AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
http://www.newmaple.com/forumdisplay.php?fid=28
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: _/ Z4 D. `+ W' n: \) }  Vwww.newmaple.com/video/autocad0006
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1. Title block brief introduction

2. Text height

3. Viewport

7 `1 b4 x- `0 q/ L5 f. J7 r4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad

1 T8 ]- x) J- H! u4 q9 Z, Mspecial symbols
%%D degree sign
9 [- a! Z/ E+ N: O%%P plus and minus sign
& q* ^* ]6 D0 Q% v+ o0 t6 S%%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
8 H  d* G: \: m6 L6 LNew Maple AutoCAD (7)
8 r' q+ p6 K7 B0 A" h6 H, \www.newmaple.com/video/autocad0007

3 D  ~; X+ d5 b" `% @& W  mA real sample to review lecture 6

$ y; |! T/ _( k5 h- i5 VIntroduction Roughness
Quick check hole size and position
Introduction O-ring groove

/ ~2 [/ D6 M1 J* C( cSurface roughness
. D, q( ~9 b# Q- q9 |•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
" I, F0 i. {4 _9 {" C& ]2 y& }•        250 micro-inch – forging surface
/ K0 d$ C3 U# t* X0 \•        125 rough machine, 32 fine machine
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+ Z1 r+ N6 O, D" J9 W* ?Inch size O-ring
% g# Z" Z: G' O•        O-ring number 232
3 Q$ R" X& Q+ u: ?! Z$ Q* W1 h•        nominal size 2.75”x3”x1/8”
) G  V  h' N* z5 R6 R; n- r3 Y•        Actual size 2.734”x3.012”x0.139”
•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
4 u) [" z; G1 O* p9 F/ t3 R6 g•        One of OD or ID is close standard size
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http://www.newmaple.com/forumdisplay.php?fid=28