AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
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www.newmaple.com/video/autocad0006

2 a7 C. S1 q# A$ l" E9 A9 s; [/ E6 I1. Title block brief introduction
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- M, k' i+ b0 V% d2. Text height
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9 H) G0 |: V) P6 N/ W3. Viewport
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4. Dimensions style brief introduction
5 h4 @( |# n+ o9 w" T6 _( q•        Tolerance in Mechanical / Autocad

! i5 t6 i. R8 b) s2 Z: hspecial symbols
%%D degree sign
%%P plus and minus sign
2 {* c" L- O. \%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
( f2 J9 D9 {" s) S3 [  p; pAutoCAD 实战讲座第七讲
4 F) Z. d6 V' TNew Maple AutoCAD (7)
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A real sample to review lecture 6

Introduction Roughness
$ L* G6 E3 g8 X0 ?4 j5 dQuick check hole size and position
Introduction O-ring groove
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Surface roughness
•        Imperial Unit: micro-inch 10-6 inch
" ~4 a& s6 a' ?3 C& K3 z•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
! B# v$ f" Q$ T! j•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
8 m. x4 K" j) A+ X8 E+ A
) j# A0 I4 @& B/ h( ?Inch size O-ring
5 `" G$ [* n- d! ]•        O-ring number 232
9 _/ r8 ~, b0 I! F& f2 s2 M•        nominal size 2.75”x3”x1/8”
! w" Z* k1 R" r1 B•        Actual size 2.734”x3.012”x0.139”
•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
6 `3 P" v0 V. q% ~( T•        One of OD or ID is close standard size

, C1 F* _# k- L3 @1 |: X  b, L- ihttp://www.newmaple.com/forumdisplay.php?fid=28