AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
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4 `) p" ^- q( f( c0 n* e) @1. Title block brief introduction
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+ G# Z: x9 g8 H* P2. Text height

3. Viewport

4. Dimensions style brief introduction
0 {! w. |3 l- U+ B) r•        Tolerance in Mechanical / Autocad
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special symbols
" [0 ]' |8 ?) p$ I%%D degree sign
%%P plus and minus sign
6 \3 D6 d  M/ [8 F6 F) D%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
/ x4 f3 R8 P( SAutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
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A real sample to review lecture 6

4 h3 ^+ o. J5 a% }8 AIntroduction Roughness
Quick check hole size and position
Introduction O-ring groove

Surface roughness
, D2 v1 a" w# x7 h•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
•        250 micro-inch – forging surface
( ^, \" w5 @, ]6 x9 `•        125 rough machine, 32 fine machine
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Inch size O-ring
* m) h3 w6 L8 c& L, S8 K•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
•        Actual size 2.734”x3.012”x0.139”
9 R3 M8 v* G7 m1 c# ]0 s/ R6 l" {•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
' x  ]7 Z% j7 t3 S- Q3 t) E7 ^•        One of OD or ID is close standard size

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