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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/ g3 ?/ ]/ ?, N; C9 w/ h) X  r* a1. Title block brief introduction
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2. Text height
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" z0 N% M* P/ R5 }* h5 F/ c+ {3. Viewport
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4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad

. d5 X; W# v- L+ F8 S' w& E. hspecial symbols
: L9 X% P1 F+ A; s- t8 {% p%%D degree sign
4 n, p  L, W5 X* @$ ~5 s" s! G5 v%%P plus and minus sign
. x0 X5 M+ y- ^%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
5 ^/ l* L# w( n, Y5 u2 NAutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
) g7 \" p0 I# Q/ H$ d1 owww.newmaple.com/video/autocad0007
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7 I% e* l! ^( s, EA real sample to review lecture 6

0 ^  \, _! p+ o1 N2 f5 s* gIntroduction Roughness
) \2 d7 V! M( z3 ^9 CQuick check hole size and position
3 A, M+ J- l! }2 }2 f% c( S3 ~Introduction O-ring groove

1 F3 u. @! j# U+ y, _2 CSurface roughness
1 W" N: r# h( C5 e0 ^4 O' h•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
•        250 micro-inch – forging surface
/ a% l7 N5 L. T6 J8 m1 L" g9 S•        125 rough machine, 32 fine machine
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8 F1 g' p( E1 C/ r4 P' R" J! qInch size O-ring
5 a& Q+ n1 `' A1 I7 N•        O-ring number 232
2 U4 L/ f& K' }; ^$ m•        nominal size 2.75”x3”x1/8”
1 R4 Z( p+ ~+ B1 k8 Q3 L  l•        Actual size 2.734”x3.012”x0.139”
5 S( H  O& h6 f  E/ F. 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