AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
2 W! X6 M$ l2 [/ Y$ Lhttp://www.newmaple.com/forumdisplay.php?fid=28
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/ i* z- ]) t+ V5 v( B2 r! X4 Z  iwww.newmaple.com/video/autocad0006

1. Title block brief introduction

. @+ d) b/ E# h6 r" g2. Text height
3 B7 S- q$ a" c
3. Viewport

4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad
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, F* ]" l! h" X% x" p" b* l# }special symbols
%%D degree sign
! q+ a! A$ s2 y5 T& ]( t%%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
AutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
( O* U; J. V4 D/ x/ m) q' swww.newmaple.com/video/autocad0007

! N' z4 ]' Z* D( hA real sample to review lecture 6

( n! u. F0 Z, e: o" ]Introduction Roughness
2 f0 V3 f4 E. m$ q! ZQuick check hole size and position
Introduction O-ring groove

Surface roughness
8 ~) _3 I9 S( |8 @/ O•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
  K( H/ w3 H" \$ `) p9 P' A•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
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Inch size O-ring
•        O-ring number 232
6 c' _9 b) ]1 D6 s& g/ W% z0 L5 T$ ~•        nominal size 2.75”x3”x1/8”
' z" \' Q; K& C8 y•        Actual size 2.734”x3.012”x0.139”
$ b' ~0 I( Z' i$ ^# B•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
) z& ^& _6 z. l4 A' A  x•        One of OD or ID is close standard size

7 z( g5 R% i2 N3 O* p0 H/ phttp://www.newmaple.com/forumdisplay.php?fid=28