AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
http://www.newmaple.com/forumdisplay.php?fid=28
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www.newmaple.com/video/autocad0006
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1. Title block brief introduction
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2. Text height

+ E/ r0 k' Z) M" ^3. Viewport

4. Dimensions style brief introduction
) j7 ~2 U& v* t' ^& l•        Tolerance in Mechanical / Autocad
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special 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
AutoCAD 实战讲座第七讲
+ ^; Z$ p+ d4 q5 E. n" o1 {New Maple AutoCAD (7)
www.newmaple.com/video/autocad0007
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+ Y" s8 N8 D& _, D$ pA real sample to review lecture 6
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# C% o  T$ V! m: NIntroduction Roughness
Quick check hole size and position
Introduction O-ring groove
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9 q; C& U4 f" B7 U" D& _1 i$ KSurface roughness
•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
# H& o! Q7 P* E8 J' P& G•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
•        250 micro-inch – forging surface
; ~4 T" f2 p9 H. B3 _( `•        125 rough machine, 32 fine machine

Inch size O-ring
4 V! O3 T. r3 O# p0 M•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
•        Actual size 2.734”x3.012”x0.139”
4 D+ l% [" F8 d" w) m•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
+ X, Y7 C- U" {* b7 c& g1 j•        One of OD or ID is close standard size

9 g& ]4 Z3 g/ y$ a' Phttp://www.newmaple.com/forumdisplay.php?fid=28