AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
0 C* y6 I. d4 d, A  ?) [http://www.newmaple.com/forumdisplay.php?fid=28

; i1 F4 W/ r6 w( Pwww.newmaple.com/video/autocad0006
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1. Title block brief introduction

' Z3 x6 |% l7 R* ^2. Text height

3. Viewport

+ q: a5 W5 I1 [: s* ]2 R) j4. Dimensions style brief introduction
/ _4 l: |; Z# N, C•        Tolerance in Mechanical / Autocad
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* l7 {5 F8 S* S6 K+ Q3 C4 L6 Hspecial symbols
%%D degree sign
%%P plus and minus sign
( b# W4 m" a: v5 V+ H8 ]%%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)
5 V* l0 R' H3 Q# Nwww.newmaple.com/video/autocad0007
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( N5 ]4 [# p! F! I) P1 }A real sample to review lecture 6

Introduction Roughness
+ n! Y; R0 r; y" F/ ~: ?Quick check hole size and position
3 J( b2 v3 m! X- sIntroduction O-ring groove
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Surface roughness
8 O/ K+ h3 w0 t( f8 ?8 Z•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
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0 l& A/ Y4 ~1 z( oInch size O-ring
+ ]$ N/ M+ V5 A3 G5 \•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
•        Actual size 2.734”x3.012”x0.139”
7 E* I# b9 l) |( K& I•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
- }! a1 |9 B$ s3 t: P•        One of OD or ID is close standard size
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