AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
http://www.newmaple.com/forumdisplay.php?fid=28
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; e/ U7 Y+ u2 w4 Dwww.newmaple.com/video/autocad0006
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& T3 Q) Y1 Y0 \/ w) D: k* N; i$ |2 j: G1. Title block brief introduction
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8 T4 d4 x/ s+ w) p7 @$ j; W2. Text height
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3. Viewport
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4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad

! k0 c+ A" G3 Dspecial symbols
- c9 |8 A) Z7 t- d  O%%D degree sign
%%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
AutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
www.newmaple.com/video/autocad0007
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/ H( J( C- q+ t6 C  W& ~A real sample to review lecture 6
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Introduction Roughness
3 O: Q' L5 l/ [6 IQuick check hole size and position
8 z  J9 `5 S8 \1 n) T0 [7 E* uIntroduction O-ring groove

) L9 ^) P, g: \) J- x1 i& [4 ?5 HSurface roughness
9 S7 s  @( z/ F& b: N6 _& r•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
6 z& R, g- e1 G& h•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
" V3 S" w& A9 n; v  y# d•        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”
•        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

" l. O" f# \) Y4 l4 ]. ?" Vhttp://www.newmaple.com/forumdisplay.php?fid=28