AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
/ Z: o" K+ c  c' l( ^3 c+ fhttp://www.newmaple.com/forumdisplay.php?fid=28
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www.newmaple.com/video/autocad0006

1. Title block brief introduction
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2 f6 R1 H1 ?6 [8 x/ r* g2. Text height

# n3 S5 n8 q1 {2 i) Z6 m3. Viewport

4. Dimensions style brief introduction
4 e1 y5 R! i# ^, z. I& e•        Tolerance in Mechanical / Autocad
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7 o. v+ K$ C, s4 k6 xspecial symbols
%%D degree sign
& X' l6 G/ z/ H" L! |* M6 {%%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
$ y0 m7 J. i! `New Maple AutoCAD (7)
www.newmaple.com/video/autocad0007

A real sample to review lecture 6
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Introduction Roughness
Quick check hole size and position
Introduction O-ring groove
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Surface roughness
•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
5 u" r" i9 p* V& R  y•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine

, s" Y8 S( P; X, S- _+ _Inch size O-ring
•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
•        Actual size 2.734”x3.012”x0.139”
$ r6 r# e/ m( i7 Q, w. P* s# w•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
•        One of OD or ID is close standard size

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