AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
9 K7 S2 U+ W& h+ s% E2 ~$ l- Xhttp://www.newmaple.com/forumdisplay.php?fid=28

4 v, e% y/ F$ F* a6 Hwww.newmaple.com/video/autocad0006
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1 f+ g1 u- z; i- A1. Title block brief introduction

2. Text height
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3. Viewport
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4. Dimensions style brief introduction
+ y+ V( K0 E5 X0 }5 S  D•        Tolerance in Mechanical / Autocad

. V( ^" [. L9 e) I& Rspecial symbols
0 ^2 Z; R2 l+ o, Z%%D degree sign
%%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
' _) ~& N% K- a4 U8 R3 PAutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
- N3 [% S) R/ P$ Hwww.newmaple.com/video/autocad0007

2 S* t' q' O2 t. J6 ~A real sample to review lecture 6

% P' `  ^  J# m% _- P+ JIntroduction Roughness
Quick check hole size and position
Introduction O-ring groove

Surface roughness
•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
! y7 _5 D* q. F! W8 A' `(250X25.4X10-3)
6 {) g3 T' w5 n0 W' h- K0 ]  Q•        250 micro-inch – forging surface
9 a+ a* |& V- |3 p8 G8 R7 s•        125 rough machine, 32 fine machine
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8 L0 }9 `/ [  W% @/ D+ hInch size O-ring
•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
. w0 u  V; Y8 O' `6 G7 }4 `; \•        Actual size 2.734”x3.012”x0.139”
) G7 V6 D; O* \5 j•        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