AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
http://www.newmaple.com/forumdisplay.php?fid=28

www.newmaple.com/video/autocad0006
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1. Title block brief introduction
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! d3 V6 @1 D" r0 x! R; q( f2. Text height
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! \: l) }, X3 w1 i3. Viewport
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4. Dimensions style brief introduction
; v: h! j8 {4 s" e! W4 Y8 U•        Tolerance in Mechanical / Autocad

* K7 m3 L4 Y, n7 n0 vspecial symbols
; @1 ?, }  K/ t/ }: D0 Q%%D degree sign
6 Z3 ~8 M1 t& k%%P plus and minus sign
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恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
6 V/ w% P4 L- Y0 O' i  E: z. lAutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
www.newmaple.com/video/autocad0007

A real sample to review lecture 6
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Introduction Roughness
/ n* r: p0 A- E' j  Y, J0 iQuick check hole size and position
& Q" S5 V5 e3 A" S& ~Introduction O-ring groove
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# W3 k; f0 }" n% V, rSurface roughness
•        Imperial Unit: micro-inch 10-6 inch
- B) s0 W9 E9 b% n) T•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
•        250 micro-inch – forging surface
5 r  P" T4 Q- ~* G' ?% q•        125 rough machine, 32 fine machine

Inch size O-ring
/ _- M" y' |4 `4 }•        O-ring number 232
•        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
•        One of OD or ID is close standard size
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http://www.newmaple.com/forumdisplay.php?fid=28