AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
http://www.newmaple.com/forumdisplay.php?fid=28
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. u& h. j2 L, o. owww.newmaple.com/video/autocad0006
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1. Title block brief introduction

2. Text height

3. Viewport
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4. Dimensions style brief introduction
3 x. T) v  _. S* ~; |•        Tolerance in Mechanical / Autocad
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# U  s4 f5 h+ N3 k8 M' @) C5 ispecial symbols
%%D degree sign
%%P plus and minus sign
%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
3 c& y3 H% Y3 z5 f) aAutoCAD 实战讲座第七讲
3 D; n0 ^, C/ P1 ~- YNew Maple AutoCAD (7)
www.newmaple.com/video/autocad0007
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A real sample to review lecture 6

& _% ^; A/ b+ g1 W* W! P! I! h& QIntroduction Roughness
Quick check hole size and position
4 [( R) J0 o. }; O4 P; q7 b. kIntroduction O-ring groove
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5 z/ ?& |- ]; A; _( _: B; ^Surface roughness
5 v9 @0 t5 M2 }* M& x, {: `) k•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
: z7 G- E" b! [. `% ]+ ~+ w9 P$ @0 P•        Sample 250 micro-inch = 6.3 micrometer
9 o2 z. Q  `1 X(250X25.4X10-3)
, O8 t  @( B$ {$ {2 V2 B% w" T. S•        250 micro-inch – forging surface
! m. ]$ F. u/ ?•        125 rough machine, 32 fine machine
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2 L5 v) |9 j+ x2 KInch size O-ring
# W. B8 D* g/ C: A' R•        O-ring number 232
, ?! P9 ]6 V+ r/ S•        nominal size 2.75”x3”x1/8”
5 A; s9 a% v* P9 [6 s4 M! i, {•        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

- ~. T% M% x+ _7 z. A3 s# ?  Ohttp://www.newmaple.com/forumdisplay.php?fid=28