Index Of: Tolerance Stackup, Tolerance Analysis and Tolerancing Manual: Plus and Minus Edition


Accuracy and precision3, 19
Ambiguity20
ASME Y14.5M-19942
 rule #12
Assembly Process20, 28, 79-81
Assembly Process Variation20, 28, 79-81
Assembly shift20, 28-33, 36, 42-44, 47, 48-51, 53, 63-64, 67-69, 78, 79, 80, 91, 92, 93, 103, 104, 106, 110, 111, 112, 116, 119, 123, 124, 128, 131, 132, 153, 154, 157, 158
 calculations30, 43, 50, 64, 69, 103, 119, 120, 124, 127, 128, 132, 155, 159
 fastener diameters used in29
 definition of28
 direction of110-112
 labeling in the tolerance stackup sketch29, 93
 effect of assembly forces on28, 29, 32, 33, 79-81
 effect of mating features on28-32, 78-81, 85
 fixed-fastener calculations and30, 31, 32, 85
 floating-fastener calculations and30,  32, 78-81
 reducing total variation with31-33
 reporting in a tolerance stackup report29, 103,  104
 rotational assembly shift120-133
 formulas and calculations121-125, 129-133
 reporting in a tolerance stackup report120, 124, 125, 128, 132, 133
 rules for28-33
 whether to include in the Tolerance Stackup31-33
Assumptions18, 20, 21, 23, 28, 31, 33-35, 42, 52, 54, 55, 56, 78, 81, 85, 88, 96, 102
 default conditions in this text32, 35
 framing the problem35
 importance of stating33
 reasons for33
 catalog and purchased parts34
 incomplete drawings33
 missing information33
 relying on manufacturing process tolerances33-34
Central limit theorem9-10
 Gaussian distribution and9-10
Chain of dimensions and tolerances17, 18, 19, 20, 23-27, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 51, 52, 53, 58, 60, 62, 64, 66, 68, 69, 86, 88, 92, 93, 95, 98, 100, 103, 104, 106, 107, 111, 112, 141, 144, 148, 152, 156, 160
 definition of23, 53
 moving from one interface to another in51-53
 reason for term53
Converting plus/minus dimensions and tolerances into equal bilateral format11-14
 limit dimensions11
 and mean shift15-16
 unequal bilateral12
 unilateral negative14
 unilateral positive13
Dimensions2, 3, 4-5, 6, 7
 types of4-5
 format of7
 metric7
 US inch7
Direction of dimensions and tolerances in the tolerance stackup20, 91, 106-115
 rules for including20, 106-107
 tolerance stackup direction and20, 106-107
Features2-3
Feature of size2, 34, 52
 rule #1 and2
Fixed fastener situation29-31, 34, 70-85
 assembly process and85
 assumptions85
 assembly shift and29-31, 34, 85
 calculations72-74, 82-83, 85
 defined70, 81
 example of82
 formula82-83, 85
 interrelationship between part tolerances82-84
 Total Location Tolerance and70-74
 projected tolerance zone and84-85
Fixtures18, 20, 28, 79
 chain of dimensions and tolerances and18
 tolerances of18
Floating fastener situation29-31, 34, 70-85
 assembly process and77-81
 assumptions81
 assembly shift and78-81
 calculations72-74, 75-76, 78
 defined70, 75
 effect of gravity and79-80
 example of75
 formula75-76, 78
 interrelationship between part tolerances76-77
 Total Location Tolerance and70-74
Format, plus/minus tolerances6-10, 11-16
 conversion into equal bilateral11-14
 dimensional limits and6-10
 effect on manufacturing process6-10
 effect on target value6-10
 equal bilateral6, 7
 examples of7
 legal differences6-10
 limit dimensions6, 7
 rules for7
 leading zeroes7
 number of decimal places7
 trailing zeroes7
 SPC and9-10
 unequal bilateral6, 7
 unilateral6, 7
Functional dimensioning and tolerancing4, 5 , 19-20, 29, 36, 88, 134
 and arrangement of dimensions5
 Dimensioning strategy4
 justifications for5, 19-20
 tolerance stackups and19-20
Interchangeability1
Loop (see Chain of dimensions and tolerances)
Manufacturing processes2, 3, 4, 6, 9, 10, 19, 20, 21, 29, 54-57, 158
Mean shift15-16
 calculation of15-16
 definition of15
 effect on Tolerance Stackup15-16
 sign and direction of16
Moving from one part to another in a tolerance stackup51-53
 complex-curved interfaces52
 disclaimer53
 feature-of-size interface52-53
 planar interface52
Nominal1, 2, 3, 4, 6, 9, 10, 11, 54-55, 100
 dimension value and6-10
 manufacturing nominal6-10
 math-data/model-data and2-3
 mean shift of11-16
 SPC and9-10
 statistical tolerance stackups and54-55
Probability23, 54-57
Root-sum-square (RSS)55-56
Statistical Process Control (SPC)9-10, 55-57
Statistical tolerance stackup19, 20, 21, 54-69, 95, 101
