AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
' m" O4 z# n0 l" Jhttp://www.newmaple.com/forumdisplay.php?fid=28
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www.newmaple.com/video/autocad0006
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) }# G6 S# @) }# q, q* w/ a1. Title block brief introduction

2. Text height

3. Viewport

4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad

special symbols
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: ~2 Q( p5 X& O; V9 Z- G%%P plus and minus sign
+ A) x6 @6 e3 b, x) _3 [0 {%%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

# u& @% H5 q* l- E% K# BA real sample to review lecture 6

Introduction Roughness
Quick check hole size and position
Introduction O-ring groove
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# r1 |: L  m$ X5 b: @Surface roughness
# q' U6 _% u* A+ E; @•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
1 k/ K9 s$ c, k( Q  M! k/ Q(250X25.4X10-3)
+ |: e- ?7 a. D: m3 B•        250 micro-inch – forging surface
, b5 w% r% _- h•        125 rough machine, 32 fine machine
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Inch size O-ring
/ i7 F9 e" f  ~- X# q& @•        O-ring number 232
# }# o( p* M; g2 T' z•        nominal size 2.75”x3”x1/8”
•        Actual size 2.734”x3.012”x0.139”
" k3 P4 `$ u0 F5 o; g•        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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http://www.newmaple.com/forumdisplay.php?fid=28