AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
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www.newmaple.com/video/autocad0006

' K) w0 z  P- E. A* i% {1. Title block brief introduction

2. Text height
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+ q5 ^, V( Z; _0 s$ A0 i3. Viewport

( h  n6 Y6 w0 P- X9 y* U0 I" Q4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad
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8 ?, s6 [  A) {# M4 I) `3 nspecial symbols
%%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
. @) [3 I1 f7 D2 ]; nNew Maple AutoCAD (7)
www.newmaple.com/video/autocad0007
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A real sample to review lecture 6

Introduction Roughness
7 ]3 J8 t) k' r  @* n& t4 v: ZQuick check hole size and position
Introduction O-ring groove
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Surface roughness
5 s1 z0 W+ S' t5 ~( m•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
1 m$ d. S5 \/ i; c+ U2 N•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
/ o0 n- x2 g2 c! N9 {) k8 ?•        250 micro-inch – forging surface
$ q; t- k, _9 ^: w•        125 rough machine, 32 fine machine

Inch size O-ring
4 z1 ^: S* K8 i7 E( n•        O-ring number 232
1 y! K. \! _* D, L8 k) |. w•        nominal size 2.75”x3”x1/8”
1 F$ Z, [. |, v3 J7 l. n* j•        Actual size 2.734”x3.012”x0.139”
4 }. m/ T2 i4 L3 O' S8 y: O•        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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# t; E' I2 |  e& H1 l* Nhttp://www.newmaple.com/forumdisplay.php?fid=28