 adjusted statistical tolerance stackup101
 appropriateness of54
 number of dimensions and tolerances and54
 conditional assumptions54
 manufacturing process controls and54-55
 Monte-Carlo55
 probability and54-57
 root-sum-square (RSS) and55-56
 definition of55-56
 formula for56
 process related assumptions and54-57
 standards deviations (σ) and57
 statistical process control (SPC) and55-57
 Cp & Cpk55
Tolerances3, 6-10, 11-16, 21
 conversion of +/-11-16
 definition of3
 format of6-10, 11-16
 effect on manufacturing process6-10
 effect on target value6-10
 equal bilateral6-7
 examples of7
 legal differences6-10
 limit dimensions6, 7
 rules for7
 SPC and9-10
 unequal bilateral6, 7
 unilateral6, 7
 importance of specifying21
 types of5
Tolerance analysis1, 17-22
 computer modeled20
 definition of17
 methods and types of20-21
 reasons for17-19
 statistical20-21, 54-69
 three-dimensional20, 55
 Monte-Carlo55
 worst-case (arithmetic)20-21, 23-53
Tolerance stackup17-19
 assumptions in20, 21, 23, 33-35, 52, 54, 55, 56, 78, 81, 88, 96, 102
 chain of dimensions and tolerances in17, 18, 19, 20, 23-27, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 51, 52, 53, 58, 60, 62, 64, 66, 68, 69, 86, 88, 92, 93, 95, 98, 100, 103, 104, 106, 107, 112, 141, 144, 148, 152, 156, 160
 and decision making17-19
 definition of17-18
 determining which dimensions and tolerances to include19-20, 106-115
 direction of20, 106-115
 effect of assembly process on28, 79-81
 effect of dimensioning and tolerancing schemes on19-20
 effect of part and assembly geometry on19, 106
 moving from one part to another in51-53
 purpose of18-19
 rotation of parts within a linear tolerance stackup55, 110, 115, 116-133
 comparisons of translational variation versus rotational variation in a linear tolerance stackup116-133
 effect on the tolerance stackup116-117
 locating features closer together125-133
 locating features farther apart117-125
 reporting in a tolerance stackup report120, 125, 128, 132-133
 statistical19, 20, 21, 54-69, 95, 101
 root-sum-square (RSS)55-56
 worst-case (arithmetic)10, 19, 21, 23-53, 54, 56, 101
Tolerance stackup report94-105
 Advanced Dimensional Management’s tolerance stackup report form36, 94-105
 as a communication tool94-95, 99
 consistency and94-95
 data fields in95-102
 decision making and94-95
 general guidelines for description, part number and revision information103
 guidelines for entering dimension and tolerance data104-105
 reasons for94-95
 step-by-step instructions for filling out the Advanced Dimensional Management tolerance stackup report form95-102
 assumptions block102
 data entry block98-100
 notes block101-102
 results block100-101
 suggested action block102
 tracking and title block data96-98
Tolerance stackup sketch23-27, 29, 37, 39, 41, 43, 46, 49, 58, 60 , 62, 64, 66, 68, 86-93, 106, 108, 111, 141, 144, 148, 152, 156, 160
 annotation in91-93
 assembly shift91-93
 contributing dimensions and tolerances91-93
 dimension direction labels24-27, 91-93
 identification of the distance or gap being studied23, 91-93
 item numbers91-93
 part identification91-93
 title and reference information91-93
 tolerance stackup direction24-27, 91-93
 chain of dimensions and tolerances and86, 88, 91
 as a communication tool88, 89, 91, 93
 content of88-90
 correlating with the tolerance stackup report91-93
 importance of86, 106
 part and assembly geometry in88-90
 clarity and89
 scale of89-90
 sources of89
 reason for86, 106
 required information86-88
 step-by-step directions for completing92-93
 timing of86
 visualization of the problem and86, 91-93, 106
Trigonometry20, 23, 52, 106-133
 converting angular dimensions and tolerances into linear units112-115
 like triangles117
 projection into the tolerance stackup direction20, 52, 106-115
 rotation of parts within a linear tolerance stackup55, 116-133
Units5, 6, 11, 97, 98, 115-116
 determining which units to report in a tolerance stackup115-116
Variation1-3, 4, 17-21, 23, 27, 28, 29, 31, 35, 47, 54, 55, 70, 78-81, 86-88, 106, 110, 116-117
 prediction of
 by a tolerance stackup18, 20
 reducing predicted18
 fixturing18
Worst-case tolerance stackup10, 19, 21, 23-53, 54, 56, 101
 conditional assumptions23, 33-35, 52
 step-by-step procedure23-27
 probability and23