AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
  Q: a) e( A4 i. bhttp://www.newmaple.com/forumdisplay.php?fid=28
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4 ^: U, C. p4 n. |- x8 K6 H/ [6 jwww.newmaple.com/video/autocad0006
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4 b1 ^# U- g) A% z1. Title block brief introduction
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2. Text height

3. Viewport
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9 f/ C, ~& C; l6 a: q% \7 Z& o/ }4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad

special symbols
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%%P plus and minus sign
* K7 l1 c7 ^, Q+ E%%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
8 L; D  R9 s. B2 K9 kNew Maple AutoCAD (7)
5 o( r% r1 [* X; A+ V; q: ^0 Bwww.newmaple.com/video/autocad0007

. m% w5 {! U& V4 d; m1 q) WA real sample to review lecture 6

; ~) m, U7 U2 v7 I) qIntroduction Roughness
* \& V% l; ^7 G) d- MQuick check hole size and position
Introduction O-ring groove

Surface roughness
•        Imperial Unit: micro-inch 10-6 inch
" `6 Z  g' l, e. t8 R  P•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
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•        250 micro-inch – forging surface
  y5 j3 e* u* Y2 j- R8 z. Z* D: G•        125 rough machine, 32 fine machine
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7 I$ F2 i1 ^* ]0 l; SInch size O-ring
•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
" n; I6 m: s% b$ g& W! h7 Z•        Actual size 2.734”x3.012”x0.139”
•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
& d0 L6 P- A+ k: r) \6 J' d( ^•        One of OD or ID is close standard size

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