AutoCAD 实战讲座

DaShan

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

: ?4 G/ n0 U$ U# j$ jwww.newmaple.com/video/autocad0006

1. Title block brief introduction
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2. Text height
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3. Viewport

( t  \6 S5 t6 G/ s% b5 C7 x+ S4. Dimensions style brief introduction
9 A2 [! h6 a8 |& Z; s•        Tolerance in Mechanical / Autocad
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1 h! W& s. ^1 K, v, u* S; ospecial symbols
%%D degree sign
2 z! T& ?/ Z5 t+ C! H* O% k# u%%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
4 Z' K, _* T7 c3 R/ t" nAutoCAD 实战讲座第七讲
! Q/ Z) Y" N* @4 c$ wNew Maple AutoCAD (7)
; G2 j& R. D' L$ P5 [- M" Fwww.newmaple.com/video/autocad0007
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A real sample to review lecture 6
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7 P1 C( n) }4 v. l4 \- Y$ ?* a* fIntroduction Roughness
Quick check hole size and position
) b- o6 i$ S7 X  R: P% wIntroduction O-ring groove

Surface roughness
) r& R: [  Y4 X2 k1 }•        Imperial Unit: micro-inch 10-6 inch
4 m6 E2 n) z8 ~+ k) n1 k; \1 t•        Metric Unit: micrometer 10-6 m
5 c+ S4 O* X" Q•        Sample 250 micro-inch = 6.3 micrometer
; T1 \. p6 q# B3 o8 y(250X25.4X10-3)
; n+ r" q3 g* t* I! D, @9 P•        250 micro-inch – forging surface
4 n/ ]8 G5 v: j7 z3 [6 [•        125 rough machine, 32 fine machine
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; g4 u5 |7 K) c3 e+ t$ aInch size O-ring
•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
•        Actual size 2.734”x3.012”x0.139”
2 _" h$ `- @" w6 h•        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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! k0 R% _' F0 M8 j& N7 Thttp://www.newmaple.com/forumdisplay.php?fid=28