AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
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www.newmaple.com/video/autocad0006
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1. Title block brief introduction

; a5 Y; x- k& f: X0 k. A2. Text height

3. Viewport

4. Dimensions style brief introduction
) W3 N5 `1 a2 ~' x•        Tolerance in Mechanical / Autocad

* Z  ^$ z$ i4 m+ t& x, d4 Qspecial symbols
6 R& }! L. m6 k+ k: ?  p9 Z1 K%%D degree sign
- A) N" N& m$ o8 X. e" K) F( q) W%%P plus and minus sign
* `3 Y! m/ n3 }) ]1 j8 w8 C%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
) D9 J8 i/ Y# u- g0 B) PAutoCAD 实战讲座第七讲
* K+ U  D- s2 u9 X2 CNew Maple AutoCAD (7)
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% y9 U" l' Z, T" g1 x! QA real sample to review lecture 6

% o4 e( `2 j6 k7 A( r5 u, |3 ZIntroduction Roughness
Quick check hole size and position
# t# I. C+ H/ ~6 WIntroduction O-ring groove
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Surface roughness
•        Imperial Unit: micro-inch 10-6 inch
( U' t! L3 y& J0 x/ H•        Metric Unit: micrometer 10-6 m
( G8 p6 A+ H9 h•        Sample 250 micro-inch = 6.3 micrometer
* k$ S9 G5 S$ Y. c9 `(250X25.4X10-3)
; y- ~* F( z2 F$ z+ V•        250 micro-inch – forging surface
( q6 B/ o& L! @7 u•        125 rough machine, 32 fine machine
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  k$ n- t! F3 x# i- R$ _2 Y8 QInch size O-ring
" ], C  N! Y2 N" E9 w1 f" C) ^$ x8 D& k•        O-ring number 232
) n5 q8 |- {6 U' [" n2 M•        nominal size 2.75”x3”x1/8”
•        Actual size 2.734”x3.012”x0.139”
: Z2 B0 _$ c( p7 G2 r! }" C•        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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