AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
http://www.newmaple.com/forumdisplay.php?fid=28
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4 B/ _; b; _! ?: t* N  Pwww.newmaple.com/video/autocad0006
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: `7 J& D( C* Q1. Title block brief introduction
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1 L: o9 B; E- h! V2. Text height
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3 i0 _7 ?5 j. M" C* a3. Viewport

  O& o' i9 [% k4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad
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6 ~( x: w- B, Cspecial symbols
%%D degree sign
%%P plus and minus sign
5 T& W# H1 i% X0 F: W/ t8 [+ K1 p: z%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
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New Maple AutoCAD (7)
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A real sample to review lecture 6
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Introduction Roughness
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Introduction O-ring groove
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Surface roughness
6 Y0 G0 X5 s/ B3 Z' A5 g•        Imperial Unit: micro-inch 10-6 inch
) M, w: b' w8 e' f/ A( F0 b& l# }•        Metric Unit: micrometer 10-6 m
, T0 E2 y; ]" {5 z! R9 H" J•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
6 R! a  E" T' w' w. O& s1 m' Q•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
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$ H0 ]2 E* t& e! w, A- uInch size O-ring
$ E4 k1 U& s& I) H+ x; ?•        O-ring number 232
•        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

http://www.newmaple.com/forumdisplay.php?fid=28