AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
http://www.newmaple.com/forumdisplay.php?fid=28
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www.newmaple.com/video/autocad0006

' X' r$ ~5 ^$ @3 w5 ^1. Title block brief introduction
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2. Text height
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: V( o6 K, t( x3 o, S3. Viewport

4. Dimensions style brief introduction
( g9 x; E9 B& d•        Tolerance in Mechanical / Autocad

special symbols
%%D degree 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
AutoCAD 实战讲座第七讲
/ s  F1 Z5 j- FNew Maple AutoCAD (7)
www.newmaple.com/video/autocad0007

- `* `- Y+ g5 @# j6 ?% h7 E1 GA real sample to review lecture 6
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* [$ h& ~  S( y. mIntroduction Roughness
Quick check hole size and position
Introduction O-ring groove
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0 |  l9 }3 Q4 ]5 LSurface roughness
•        Imperial Unit: micro-inch 10-6 inch
. ^! s8 y( A' U, O2 ~0 N8 X•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
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* H9 @2 Y! D, ]3 `•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
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2 d# X' S# j1 o7 M) W1 Y+ J) gInch size O-ring
•        O-ring number 232
. f  b4 s) d4 _3 p, r! ~' W•        nominal size 2.75”x3”x1/8”
•        Actual size 2.734”x3.012”x0.139”
•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
- R+ |3 t0 j$ g; t9 `•        One of OD or ID is close standard size
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* a  o. s  p+ thttp://www.newmaple.com/forumdisplay.php?fid=28