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

' e$ ^& l6 i9 @0 K% Y4 @" W1. Title block brief introduction
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2. Text height

3. Viewport
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6 z( [, H$ X; o" u4. Dimensions style brief introduction
0 X% H* A9 I) A/ _% @9 ?, [•        Tolerance in Mechanical / Autocad
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3 x9 j( s+ f! Q; p4 W6 u, A' a3 ]special symbols
%%D degree sign
& ?6 ?6 d% M! T8 W; x" B" l. Z' b%%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
  g7 w2 Y" f4 R0 m/ `) pAutoCAD 实战讲座第七讲
8 K4 H% e; T' g0 e/ ~New Maple AutoCAD (7)
$ a# K+ h4 V. y) y# y: B. S6 Xwww.newmaple.com/video/autocad0007
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. E* K  m6 |# {3 nA real sample to review lecture 6

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

Surface roughness
$ A; y# U7 @; O5 u+ n•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
( _$ X  |( v, R/ Z# L7 U, w•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
4 j7 y! w$ w$ B•        250 micro-inch – forging surface
. \- d. y! d: m1 ]# d•        125 rough machine, 32 fine machine
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Inch size O-ring
% b+ l9 S' x( U1 D•        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
4 e7 d* R0 C9 ~" Z& K# a' E•        One of OD or ID is close standard size

http://www.newmaple.com/forumdisplay.php?fid=28