AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
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( m7 J) m3 W5 U/ ?3 @www.newmaple.com/video/autocad0006

- o9 z  p8 K" P$ ^! X8 c1. Title block brief introduction

2. Text height

3. Viewport
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0 M$ u, p; d5 @5 w4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad
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5 @0 R! ~5 K+ ^& \3 g( D; @- Dspecial symbols
%%D degree sign
%%P plus and minus sign
4 N; p; V- `: u) v8 B%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
; `' V: L9 e1 L* qAutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
www.newmaple.com/video/autocad0007
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A real sample to review lecture 6

; T/ N5 k7 z8 |# I, ?) L6 XIntroduction Roughness
Quick check hole size and position
Introduction O-ring groove
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8 c' M* ]: i6 l) H! ?Surface roughness
" H. G0 {& U1 {' t3 M; S. A0 j•        Imperial Unit: micro-inch 10-6 inch
& e% F: H5 z7 |•        Metric Unit: micrometer 10-6 m
$ }) d$ f# x& y•        Sample 250 micro-inch = 6.3 micrometer
+ {" x8 c  a; v! t. j3 z/ C(250X25.4X10-3)
$ z/ `4 ]- y/ F$ x•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
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$ B9 x4 N& C( d6 u- jInch size O-ring
( S  e6 Z/ ?/ e8 o  g0 l•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
& Q& P, ~9 [$ V/ Q•        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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) C* n9 F1 B4 Phttp://www.newmaple.com/forumdisplay.php?fid=28