AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
( U# y9 N' I- ?/ W, ^5 V& J, Bhttp://www.newmaple.com/forumdisplay.php?fid=28

( V# \7 ]5 [0 ^) Q: wwww.newmaple.com/video/autocad0006

, w! K& I$ U2 U5 h1. Title block brief introduction
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: b, E6 y$ V8 A  I6 o; b8 d2. Text height

; S# A& N1 g/ [* ~3. Viewport

% l# G* H: U- i* s" C8 F4. Dimensions style brief introduction
! [7 D4 V7 C5 S; Z/ f•        Tolerance in Mechanical / Autocad
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& v" G! G+ g- nspecial symbols
%%D degree sign
: K8 ]# K: e3 C7 L: m%%P plus and minus sign
2 E9 a# Q: |) F7 n2 Z- \%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
  g* m, E- C6 H) `$ f6 Q3 }5 CAutoCAD 实战讲座第七讲
. \2 r) ?, b4 e, \" WNew Maple AutoCAD (7)
www.newmaple.com/video/autocad0007

A real sample to review lecture 6
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Introduction Roughness
Quick check hole size and position
Introduction O-ring groove

, J0 Y* w4 u7 qSurface roughness
1 w! Z( G8 m8 A  V3 U# F) ~6 q•        Imperial Unit: micro-inch 10-6 inch
# l7 s' V: n/ J, b•        Metric Unit: micrometer 10-6 m
) l; p+ L" F: q" d$ n0 U4 |& h•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
•        250 micro-inch – forging surface
) Y& t" h/ E7 T•        125 rough machine, 32 fine machine
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. b2 E$ N) v, Z4 z! c% jInch size O-ring
•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
•        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