AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
, R: S" `' S- o1 V8 n9 O: khttp://www.newmaple.com/forumdisplay.php?fid=28
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www.newmaple.com/video/autocad0006
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- ^9 A9 [; ~8 }9 }8 c& G1. Title block brief introduction
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# Z! y( b* u8 I2. Text height

3. Viewport
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0 b  a# Z/ w( s3 c5 I* Q4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad

4 d! a( N: Q( D  R' H8 Fspecial symbols
3 a8 K  d) b$ W- I5 T5 o%%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
# q; h7 P6 M+ L8 k) l+ GAutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
www.newmaple.com/video/autocad0007

/ t7 Y2 _. D, a4 J$ a  aA real sample to review lecture 6

, B8 Z( W8 m: v! S+ O# v) |0 X2 yIntroduction Roughness
  p3 i) f; P- y, M2 ~Quick check hole size and position
Introduction O-ring groove
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2 J. T2 G4 J$ K) M# ]8 ZSurface roughness
/ a- m" @# ]( x# V& y•        Imperial Unit: micro-inch 10-6 inch
$ J: s2 \+ C  P2 \, N% V•        Metric Unit: micrometer 10-6 m
$ V; T1 q$ `7 S8 ^•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
•        250 micro-inch – forging surface
% O( J* U" @; T+ u! ]•        125 rough machine, 32 fine machine
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; c4 ~% i# |9 pInch size O-ring
•        O-ring number 232
8 H5 A0 L. s- |1 i' f2 S: f# S•        nominal size 2.75”x3”x1/8”
, l" d5 @* c0 `•        Actual size 2.734”x3.012”x0.139”
•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
•        One of OD or ID is close standard size
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3 f: d+ M7 H: }' Uhttp://www.newmaple.com/forumdisplay.php?fid=28