AutoCAD 实战讲座

DaShan

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

: I7 _0 Y& M! \. Vwww.newmaple.com/video/autocad0006
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* d7 A: y6 t, @- i1 o1. Title block brief introduction
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2. Text height
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3. Viewport

0 C( W/ S+ m) w4. Dimensions style brief introduction
) C: |) A' Q5 M! W•        Tolerance in Mechanical / Autocad

2 \% _) ]- z3 N- @special symbols
%%D degree sign
%%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
' V% Y7 T  ^" d! N* {: h* l9 X7 bAutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
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7 R( \4 ]8 J, w; ]. J( M9 ]9 X% BA 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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, B2 ?6 F( v6 k6 iSurface roughness
1 ^4 F9 S; r  t2 s- q) b3 F•        Imperial Unit: micro-inch 10-6 inch
1 l; @! D7 x) T( `4 D•        Metric Unit: micrometer 10-6 m
$ `  j  m5 e/ L8 y•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
•        250 micro-inch – forging surface
' c% Y4 x8 Z" V5 F. ^1 c•        125 rough machine, 32 fine machine
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Inch size O-ring
0 R. C, h& Z+ B: a•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
•        Actual size 2.734”x3.012”x0.139”
3 Q1 R5 Y0 b) P' u•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
•        One of OD or ID is close standard size

+ h/ ^3 U2 W2 h# D0 lhttp://www.newmaple.com/forumdisplay.php?fid=28