AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
9 o/ v$ n$ [( d9 ~8 A2 [  q- Ghttp://www.newmaple.com/forumdisplay.php?fid=28

* L$ @/ u- {! t- ?! qwww.newmaple.com/video/autocad0006

1. Title block brief introduction

3 R6 [) G% ]/ J2. Text height

3. Viewport

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

. f" \  K' D4 J0 k1 D, j& \special symbols
+ P# l4 E1 |: K%%D degree sign
" U% \1 M+ l9 z( E; v# q  f8 s+ {4 H%%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)
+ N8 L) i; o% T( z- mwww.newmaple.com/video/autocad0007
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0 l. Y7 [' ^! `A real sample to review lecture 6
5 I1 n( t/ J% }- e% G6 h+ J4 m
( `: \* F- y* Q6 S' AIntroduction Roughness
) m, T2 k# K- _# W1 E  ~2 FQuick check hole size and position
Introduction O-ring groove

0 _) p0 n: U: p$ kSurface roughness
•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
) z& X- k; m) B•        Sample 250 micro-inch = 6.3 micrometer
* C8 {9 [  S. Z2 C" f: V(250X25.4X10-3)
$ Q. w) h; ?  D7 W•        250 micro-inch – forging surface
  Z" m; i5 b: {* y•        125 rough machine, 32 fine machine
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( A2 I2 R& I" @, o2 HInch size O-ring
•        O-ring number 232
' T' S7 [! |4 k) E•        nominal size 2.75”x3”x1/8”
•        Actual size 2.734”x3.012”x0.139”
•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
•        One of OD or ID is close standard size

7 e: X$ V8 C7 {http://www.newmaple.com/forumdisplay.php?fid=28