AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
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" H8 P- ]5 f1 b4 U( A* R7 k/ p1. Title block brief introduction

2. Text height
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3. Viewport

4. Dimensions style brief introduction
8 w: G! |9 P- z$ n•        Tolerance in Mechanical / Autocad
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special symbols
%%D degree sign
  e; [1 Z. H$ B& d: x5 l%%P plus and minus sign
  [  B* N! Y+ V3 W$ }%%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)
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; e3 {% K; ]% Z+ L, V0 q- d$ j' ^A real sample to review lecture 6
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Introduction Roughness
Quick check hole size and position
Introduction O-ring groove

# p8 P: l! j) X2 sSurface roughness
* Y5 {9 I% w6 u2 G- h& S•        Imperial Unit: micro-inch 10-6 inch
) E, ?$ X: z6 Q+ T  ?. [# [' p. E•        Metric Unit: micrometer 10-6 m
  w2 n" Q7 y, S8 J$ Y. P6 P, H4 ]•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
" P4 [% ~# l# J•        250 micro-inch – forging surface
•        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”
7 D& e$ Z6 L1 V& i0 t) p: @1 {, l3 K•        Actual size 2.734”x3.012”x0.139”
•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
•        One of OD or ID is close standard size

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