AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
+ o3 V; [, H* X+ p' xhttp://www.newmaple.com/forumdisplay.php?fid=28

. L7 N. a& E( x0 rwww.newmaple.com/video/autocad0006
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, x$ b1 u/ f' w# D( m9 g1. Title block brief introduction

6 I) D. Q2 D9 f5 Y, L1 R2. Text height

9 g4 q% A- {% ^3. Viewport

4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad
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! I6 G7 W, F) I  nspecial symbols
7 V: E9 M4 t4 J7 V. R: o% n%%D degree sign
%%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)
" q. m5 ?$ I2 G% r+ f  o! Kwww.newmaple.com/video/autocad0007
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A real sample to review lecture 6

* s5 f' ^2 ~3 T0 H/ w' qIntroduction Roughness
. ^$ h' ~& ]$ G- C  D6 gQuick check hole size and position
8 F8 z* Z7 {1 @; |! c2 z- @/ }Introduction O-ring groove

2 j$ c. ~" T, Q0 ESurface roughness
•        Imperial Unit: micro-inch 10-6 inch
/ d# [0 m) w  G' k( Q2 q•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
/ V" x0 C) }% B" \: B# ~5 J4 x" X& K(250X25.4X10-3)
•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine

Inch size O-ring
•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
•        Actual size 2.734”x3.012”x0.139”
# t4 r( C* C- \•        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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