AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
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www.newmaple.com/video/autocad0006
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1. Title block brief introduction
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2. Text height

3. Viewport

5 u$ Z0 p* l( |9 W- k6 B4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad

' K1 q" k, z% Z; M5 J4 U) Mspecial symbols
%%D degree sign
/ U) i, O/ Z( [9 Q9 j3 J: ?! U* Y%%P plus and minus sign
& \$ w$ a: C' ~/ `: C1 K7 x%%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
8 V1 a& d8 s5 X5 NNew Maple AutoCAD (7)
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A real sample to review lecture 6

Introduction Roughness
Quick check hole size and position
( s* f5 V4 C9 s5 f7 e, \7 J3 Z% MIntroduction O-ring groove

Surface roughness
+ y+ v/ z9 x. e3 |* c  k•        Imperial Unit: micro-inch 10-6 inch
6 S& ]5 B* l+ @# d•        Metric Unit: micrometer 10-6 m
. e' U5 T$ `9 W9 M6 E/ t•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
0 u* K2 B8 h" w; H4 |! f6 S7 m•        250 micro-inch – forging surface
1 J  Y5 B; V1 K" f  j•        125 rough machine, 32 fine machine

Inch size O-ring
•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
•        Actual size 2.734”x3.012”x0.139”
! Z$ }6 o0 z. ~/ p% x4 l•        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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