AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
7 P& J. K. u) ghttp://www.newmaple.com/forumdisplay.php?fid=28

; i7 P: o. g" ?. \www.newmaple.com/video/autocad0006
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( M% |9 m5 T& r( Y5 r6 w# ~1. Title block brief introduction
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7 C0 N9 c& k( @5 Z$ P+ V2. Text height

3. Viewport

. T) h# u' C  {# \$ y4. Dimensions style brief introduction
8 U5 j* k4 t" |) z•        Tolerance in Mechanical / Autocad

special symbols
0 q! _9 x8 A6 @, b: R+ g6 h4 D%%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
; e  T. t" J9 z, N4 `8 eAutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
/ W, M, N6 g6 B1 j1 swww.newmaple.com/video/autocad0007

/ h& Q8 u1 P( PA real sample to review lecture 6

Introduction Roughness
Quick check hole size and position
8 C7 j; z3 I- lIntroduction O-ring groove
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8 A) l4 h* r( _/ f7 d" OSurface roughness
•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
, P0 n1 T" c( t- P/ ?•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
•        250 micro-inch – forging surface
8 N6 T" T2 `: i- k1 B•        125 rough machine, 32 fine machine
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Inch size O-ring
•        O-ring number 232
0 V3 m- X' R- }; u+ V5 S•        nominal size 2.75”x3”x1/8”
# p0 \( M5 {3 P$ _( }) N- H•        Actual size 2.734”x3.012”x0.139”
3 n/ w$ J( [4 _•        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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