AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
2 S! _1 G& `* g1 F0 @( rhttp://www.newmaple.com/forumdisplay.php?fid=28
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. P) q, H+ S3 i$ xwww.newmaple.com/video/autocad0006
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3 y7 s, a! S; I' H- S1. Title block brief introduction
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5 H; F* @! f. T: V- f2. Text height

1 \/ N0 ^  p& C: V3. Viewport
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; G, l' p" n* W% X3 R4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad
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special symbols
%%D degree sign
" v" ^' c+ j% Q& x0 L5 H%%P plus and minus sign
# }) V3 g) Z( `3 G%%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
& M) U* g2 m; H: C: T" O& vNew Maple AutoCAD (7)
www.newmaple.com/video/autocad0007
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A real sample to review lecture 6

' O3 E/ x$ s8 oIntroduction Roughness
9 m3 q" ]# f  r+ u8 pQuick check hole size and position
Introduction O-ring groove
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# P6 {8 K) N  V/ lSurface roughness
•        Imperial Unit: micro-inch 10-6 inch
: o: \$ M; H9 L% v7 a. `•        Metric Unit: micrometer 10-6 m
: l( p; h2 p/ y3 U•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
& n1 ?% M9 @# ^. ?•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
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Inch size O-ring
•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
: p# c: p6 T( C$ I: {) R•        Actual size 2.734”x3.012”x0.139”
' ]# H8 w) L7 M' b7 i•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
4 ]: t0 \0 O: E•        One of OD or ID is close standard size

# `/ [* J3 w* c- i4 Rhttp://www.newmaple.com/forumdisplay.php?fid=28