AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
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www.newmaple.com/video/autocad0006

1. Title block brief introduction

2. Text height
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3. Viewport

) s/ y/ x$ _7 h8 y$ \4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad

special symbols
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) t- N9 o& v% \4 Y: q. T%%P plus and minus sign
%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
AutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
www.newmaple.com/video/autocad0007
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A real sample to review lecture 6
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Introduction Roughness
Quick check hole size and position
Introduction O-ring groove

Surface roughness
# M! {& J( e0 H, _$ O•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
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•        250 micro-inch – forging surface
! l% G1 d' Y6 P/ Y•        125 rough machine, 32 fine machine

  O- M% E+ t- VInch size O-ring
1 }4 w+ o2 B% v# Q+ {: `' P( o+ M9 ?•        O-ring number 232
, S+ n* m' q  y6 R) f6 y3 [•        nominal size 2.75”x3”x1/8”
•        Actual size 2.734”x3.012”x0.139”
•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
•        One of OD or ID is close standard size
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