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ADVANCED MECHANICAL DRAFTING

ADVANCED MECHANICAL DRAFTING. LECTURE #10. RUNOUT. CIRCULAR RUNOUT. TOTAL RUNOUT. RUNOUT feature control frames. . . RUNOUT FRAMES ALWAYS CONTAIN: Geometric Characteristic Symbol Tolerance zone thickness Datum reference. RUNOUT FRAMES NEVER CONTAIN:

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ADVANCED MECHANICAL DRAFTING

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  1. ADVANCED MECHANICAL DRAFTING LECTURE #10

  2. RUNOUT CIRCULAR RUNOUT TOTAL RUNOUT

  3. RUNOUT feature control frames   • RUNOUT FRAMES • ALWAYS CONTAIN: • Geometric Characteristic Symbol • Tolerance zone thickness • Datum reference • RUNOUT FRAMES • NEVER CONTAIN: • Diameter Symbol • Material Condition modifier

  4. Zone size is thickness of band of tolerance RUNOUT tolerance zone shapes RUNOUT Area between two concentric circles TOTAL RUNOUT Volume between two concentric cylinders

  5.  .002 tolerance zone over entire surface DATUM AXIS A Rotate Part   DATUM PLANE B APPLICATION OF RUNOUT DRAWING INTERPRETATION

  6.  .005 tolerance zone at each circular element DATUM AXIS A Rotate Part   DATUM PLANE B APPLICATION OF RUNOUT DRAWING INTERPRETATION

  7.  .005 tolerance zone over entire surface DATUM AXIS A Rotate Part   DATUM PLANE B APPLICATION OF RUNOUT DRAWING INTERPRETATION

  8.    COMPOUND DATUMS • Allow two different features to act as one datum • Both serve as one datum, neither is primary nor secondary with respect to the other

  9. FORGING Any process which shapes solid metal without cutting • Forging processes • Hammer – swords, horseshoes, etc. • Drop – tools, coins, etc. • Press – same as drop without hard impact • Rolling – plate steel, sheet metal • Upset – fastener heads, spark plug ends, etc. • Extrusion – window frames, wire, etc

  10. FORGING CONSIDERATIONS • No tight tolerances • Hot or cold • Mismatch must be controlled • No sharp corners • Draft angles required in deep molds • Phantom lines show chip (areas that must be machined later) • May require two drawings (forging & machining)

  11. KNURLING – a forging process • Straight knurl • Increases effective shaft diameter • Used to create a press fit

  12. PITCH 96 STRAIGHT KNURL Ø.512 MIN AFTER KNURLING BEFORE KNURLING Ø.50 .62 FULL KNURL Dimensioning the Straight Knurlper ANSI Y14.5

  13. KNURLING – a forging process • Raised Diamond knurl • Provides gripping surface • 4 sizes available • DP 160 – very fine knurl • DP 128 – fine knurl • DP 96 – medium knurl • DP 64 – coarse knurl • Pitch 96 most common

  14. PITCH 96 RAISED DIAMOND KNURL .25 Ø.50 .62 FULL KNURL Dimensioning theRaised Diamond Knurlper ANSI Y14.5

  15. Application to GSK

  16. GSK DESIGN

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