AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
( I) S# q5 ~  {7 x) ^* p6 G6 p& Bhttp://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

: B2 {/ r, ], p9 Y( B5 V- e2. Text height

3. Viewport
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4. Dimensions style brief introduction
: x+ Q# F0 F- \; p•        Tolerance in Mechanical / Autocad
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1 |. R* s7 K1 `1 w. ~, o! ~special symbols
5 b( p. Z6 ~$ p  t" V1 R/ A$ i%%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
AutoCAD 实战讲座第七讲
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8 x3 U5 c* ~$ qwww.newmaple.com/video/autocad0007

A real sample to review lecture 6

Introduction Roughness
Quick check hole size and position
" E( D. \, i+ s8 h$ @Introduction O-ring groove
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Surface roughness
& }1 `3 U+ X- t6 f* j•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
( |5 Q1 |  O$ ~(250X25.4X10-3)
: `) w) K: U$ @% J& y  B8 v! ~•        250 micro-inch – forging surface
" n- `3 z1 ?9 t9 J•        125 rough machine, 32 fine machine
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Inch size O-ring
. J5 f8 {2 b- a# ^  ?% Y% a' U•        O-ring number 232
1 w' J$ T3 h$ s( j•        nominal size 2.75”x3”x1/8”
2 j$ B% C8 ^- y4 S•        Actual size 2.734”x3.012”x0.139”
•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
•        One of OD or ID is close standard size
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http://www.newmaple.com/forumdisplay.php?fid=28