AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
8 Q# A% {; ?- {http://www.newmaple.com/forumdisplay.php?fid=28
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1 D2 p: B4 ?0 M: i8 ewww.newmaple.com/video/autocad0006
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( a; d$ n' D6 r2 d8 [1. Title block brief introduction
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2. Text height
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3. Viewport
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4. Dimensions style brief introduction
. w2 l( t& a* p. g$ E* g•        Tolerance in Mechanical / Autocad

3 J# J" z$ D1 @% w+ l8 especial symbols
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%%P plus and minus sign
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恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
# T) U0 @+ q, n- f4 wAutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
www.newmaple.com/video/autocad0007

" U' ~2 M8 h" l* WA real sample to review lecture 6
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Introduction Roughness
! @: R  ]' g" A- w$ `: C8 }: U* dQuick check hole size and position
0 l' L9 i% C9 m  e" c+ E" P+ n" cIntroduction O-ring groove

Surface roughness
! [) G$ `3 x+ t0 v8 E+ x. q•        Imperial Unit: micro-inch 10-6 inch
6 {5 X* }( w. o( X- v& R•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
/ I! {: _" r. y) @! m  S, d8 h' ^& w(250X25.4X10-3)
7 Q& ^1 F+ W) ~* D9 u, L•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
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Inch size O-ring
2 s4 {5 {( S3 B+ G•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
% ~  ^# X& r) V: Y6 u5 r% C1 P0 `& x•        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

( ]1 h; i* q$ ?7 Ohttp://www.newmaple.com/forumdisplay.php?fid=28