AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
http://www.newmaple.com/forumdisplay.php?fid=28
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www.newmaple.com/video/autocad0006
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6 F# a% u" ~$ U% h1. Title block brief introduction

2. Text height
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/ v) M; m( w0 u0 ], b# f6 X$ y3. Viewport
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' q0 R, a  K/ B( B* A1 G4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad

9 ?: c! B0 H' H3 C# C" O' ~! w& Nspecial symbols
+ O* [" s! \6 a) A3 A  K* o( X%%D degree sign
5 D3 K* \* @- P$ q! f7 Q%%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
/ f( t# f% N5 wAutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
www.newmaple.com/video/autocad0007

8 \4 Y! I# |! A% QA real sample to review lecture 6

8 R1 t' U! n% a6 t4 fIntroduction Roughness
1 w3 M, q5 m( i# tQuick check hole size and position
8 H) ]. M3 n/ wIntroduction O-ring groove
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Surface roughness
•        Imperial Unit: micro-inch 10-6 inch
" {* l; Y! s# s/ ^% I; K. E9 W2 B* ~( [•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
6 P  B7 V2 c' A2 B( f4 H•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine

8 E* ~3 g1 a5 FInch size O-ring
' c& x4 N' R7 e- p2 X7 t•        O-ring number 232
  [& A9 t2 B- R) O2 |! |, q6 c; G6 h•        nominal size 2.75”x3”x1/8”
  D* y1 M: X  l( t% k; d•        Actual size 2.734”x3.012”x0.139”
•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
; Y. J  h4 w# J! w•        One of OD or ID is close standard size
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http://www.newmaple.com/forumdisplay.php?fid=28