AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
3 W$ w  h- ?: X) h9 Y' mhttp://www.newmaple.com/forumdisplay.php?fid=28

www.newmaple.com/video/autocad0006

, }3 `! k& p& I0 Y1. Title block brief introduction
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2. Text height
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3. Viewport
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- X0 c0 p; W4 D0 t0 |, r4 a' }4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad

special symbols
%%D degree sign
%%P plus and minus sign
2 F1 ~, a2 M: \: u%%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)
www.newmaple.com/video/autocad0007
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1 `( B8 G% U' F7 H$ E" Q( ~A real sample to review lecture 6

. A( q: |* O' ^7 A) [; J: NIntroduction Roughness
Quick check hole size and position
Introduction O-ring groove
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$ @. h/ _+ m. N. u' ]Surface roughness
( p0 V1 d4 U7 f) p0 _: C+ [# s•        Imperial Unit: micro-inch 10-6 inch
: X9 ]4 g" w. K; b6 I0 t6 \6 [•        Metric Unit: micrometer 10-6 m
1 Q, z( I: P- k1 W  v7 K4 v•        Sample 250 micro-inch = 6.3 micrometer
: P0 F) P8 [0 z2 N$ i(250X25.4X10-3)
•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
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Inch size O-ring
•        O-ring number 232
3 r  ]% f& v  [6 b•        nominal size 2.75”x3”x1/8”
, b4 z" g. N1 W1 {5 g•        Actual size 2.734”x3.012”x0.139”
•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
- g% L  W, [  c) Q% f/ ?% O•        One of OD or ID is close standard size
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http://www.newmaple.com/forumdisplay.php?fid=28