometry for Features of Size 109-114
Virtual Condition and Resultant Condition and 97-108
Zero Positional Tolerance 155
Profile Tolerances 5, 34, 213-246
All-Around 227
Avoiding Guesswork with 215
Avoiding Combining +/- and Profile 213-215
Basic Dimensions and 213-215
Benefits of 213-218, 219
Complex Surfaces and 213-218, 219, 229-235
Composite Profile 213-214, 217-218, 229-239
Unilateral Composite Profile 236-239
With Sim Reqts Specified 232-234
Without Sim Reqts Specified 229-231, 235
Coplanarity - Controlling 63
Datum Reference Frames and 213-214, 217,
Defining the Extents of Application 222
Direction of Tolerance 215
Equal Bilateral 215, 223
Limited Application 216-217, 228
Between Points 217, 228
Limited Area of Application 216
Limited Length of Application 216
Profile of a Line 5, 34, 215-218, 220, 221, 231, 240-246
ASME Y14.5M-1994 vs.
ASME Y14.5.1M-1994 Interpretations
240
At a glance 213
Compared with Profile of a Surface 221
Composite Feature Control Frames and 213
What it Really Means 240-246
Profile of a Surface 5, 34, 214-218, 229-239
At a glance 214
Compared with Profile of a Line 221
Composite Feature Control Frames and 214, 229-239
Similarities to +/- 215
Simultaneous Requirements and 218, 232-234
Without Sim Reqts Specified 235
Tolerance Zones 215-216, 219-221, 223-228, 229-239
True Profile and the Profile Tolerance Zone 215
Types of Control 213-218
Unequal Bilateral 215, 224
Unilateral 215, 225-226
Unit Basis 218
Universal Applicability of 213-215
Projected tolerance zones 10, 33-34, 136, 187, 188-193
effect inside and outside the part 190
formulas to calculate equivalent tolerance when projected tolerance is not specified 191-193
in fixed fastener calculations 187
methods of specifying 188-189
reasons for 188-189
reluctance of companies to use 188
Symbol 10, 33-34
Threaded Holes and 187, 188-193
Radius Dimensions 14
Reference Dimensions 6
Repetitive Datum Reference Frames 257-259
Individual, Use of 257-259
Resultant Condition 30, 97-108
Rule #1 15-28, 84, 116
Violation of 15, 94, 95
Runout tolerances 5, 34, 198-212
Circular Runout 198, 200-202, 206-207, 209-212
And Inspection 200
Circular Runout vs. Total Runout 198, 199, 209
Form Error vs. Location Error 210-212
Full Indicator Movement (FIM) 30, 200, 205
Multiple Datum Feature and 204
Surfaces of Revolution and 203
Total Runout
And Inspection 201-202
Separate requirements 174-176
Invoking 175-176
Simultaneous requirements 164, 169, 174-179, 180-185, 218, 229-235
Default condition per ASME Y14.5M-1994 174
Invoking 174-179, 180-185
Overriding 175-176
Size, Actual 30
Size, Actual Local 15-24, 31
Size, Actual Mating 15, 31, 35-36, 139-140, 156-157
Size, Limits of 11-13, 15-24, 31
Size, Nominal 31
Size, Resultant Condition 31
Size, Virtual Condition 31
Straightness 92-96
and composite feature control frames 92, 95
at a glance 92
derived median line and 94
in two directions 96
lines elements and 93
material condition modifiers and 92, 94
RFS vs. MMC 94
unit-basis 92, 95
view dependency and 96
Surfaces of Revolution 203
Symbology 3, 5-10, 62, 65-66
Symmetry 5, 34, 195, 196-197
Tolerance 31
Tolerance, Bilateral 31
Tolerance, Geometric 31
Tolerance, Unilateral 31
True Geometric Counterpart 31
True Position 31
Units 3
Virtual Condition 31, 94, 97-108