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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 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
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
.002 tolerance zone over entire surface DATUM AXIS A Rotate Part DATUM PLANE B APPLICATION OF RUNOUT DRAWING INTERPRETATION
.005 tolerance zone at each circular element DATUM AXIS A Rotate Part DATUM PLANE B APPLICATION OF RUNOUT DRAWING INTERPRETATION
.005 tolerance zone over entire surface DATUM AXIS A Rotate Part DATUM PLANE B APPLICATION OF RUNOUT DRAWING 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
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
PITCH 96 STRAIGHT KNURL Ø.512 MIN AFTER KNURLING BEFORE KNURLING Ø.50 .62 FULL KNURL Dimensioning the Straight Knurlper ANSI Y14.5
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
PITCH 96 RAISED DIAMOND KNURL .25 Ø.50 .62 FULL KNURL Dimensioning theRaised Diamond Knurlper ANSI Y14.5
