AutoCAD 实战讲座

DaShan

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

www.newmaple.com/video/autocad0006

1. Title block brief introduction
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9 J* V4 ~+ E3 P/ G. ^0 d/ p3 q2. Text height
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# R1 a4 o4 ^, H; `; P# Q4 K& c' o3. Viewport

4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad
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" c$ P+ J/ Q& J2 C: n! `; Zspecial symbols
1 ~1 D: s. P& p  R0 W; [& I6 }; S%%D degree sign
%%P plus and minus sign
2 L2 T2 f) @' O4 F( t%%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
  @) b: B0 c' W( w1 J4 MNew Maple AutoCAD (7)
www.newmaple.com/video/autocad0007
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7 n, G& [/ ^, z" c% l* cA real sample to review lecture 6

8 O) h# o: F3 JIntroduction Roughness
/ l3 [; K0 w* B3 eQuick check hole size and position
Introduction O-ring groove

Surface roughness
2 _  @: |2 F7 w$ V. X( H; v•        Imperial Unit: micro-inch 10-6 inch
  B+ \# y2 U6 p: q- u1 X& [•        Metric Unit: micrometer 10-6 m
; Z- l' c' @" U, @0 [! ~# P& J•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
, S: J+ @- u* `•        250 micro-inch – forging surface
# S4 O4 X+ u- ]* c5 \* `•        125 rough machine, 32 fine machine
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Inch size O-ring
7 A0 X# k: _' Z1 d1 @/ g8 g•        O-ring number 232
$ |' R5 f+ e& D* |; h$ i•        nominal size 2.75”x3”x1/8”
3 @" Q$ ^9 ?( v) }4 f" y* A•        Actual size 2.734”x3.012”x0.139”
, g- {9 l; I7 y•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
* r1 h' b; i/ R( i5 e7 ?•        One of OD or ID is close standard size
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- V* Q( E" I7 j4 s9 X% Khttp://www.newmaple.com/forumdisplay.php?fid=28