AutoCAD 实战讲座

DaShan

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

www.newmaple.com/video/autocad0006
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" J! ^! y1 y; [; ~4 W0 w& E1. Title block brief introduction
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. u+ p: O; m! J3 o2. Text height
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* U; x8 O6 n% L9 ]- [+ U3. Viewport
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4. Dimensions style brief introduction
- k" _# @- s' }% p6 v# h•        Tolerance in Mechanical / Autocad

+ x: h0 v) S. o; U8 y5 Especial symbols
%%D degree sign
%%P plus and minus sign
%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
- k! R% u- b. {2 P# _* @AutoCAD 实战讲座第七讲
; A* B( C5 l. T9 ~New Maple AutoCAD (7)
! G3 k. x/ e) o! \www.newmaple.com/video/autocad0007
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8 a# j" b! S8 ^6 `3 MA real sample to review lecture 6
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Introduction Roughness
* L, b! J$ f' [+ s3 A- vQuick check hole size and position
  [- c- {. z: y4 OIntroduction O-ring groove
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Surface roughness
/ I' O+ \- c5 [! }: F- c! C' }$ k/ Y•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
6 ?6 c3 }& }, j' u/ Y7 ?•        Sample 250 micro-inch = 6.3 micrometer
! @7 ]2 E4 d2 x- w2 @1 N(250X25.4X10-3)
2 P, {4 |+ j$ Z- a) ]•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
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3 `% C- T, E6 X0 J9 qInch size O-ring
  r$ ?7 Y. F% x2 X•        O-ring number 232
, R% x) e2 d8 X) O4 h6 f•        nominal size 2.75”x3”x1/8”
# J' |3 V. u9 f! Q+ d•        Actual size 2.734”x3.012”x0.139”
! j$ G0 [7 U8 M7 Z/ ]•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
•        One of OD or ID is close standard size

http://www.newmaple.com/forumdisplay.php?fid=28