AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
http://www.newmaple.com/forumdisplay.php?fid=28
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+ |% S& K8 K& p# c9 M0 y9 }+ Rwww.newmaple.com/video/autocad0006

1. Title block brief introduction

9 i/ c* g5 c& Y% C2. Text height
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0 a! Z8 ]7 R" q* e  Y7 r' x. V3. Viewport
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1 y3 H; n( v0 {( v8 U4. Dimensions style brief introduction
9 I9 h( P( k6 @1 Y" E•        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
. h# q8 D4 Q7 ?+ z# wAutoCAD 实战讲座第七讲
+ q# \5 z' @+ m- y$ s5 ?1 aNew Maple AutoCAD (7)
( k4 I3 _6 t* K1 ~www.newmaple.com/video/autocad0007
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A real sample to review lecture 6

Introduction Roughness
Quick check hole size and position
Introduction O-ring groove

Surface roughness
4 l) j% }% v; L. ^8 X& f•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
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4 Q" B/ G5 ^/ K9 R9 y" w•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
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Inch size O-ring
•        O-ring number 232
& U8 Q/ O6 S7 A* X. ~0 z& E* `•        nominal size 2.75”x3”x1/8”
3 X. e; A; h8 p1 Q•        Actual size 2.734”x3.012”x0.139”
9 [. C: ]+ A, c& Y- U•        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