AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
8 J8 M" b$ ]( Z+ M' k5 Vhttp://www.newmaple.com/forumdisplay.php?fid=28
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' r5 `( t) B8 o. O) x% nwww.newmaple.com/video/autocad0006
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1. Title block brief introduction

' ?* j' @/ M4 K* P2. Text height

3. Viewport

4. Dimensions style brief introduction
. _; U- J% C) S: u5 z/ i1 J•        Tolerance in Mechanical / Autocad
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special symbols
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%%P plus and minus sign
$ `5 k+ ]. x, w  |%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
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www.newmaple.com/video/autocad0007

A real sample to review lecture 6

Introduction Roughness
$ z/ s8 M9 p! DQuick check hole size and position
! Q7 o" |" T& oIntroduction O-ring groove
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# c. u0 S& g+ I& e' \4 J7 Q1 L2 R- ASurface roughness
•        Imperial Unit: micro-inch 10-6 inch
: }" ?6 k" O* x9 I' r( _: u+ p9 g•        Metric Unit: micrometer 10-6 m
- z, U4 T8 F# d# O; J- \, P. L5 s# u•        Sample 250 micro-inch = 6.3 micrometer
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$ s8 C" U7 ~: f9 O3 m; M% p7 M1 ?+ y•        250 micro-inch – forging surface
# k/ o: k/ B; P3 P•        125 rough machine, 32 fine machine
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$ _! P5 p4 H3 _$ p6 c# G) QInch size O-ring
•        O-ring number 232
! a! h, h7 Z6 L- [•        nominal size 2.75”x3”x1/8”
" `% [' @+ m4 K# {, d. Z! X  `•        Actual size 2.734”x3.012”x0.139”
& e" S3 C5 E5 K0 @* t, G: _3 k•        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