AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
8 G' J' H) l6 m' A# v& Yhttp://www.newmaple.com/forumdisplay.php?fid=28

www.newmaple.com/video/autocad0006

1. Title block brief introduction
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' _# [. c% f  |2. Text height
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3. Viewport
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; P% i& G' C, H; a5 u& c+ C: o4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad

, H8 i+ D9 [8 |+ A/ {! ~% Dspecial symbols
%%D degree sign
8 ?/ Q  O; G$ ~' J0 |%%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
% B9 k9 j7 V9 V: n. O. INew Maple AutoCAD (7)
www.newmaple.com/video/autocad0007
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A real sample to review lecture 6
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Introduction Roughness
Quick check hole size and position
Introduction O-ring groove
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Surface roughness
/ z5 X8 z+ Y: _; h5 J" H•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
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# D8 t  m* I6 \3 n•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
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% ~6 F. T  F6 h0 KInch size O-ring
•        O-ring number 232
& V0 \  v6 R4 }•        nominal size 2.75”x3”x1/8”
•        Actual size 2.734”x3.012”x0.139”
•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
: a6 o5 `& x" @/ u; q•        One of OD or ID is close standard size

2 d3 }/ j/ n# N0 ~http://www.newmaple.com/forumdisplay.php?fid=28