Post on 05-Jan-2016
description
ADVANCED MECHANICAL DRAFTING
LECTURE #10
RUNOUT
CIRCULAR RUNOUT
TOTAL RUNOUT
RUNOUT feature control frames
RUNOUT FRAMESALWAYS CONTAIN:
• Geometric Characteristic Symbol
• Tolerance zone thickness
• Datum reference
RUNOUT FRAMESNEVER CONTAIN:
• Diameter Symbol
• Material Condition modifier
RUNOUT tolerance zone shapes
RUNOUT
Area between twoconcentric circles
TOTAL RUNOUT
Volume between twoconcentric cylinders
Zone size is thickness of band of tolerance
APPLICATION OF RUNOUT
Rotate Part
.002 tolerance zone over entire surface
DRAWING
DATUM AXIS A
DATUM PLANE B
INTERPRETATION
APPLICATION OF RUNOUT
Rotate Part
DRAWING
DATUM AXIS A
DATUM PLANE B
INTERPRETATION
.005 tolerance zone at each circular element
APPLICATION OF RUNOUT
Rotate Part
DRAWING
DATUM AXIS A
DATUM PLANE B
INTERPRETATION
.005 tolerance zone over entire surface
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
• 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
Any process which shapes solid metal without cutting
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 Knurlper ANSI Y14.5
PITCH 96 STRAIGHT KNURL Ø.512 MIN AFTER KNURLING
Ø.50BEFORE 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 theRaised Diamond Knurl
per ANSI Y14.5
PITCH 96 RAISED DIAMOND KNURL
Ø.50
.62 FULL KNURL
.25
Application to GSK
GSK DESIGN