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: Diameter Symbol Material Condition modifier

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

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

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

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

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   

Any process which shapes solid metal without cutting 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

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)

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

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

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

Dimensioning the Raised Diamond Knurl per ANSI Y14.5 PITCH 96 RAISED DIAMOND KNURL .25 Ø.50 .62 FULL KNURL

Application to GSK

GSK DESIGN