AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
, W' t$ ~: ?9 Qhttp://www.newmaple.com/forumdisplay.php?fid=28
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& _2 @" y7 S" g! f& c, Xwww.newmaple.com/video/autocad0006
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5 }: i& A5 L$ r5 q, M$ I1. Title block brief introduction
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$ J5 s' O& p9 b: ]2. Text height

  S. t& p. J9 H9 w3. Viewport

; @: ?: K+ d9 \3 l- T0 X" D+ U8 q; I4. Dimensions style brief introduction
) d# Z( s/ c6 z. @& c, v( [4 I•        Tolerance in Mechanical / Autocad
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9 D4 J& M% i: s; J$ r" jspecial symbols
3 W: q9 U& K4 ^* S% s7 [%%D degree sign
%%P plus and minus sign
2 S3 F8 a0 c7 `( Y4 D& ~/ \4 O%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
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New Maple AutoCAD (7)
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$ E4 V/ R" L9 N- _& vA real sample to review lecture 6
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  ^" u7 k3 r! s5 h0 E! |% wIntroduction Roughness
Quick check hole size and position
. V$ a$ ]8 G( p4 ZIntroduction O-ring groove
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  w! j  ^) Y4 x. ~Surface roughness
4 W$ \% E2 q$ v4 F•        Imperial Unit: micro-inch 10-6 inch
! d4 ^1 x$ Q7 z) H* w5 u% L•        Metric Unit: micrometer 10-6 m
) }& m' n8 E1 T% g0 J% M: ], m•        Sample 250 micro-inch = 6.3 micrometer
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2 G2 J3 ^7 v1 `1 h) p; v•        250 micro-inch – forging surface
" k! ]; O  O9 s, L9 y6 J•        125 rough machine, 32 fine machine

Inch size O-ring
$ [$ s/ p) A0 s" w+ e# x, e7 e1 F•        O-ring number 232
: s5 z$ r9 E) B" W) r, k: h•        nominal size 2.75”x3”x1/8”
•        Actual size 2.734”x3.012”x0.139”
# Q3 ]: `/ ^( R& _; V& {•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
•        One of OD or ID is close standard size

8 t- K- X4 I/ V! dhttp://www.newmaple.com/forumdisplay.php?fid=28