AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
http://www.newmaple.com/forumdisplay.php?fid=28

www.newmaple.com/video/autocad0006

5 k+ T0 s5 g, W6 |0 q; h1. Title block brief introduction
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2. Text height
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; d' {9 c% c: ?+ ?( P( [3. Viewport
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! ~) Q+ f$ q- c, t4. Dimensions style brief introduction
( m) r2 @! ]% ], F5 h) Z  k& n•        Tolerance in Mechanical / Autocad

: |1 i4 G# L0 j/ Kspecial symbols
%%D degree sign
( X) v  [. W/ f) u" ?+ e4 P, M%%P plus and minus sign
6 y! f7 o) ]/ n2 g4 l%%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
" o$ t' M, f2 w, mNew Maple AutoCAD (7)
7 N9 o; `# E" Y0 D0 `- E9 Iwww.newmaple.com/video/autocad0007
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) L" t: E5 O* P/ f6 ]+ `A real sample to review lecture 6

- r) O8 O$ k9 Z! Y/ SIntroduction Roughness
Quick check hole size and position
Introduction O-ring groove
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# I" i; F6 W2 B* G4 P% Q( }Surface roughness
' w; k  A! ^$ I; \' I•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
4 u4 h+ d! _1 J* B! G( a  y- K•        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
•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
) K& ?" t# |& O9 |•        Actual size 2.734”x3.012”x0.139”
•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
' U8 i  f$ S$ ~' @) B! o2 i•        One of OD or ID is close standard size
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http://www.newmaple.com/forumdisplay.php?fid=28