AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
: |' C4 M; U) u( W' k( \! f$ [http://www.newmaple.com/forumdisplay.php?fid=28
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3 f7 l* a2 I5 t" x& b8 }) l- Hwww.newmaple.com/video/autocad0006
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1. Title block brief introduction
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2. Text height

2 L3 h/ J6 k- N+ `! L# A( I3. Viewport

4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad
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& i5 w0 t5 m6 ~, `4 hspecial symbols
" H  W3 y; Q9 O% @%%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
+ x, _' \( v7 G. qAutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
: S$ f& o7 c7 u% D, Bwww.newmaple.com/video/autocad0007

" ^8 O% }3 ?6 R6 R. R4 a" A5 U  V" ?A real sample to review lecture 6
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Introduction Roughness
& @! e1 x$ q, B2 L" l- d$ eQuick check hole size and position
Introduction O-ring groove
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Surface roughness
•        Imperial Unit: micro-inch 10-6 inch
- y2 g) d5 _6 @) W: k; f; v•        Metric Unit: micrometer 10-6 m
% ^* Q2 q7 ]) q6 }; Y* `+ q7 V9 R•        Sample 250 micro-inch = 6.3 micrometer
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( ~- g8 ~$ ?) K1 d8 q•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine

% U" P. A, s& i3 y% O( A: a8 KInch size O-ring
•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
* S, }8 U- m4 l  K' A$ R/ B•        Actual size 2.734”x3.012”x0.139”
0 Q: O( q# m) W+ a% |•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
•        One of OD or ID is close standard size

http://www.newmaple.com/forumdisplay.php?fid=28