AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
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# o: O" u0 J; ?0 F& Twww.newmaple.com/video/autocad0006
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1. Title block brief introduction
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2. Text height
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1 @6 K6 j  {2 a0 C6 D' h, |, V4 w3. Viewport
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1 D$ o9 U; S. v- L: Q4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad
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special symbols
%%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
AutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
+ i  o; `; S# @  ]www.newmaple.com/video/autocad0007
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4 ]% P' p/ T) v4 ~A real sample to review lecture 6

7 l6 V6 N+ x3 J' q. sIntroduction Roughness
. p4 x9 b/ ?. e: Y) e* N# r# gQuick check hole size and position
! {0 A0 q& d0 t7 v4 i' LIntroduction O-ring groove
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: K4 D& C3 K" u; TSurface roughness
, L  w1 h9 ]; j6 }/ Q  k0 @  ^0 d•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
% p, @( I; p& O% `4 L: l•        Sample 250 micro-inch = 6.3 micrometer
' a  ]' B3 {( a& e  |(250X25.4X10-3)
•        250 micro-inch – forging surface
' ~7 X$ u! ~  _4 S/ m7 c•        125 rough machine, 32 fine machine
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Inch size O-ring
•        O-ring number 232
8 x, Z/ g& x& C1 c0 M•        nominal size 2.75”x3”x1/8”
) `, @! ?( E6 M1 ?/ U- T- B/ D•        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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