AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
! ]/ B) h# b5 ihttp://www.newmaple.com/forumdisplay.php?fid=28

. r) |% R1 j1 O% owww.newmaple.com/video/autocad0006
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1. Title block brief introduction

2. Text height

5 b3 Q" Q) ~" d3. Viewport
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6 {3 a% ?+ \$ x" k, F1 b7 b4. Dimensions style brief introduction
2 b! ~$ i( d3 V0 \$ H•        Tolerance in Mechanical / Autocad
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special symbols
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%%P plus and minus sign
0 k8 t7 D4 w% P3 |%%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)
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A real sample to review lecture 6

! ^" Q6 [# D) J% [3 X8 n8 Q- ]Introduction Roughness
Quick check hole size and position
2 j( s9 f: n, _; B$ M; IIntroduction O-ring groove
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5 D. A/ W3 y6 |$ PSurface roughness
•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
1 C- h3 b# Y( B$ W(250X25.4X10-3)
•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
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9 g4 m! v' {( C% |' @" n' X& xInch size O-ring
•        O-ring number 232
: e9 G; u! D3 z; Y" O* P$ `2 q7 ~•        nominal size 2.75”x3”x1/8”
- |. R8 C% ?9 h•        Actual size 2.734”x3.012”x0.139”
  w' k& M9 A/ U' R9 c•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
* H5 E1 n, n/ L' J6 g•        One of OD or ID is close standard size

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