AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
- L0 t! f) \1 yhttp://www.newmaple.com/forumdisplay.php?fid=28

- }! y) O2 J) O/ rwww.newmaple.com/video/autocad0006

! r" j6 g$ x4 H0 F1 P1. Title block brief introduction
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2. Text height
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3. Viewport
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/ E* J8 {; C1 M1 N4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad

5 w2 s9 H) [, {( r/ ?special symbols
%%D degree sign
%%P plus and minus sign
2 z- ?4 d1 F9 D5 P# o( E) W%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
2 M5 q2 D) X1 FAutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
www.newmaple.com/video/autocad0007
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A real sample to review lecture 6

# }4 C* C7 m* }* d3 f9 |3 t& Y, x4 @Introduction Roughness
; L  ~2 R$ r" k- X% u, \+ lQuick check hole size and position
  a5 @# y+ N! E# o0 y% }3 PIntroduction O-ring groove

Surface roughness
•        Imperial Unit: micro-inch 10-6 inch
; X6 v* u! Z2 x+ ~, o5 e•        Metric Unit: micrometer 10-6 m
: U7 \% R3 U' o•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine

Inch size O-ring
•        O-ring number 232
0 m3 l$ X' o7 T3 r( E' n- K$ d•        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
! P! G5 i: q6 N2 a" h•        One of OD or ID is close standard size

, S# K7 _" R) Y  s+ l+ f8 _http://www.newmaple.com/forumdisplay.php?fid=28