AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
http://www.newmaple.com/forumdisplay.php?fid=28
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www.newmaple.com/video/autocad0006
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1. Title block brief introduction
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2. Text height

% c3 E! m: L3 |* M' L3. Viewport
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4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad
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special symbols
%%D degree sign
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%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
, y( q; @7 q3 T4 c5 w4 j2 LAutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
www.newmaple.com/video/autocad0007

6 M+ a" i4 m2 z0 FA real sample to review lecture 6

, t' p4 Z. p" W1 wIntroduction Roughness
/ j9 j, F# v+ x; A3 FQuick check hole size and position
- {3 Q5 z! V' Z" Z$ k6 ~# R* Z0 m5 Q% gIntroduction O-ring groove

Surface roughness
•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
# s  Z/ q+ N, Z2 K0 a: S, D•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
) U* w) n$ f$ M! H6 V2 z3 |/ U8 ?•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
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7 ]9 X% m; Z, lInch size O-ring
•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
+ {4 ?7 X) c: l4 |1 y•        Actual size 2.734”x3.012”x0.139”
- U% m3 `! W8 {* `+ Z! h$ e. {•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
•        One of OD or ID is close standard size

1 a. c* a8 d  F0 _! x+ M+ Jhttp://www.newmaple.com/forumdisplay.php?fid=28