AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
http://www.newmaple.com/forumdisplay.php?fid=28
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* M7 R4 p: j9 W: Zwww.newmaple.com/video/autocad0006
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1. Title block brief introduction

6 H  C& u3 K, f8 D$ ?2. Text height

' {7 E, K* d2 n8 C3. Viewport
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4. Dimensions style brief introduction
  u5 q+ M* g. J4 y/ p1 f& w1 g•        Tolerance in Mechanical / Autocad

special symbols
  t: e$ v5 u  n( x4 }  X%%D degree sign
%%P plus and minus sign
& ~. m# F7 m4 r2 x4 G%%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
7 {& G$ o% z( r9 DNew Maple AutoCAD (7)
www.newmaple.com/video/autocad0007
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A real sample to review lecture 6
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( r6 L% V5 S: Q: t: KIntroduction Roughness
Quick check hole size and position
Introduction O-ring groove

Surface roughness
# |% C" A0 g# Z•        Imperial Unit: micro-inch 10-6 inch
, _( s& b& `! D•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
•        250 micro-inch – forging surface
# q  }$ q& M% f$ f. C0 Y•        125 rough machine, 32 fine machine
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# p2 p6 S4 S; W* X* A& g) H3 \Inch 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
3 f# t: K3 J- m0 k. ?3 e) l6 B•        One of OD or ID is close standard size
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+ ]1 q0 D8 j# w% g$ e) mhttp://www.newmaple.com/forumdisplay.php?fid=28