GD&T - Profile Tolerancing
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1 GD&T - Profile Tolerancing PMPA Technical Conference Rapid Response to Make the Cut Grand Rapids, MI April 11, 2016 Gary K. Griffith Corona, California
2 Gary K. Griffith 48 Years Exp. Technical Book Author Automotive Quality Assurance Aerospace Engineering Engineering Shop Technical Manufacturing Quality
3 Profile Tolerances Profile of a Line Individual Line Elements Profile of a Surface All Line Elements Collectively Profile tolerances are widely misunderstood
4 Profile Tolerances - Overview Profile was originally designed for mating contours Profile applies only to surfaces Profile is view-specific (applies only in view shown) Profile tolerances are automatically bilateral (U.O.S.) Profile requires basic dimensions (shape and/or location Profile tolerance may, or may not specify datums Profile cannot be applied at MMC Except on datums of size
5 Contours Irregular shapes A collective of various dimensions combined Radii Angles Etc. Profile would be necessary if all of the components of a contour are simultaneously related / engaged Not all contours need profile control
6 Profile Tolerances - Overview Profile of a Line Applies to individual line elements of the surface (one at a time) Profile of a Surface Applies to all line elements collectively (simultaneously)
7 Datums or No Datums? FAMILY SYMBOLS DATUMS? Form Tolerances Never Orientation Tolerances Always at least one Runout Tolerances Always at least one Location Tolerances Always at least one Profile Tolerances Depends!
8 Datums or No Datums? MATING CONTOURS TWO INTERFACES TWO DATUMS (NEED SHAPE & LOCATION CONTROL) MATING CONTOURS NO INTERFACES NO DATUMS (ONLY NEED SHAPE CONTROL)
9 Profile Inspection Comparator Using Overlays Thickness limited Overlays needed Cross-hairs where datums apply No cross-hairs where there are no datums Or a Vision System
10 Profile Inspection CMM Need GD&T Software Proper probes Decide points Best fit capability when there are no datums
11 Profile Inspection Fixture Variable Inspection Fixture Where datums apply Pantograph follows true profile template Dial indicator (or probe) must be perpendicular to the contoured surface Zeroed on the template``
12 Profile Tolerance Example (No Datum) THE TOLERANCE ZONE IS TWO LINES (+.0025) AROUND THE PERFECT PROFILE NOTE: BEST FIT IS ALLOWED DURING INSPECTION. Only shape is controlled Limited between X and Y
13 Profile Tolerance No Datums MYLAR OVERLAY Mylar does not need cross-hairs Best fit is allowed during inspection
14 Profile Tolerance No Datums MYLAR OVERLAY FOR THE COMPARATOR BEST FIT IS ALLOWED WHEN THERE ARE NO DATUMS
15 Profile Tolerance No Datums Mylar can be shifted or rotated for best fit
16 Profile Tolerance Datums Specified Two Datums Two Cross-hairs Controls shape and location Mylar needs cross-hairs
17 Profile Tolerance Datums Specified Part must be indexed into the zone. Mylar cannot be shifted. This part is not in profile tolerance Datums restrict best fit The surface must be within shape and location
18 Profile Tolerance Datums Specified This part is too thick for optical comparator use. A CMM would be necessary in this case. BETWEEN X AND Y LIMITS THE CONTROL
19 Irregular Features Mating Parts
20 Composite Profile Tolerance Loose tolerance for location from datums A and B Tighter tolerance for shape
21 Profile Tolerance Coplanar No Datums The two surfaces must be in-plane within.0005 Both surfaces establish Datum plane A Part must mount without wobble
22 Profile Tolerance Coplanar No Datums Profile controls coplanarity and flatness Both surfaces must be between two planes.0005 apart (FIM)
23 Profile Tolerance Coplanar Datums Applied Each surface can be no further away from datum plane A-B than.0025 This is not a FIM measurement
24 Profile Tolerance Coplanar - Datums Applied Part is mounted on datums A-B. Dial indicator is zeroed on datums A-B. Each surface must be from A-B.
25 Profile Tolerance Zone Profile All Around (View Specific) Limited Best Fit is Allowed
26 Profile Controls Size, Shape, and Location
27 Combined Controls (Profile and Position) Profile for shape and size Position for location
28 Profile to Locate a Surface XX Controls location, angularity and flatness
29 Unilateral Tolerance Zones Profile is needed to control contour shape, coaxiality, and location Blades must clear housing
30 Unilateral Tolerance Zones XX Phantom Line Method New Circle U Modifier (2009 Standard)
31 Profile Includes Coaxial Control (due to Datum A) XX This is controlling: Concentricity Straightness Angularity
32 Profile Using MMC Modifier (Clearance fit on datum holes) Datum shift is allowed if datums depart from MMC size
33 Griffith Training On-Site Tailored GD&T Training: Basic Intermediate Advanced Tolerance Stackup Analysis Functional Gage Design Inspection Quality Courses Consulting: Functional GD&T Drawing Reviews Tolerance Stackups Functional Gage Designs
34 Questions and Answers Need Training?
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