AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
4 g! v9 v2 d- ^9 R/ h5 t: Z) Chttp://www.newmaple.com/forumdisplay.php?fid=28
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www.newmaple.com/video/autocad0006
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+ t. l4 T, k. ]+ z1. Title block brief introduction

2. Text height

4 A. l& r, M9 U( V8 ~5 {- n8 |3. Viewport
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+ b; K1 D3 F; O8 c* R8 ~3 \: v4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad
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special symbols
%%D degree sign
1 D1 o; |  K; w%%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
6 h9 `! |" w# ]! w" a- H$ JNew Maple AutoCAD (7)
# u% D8 b9 w$ H1 pwww.newmaple.com/video/autocad0007

' z2 K* I! F  Z, gA real sample to review lecture 6
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Introduction Roughness
& ?5 Y4 ?, S1 N+ dQuick check hole size and position
Introduction O-ring groove
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' Y7 e" J9 w3 H+ W7 i& S! `1 r/ RSurface roughness
7 w8 h7 [, C5 J•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
# s  L; {# I6 W9 Y, s7 j9 K/ V2 G(250X25.4X10-3)
8 f2 w+ O- v# [% q: |3 B" i6 ^•        250 micro-inch – forging surface
- [! _+ E& k0 p, _9 G) Z•        125 rough machine, 32 fine machine

  N! W9 o& _% v. _. bInch size O-ring
•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
•        Actual size 2.734”x3.012”x0.139”
  U$ n+ d0 w- q! `/ b/ N•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
•        One of OD or ID is close standard size

http://www.newmaple.com/forumdisplay.php?fid=28