AutoCAD 实战讲座

DaShan

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

& Z, c$ N" E# }9 a" f9 j7 u* ~www.newmaple.com/video/autocad0006

1. Title block brief introduction

+ F/ m. V8 |  o6 l2. Text height

5 w$ u! l# v* P$ x2 d: d3. Viewport
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4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad
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3 D5 m' N% Z6 Z9 J5 }special symbols
%%D degree sign
, S1 B! m& i0 B%%P plus and minus sign
  |+ Z5 p# B* G%%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
4 {" ~3 i" ]4 h$ D" r) QNew Maple AutoCAD (7)
3 q+ `" n* s/ ~" W2 @; ~: Fwww.newmaple.com/video/autocad0007
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A real sample to review lecture 6

Introduction Roughness
Quick check hole size and position
Introduction O-ring groove

' y$ Z1 U6 ~& j9 k! N8 gSurface roughness
# A+ u6 q5 |  y& I# w/ n% J•        Imperial Unit: micro-inch 10-6 inch
) e# Z- ]- `6 B, h•        Metric Unit: micrometer 10-6 m
4 t% t% E$ D: d2 }; h6 w•        Sample 250 micro-inch = 6.3 micrometer
, y( b7 Z7 `3 g9 A/ c$ R0 \/ _(250X25.4X10-3)
•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine

Inch size O-ring
•        O-ring number 232
& V. Q+ P0 V6 ]9 M) m3 g$ r4 e•        nominal size 2.75”x3”x1/8”
0 @, M& R1 S; s/ p9 \$ r4 t- I•        Actual size 2.734”x3.012”x0.139”
•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
) Q( v- z) i% g•        One of OD or ID is close standard size

$ E6 _4 i' Q7 ?$ ^0 I7 Mhttp://www.newmaple.com/forumdisplay.php?fid=28