AutoCAD 实战讲座

DaShan

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

$ O# ~! W8 n$ S3 t: P; S6 l) c( ?$ @www.newmaple.com/video/autocad0006

: L- ]% @9 D' L$ c* c0 ]1. Title block brief introduction
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+ z4 I9 x" f5 q2. Text height
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9 n$ k' U0 `! y9 g3. Viewport

4. Dimensions style brief introduction
' e6 h, q9 r) G8 ~* ^9 Z•        Tolerance in Mechanical / Autocad
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# {, ]# l& {4 r5 E' `9 qspecial symbols
%%D degree sign
- Z# e. [! I% ]' D) j7 w5 L4 j%%P plus and minus sign
; F2 d9 F$ A; ]$ X# Y" v%%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
New Maple AutoCAD (7)
www.newmaple.com/video/autocad0007

) w* }0 ], ^9 xA real sample to review lecture 6

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)
* ?" Q0 m: u1 k& Z. k# r: K•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine

( }0 z) I# w4 i* ~( AInch size O-ring
" {5 i7 p2 i8 u•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
  v; C/ {0 r. u•        Actual size 2.734”x3.012”x0.139”
- f* Y' D7 t" R, q•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
7 I) L5 u& a) J•        One of OD or ID is close standard size

http://www.newmaple.com/forumdisplay.php?fid=28