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ADVANCED MECHANICAL DRAFTING

ADVANCED MECHANICAL DRAFTING. LECTURE #23. PROFILE TOLERANCE ZONES. PROFILE OF A LINE. PROFILE OF A SURFACE. PROFILE OF A LINE. Forces a surface to have a profile of some desired shape No datum reference No diameter symbol Cannot be modified Dimensions defining profile shape are basic.

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ADVANCED MECHANICAL DRAFTING

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  1. ADVANCED MECHANICAL DRAFTING LECTURE #23

  2. PROFILE TOLERANCE ZONES PROFILE OF A LINE PROFILE OF A SURFACE

  3. PROFILE OF A LINE • Forces a surface to have a profile of some desired shape • No datum reference • No diameter symbol • Cannot be modified • Dimensions defining profile shape are basic

  4. .812 R.005 +  R.005 + 1.250 1.12 .006 WIDE 2D TOLERANCE ZONE .81 Applying Profile of a Line INTERPRETATION ALL DIMENSIONS CONTROLLING THE SHAPE OF THE ZONE ARE BASIC DRAWING

  5. PROFILE OF A SURFACE • Forces a surface to have a profile of some desired shape • May reference a datum • No diameter symbol • Cannot be modified • Dimensions defining profile shape are basic

  6. .812 R.005 +  R.005 + 1.250 1.12 .006 WIDE 3D TOLERANCE ZONE .81 A Applying Profile of a Surface INTERPRETATION ALL DIMENSIONS CONTROLLING THE SHAPE OF THE ZONE ARE BASIC DRAWING

  7. Size of contact area (if specifying an area) Ø.25 A1 Contact point identifier DATUM TARGETS • Used to define simulated datums on irregular or curved surfaces • Exact locations of points, lines, or areas of contact are specified with basic dimensions • Datum target symbol

  8. .50 .50 .25 .50 A1 A2 A3 .25 DATUM PLANE A A LOCATING PINS DATUM TARGET POINTS DRAWING INTERPRETATION

  9. Ø.19 .50 .50 .25 .50 Ø.19 C2 C1 C3 .25 Ø.19 DATUM PLANE C C Ø.19 LOCATING PINS DATUM TARGET AREAS DRAWING INTERPRETATION

  10. F 1.50 F1 F1 A DATUM LINE F LOCATING PIN DATUM PLANE A DATUM TARGET LINES DRAWING INTERPRETATION

  11. 4X 90º X.XXX 4XØ.XXX (X/X) THRU .XXX-XXUNC-2B   ØX.XXX X.XXX LOCATINGGSSPMOUNTING HOLES

  12. 2X X.XXX 2X X.XXX FOR BOTTOM TAPPED HOLES, MAKE DRILL DEPTH EQUAL THREAD DEPTH 2X X.XXX 4XØ.XXX (X/X)  .XX .XXX-XXUNC-2B  .XX   2X X.XXX LOCATING SIDE MOUNTING HOLES

  13. 8XØ.XXX (X/X)  .XX .XXX-XXUNC-2B  .XX   .XXX .XXX Ø  .XX   2X X.XXX X.XXX 2X X.XXX X.XXX B 2X X.XXX X.XXX 2X X.XXX .XXX .XXX Ø  .XX 3X X.XXX 2X X.XXX 2X X.XXX 2X X.XXX LOCATINGCOVER PLATEMOUNTING HOLES

  14. OTHER HOUSING DESIGN CONSIDERATIONS • All bores, holes, bosses, etc. (anything cylindrical) must have centerlines • Lengths and diameters of bosses must be shown • The center hole in the top of the housing must be large enough to clear the top of the yoke while shifting gears • The drain hole and filler hole must be located, but may not have to be positioned • The lower bearing bore houses a closed-end bearing. A smaller thru hole allows for removal of a worn-out bearing • All fillets and rounds must be sized, but this may be done in the title block • Define surface finishes where appropriate • Add all dimensions necessary to locate and size all features

  15. FINAL EXAMINATION PREVIEW • Threads • Nomenclature (names of thread parts) • Representations (methods of drawing threads) • Complete threaded hole callouts • Number of threads per inch for given size, form, and series • Diameter of thread for a given thread specified by number • Required tap drill for given internal thread • Required position tolerance for given thread and fastener condition • Complete callout for given fastener

  16. FINAL EXAMINATION PREVIEW • Threaded Fasteners • Screw feature dimensions (head thickness, width, etc.) • Matching • Match geometric symbols, modifiers, etc. to definitions • Feature Control Frames • Identify all parts of a typical feature control frame • Maximum Material Condition (MMC) • Determine MMC of hole and shaft with given dimensions • Dimension Types • Identify different types of dimensions by appearance • Dimension Classes • Know the two things that any dimension can do

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