AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
; I- Z  W% j( e- g/ B& N1 Ihttp://www.newmaple.com/forumdisplay.php?fid=28

+ b' e0 w' Y  O7 @+ mwww.newmaple.com/video/autocad0006

* p% l+ y3 u0 W1. Title block brief introduction
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2. Text height

3. Viewport
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4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad
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2 {2 h9 g, C. }special symbols
2 I1 V8 s$ I7 }& u" U%%D degree sign
% I# H! M: s& M7 P2 h%%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
AutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
www.newmaple.com/video/autocad0007
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& Q6 I8 @' B' }, p% ]' F4 J. AA real sample to review lecture 6

1 |8 m, Z( ~2 Z8 X! LIntroduction Roughness
Quick check hole size and position
7 A: k8 ?6 s+ u1 Y% z. b: nIntroduction O-ring groove
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Surface roughness
6 R8 Y, _. }. H: C. Q  J" n( c•        Imperial Unit: micro-inch 10-6 inch
9 \; q$ E1 {! i& L! j•        Metric Unit: micrometer 10-6 m
4 N; H9 O1 q% s5 q0 N+ w! \. O•        Sample 250 micro-inch = 6.3 micrometer
5 s' H9 U$ p9 E/ d" O(250X25.4X10-3)
•        250 micro-inch – forging surface
, k6 V3 F) E5 B" e3 ^% G+ f1 I•        125 rough machine, 32 fine machine

( R3 E$ N# X# _, [  G* F2 T& hInch size O-ring
! |- }; l' c! F# j•        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
$ C0 l. F; k# e! {% q•        One of OD or ID is close standard size
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! V1 T- x* {. p% L$ B, Uhttp://www.newmaple.com/forumdisplay.php?fid=28