AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
http://www.newmaple.com/forumdisplay.php?fid=28

www.newmaple.com/video/autocad0006
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1. Title block brief introduction
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& ^+ w# t' q8 t' A/ s2 ?  c/ q2. Text height
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& c9 d5 @5 o% ?( y/ e6 x3. Viewport

4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad
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special symbols
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%%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
- C( G- z( g; e0 y3 AAutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
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: r( O5 P1 i" p$ O' b& c% |A real sample to review lecture 6
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8 V- A1 m0 {5 wIntroduction Roughness
Quick check hole size and position
' t+ N' g1 r' x% i5 y, G: vIntroduction O-ring groove
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3 C9 j* z3 O8 F0 A& ^# dSurface roughness
% S2 H& k8 }$ F) h! w9 z  h•        Imperial Unit: micro-inch 10-6 inch
% d$ u) i& ^" l7 }( I, J•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
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•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
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Inch size O-ring
& m; |9 s* T% N8 V* j1 Y•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
, ~2 x5 M8 D  q1 ~  q/ ~( R$ g•        Actual size 2.734”x3.012”x0.139”
2 N. W6 F" n1 M& P$ D•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
& F6 R% }; T/ {( b9 A/ V2 ]4 W•        One of OD or ID is close standard size

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