AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
. W* j; Y9 C, p" C; r  ?% jhttp://www.newmaple.com/forumdisplay.php?fid=28
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www.newmaple.com/video/autocad0006
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1. Title block brief introduction
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5 R) W+ n5 F2 k0 ]0 [$ F; L. x2. Text height

' q7 V/ M: q, P0 l8 S$ N3 H3. Viewport

) a- i2 W2 Q% Y% ^4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad

1 }% w( @5 i/ O% d  J9 Tspecial symbols
, I- ^% ~" Y* }6 C%%D degree sign
%%P plus and minus sign
4 E9 c  Y9 o5 D6 g% }( z- I%%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
  j' a$ j" k8 U6 [- ~: Z( d" e* D3 TNew Maple AutoCAD (7)
www.newmaple.com/video/autocad0007

3 w: z/ t2 w5 |9 V4 G3 JA real sample to review lecture 6

Introduction Roughness
# T; j" e& ]$ a- `- l, uQuick check hole size and position
2 v) S2 P" y) y- T+ F% Z* T6 D% i- VIntroduction O-ring groove
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, Z' A1 i, b* w, CSurface roughness
•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine

Inch size O-ring
/ f% L, P1 X/ j) p" A•        O-ring number 232
1 w$ q& P$ ^+ {2 T$ E! U' L•        nominal size 2.75”x3”x1/8”
6 O+ a) w. B. Y•        Actual size 2.734”x3.012”x0.139”
$ `. g( _; ?. d9 B/ \•        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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http://www.newmaple.com/forumdisplay.php?fid=28