AutoCAD 实战讲座

DaShan

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

$ u$ E. K, H3 M! D, V% S$ mwww.newmaple.com/video/autocad0006
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1. Title block brief introduction
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8 U- l7 [  G* l! T3 b* a; C2. Text height

, {2 @* G, H; ]- ~3 {% y3. Viewport
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4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad

special symbols
%%D degree sign
%%P plus and minus sign
$ V1 v1 _  w) ]4 K- o4 H%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
3 c) l) Q2 j4 M- i" g' e5 sAutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
; d$ N& G1 J, y1 _, `: Kwww.newmaple.com/video/autocad0007

A real sample to review lecture 6

& G" F. |! l& P. A" F! R* l  k, CIntroduction Roughness
Quick check hole size and position
Introduction O-ring groove

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)
1 b8 J8 b. \9 l•        250 micro-inch – forging surface
2 e/ K' w6 C  ?8 f8 b2 q•        125 rough machine, 32 fine machine
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Inch size O-ring
•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
6 k( Z- C% B! m! r2 P4 t" x& u•        Actual size 2.734”x3.012”x0.139”
•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
; A1 I" D0 b4 G( \$ n3 z•        One of OD or ID is close standard size
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% o- g+ }1 u' W8 @: W! [http://www.newmaple.com/forumdisplay.php?fid=28