AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
4 e- C4 g# D. ^  f4 s2 fhttp://www.newmaple.com/forumdisplay.php?fid=28

www.newmaple.com/video/autocad0006
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1. Title block brief introduction

2. Text height
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3. Viewport
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4. Dimensions style brief introduction
& h0 O: o" s5 n•        Tolerance in Mechanical / Autocad
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special symbols
%%D degree sign
0 j) H2 O9 ]1 h%%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
' s3 r! m8 E+ o* q6 g" M; \, DAutoCAD 实战讲座第七讲
2 w4 j+ r  t% Q2 k0 F: `6 ?1 \# @New Maple AutoCAD (7)
9 D7 J) Q, [. I$ X: |' ?www.newmaple.com/video/autocad0007
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( q# N' G5 w) W# U! J+ {* fA real sample to review lecture 6
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5 {/ X+ R& ?8 B7 zIntroduction Roughness
0 l2 e# m! g7 N& [Quick check hole size and position
) ?2 @5 q1 c; Q1 C. [) wIntroduction O-ring groove

/ V4 G$ C. G$ @* oSurface roughness
•        Imperial Unit: micro-inch 10-6 inch
( B1 _* u! ~- I) u; u1 e# ^$ a& X; L•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
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+ K. P7 R; }0 T9 g•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine

Inch size O-ring
•        O-ring number 232
3 Y( f' y* c( b/ G. d) M•        nominal size 2.75”x3”x1/8”
; K8 y# Z; [+ x9 R& Z5 X•        Actual size 2.734”x3.012”x0.139”
& r7 N) w( W! W6 q•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
$ J3 K/ p4 Z6 D- D7 ?; Z7 i•        One of OD or ID is close standard size
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