AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
2 P  b2 p  Z/ I" Nhttp://www.newmaple.com/forumdisplay.php?fid=28
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" Q. O1 C1 D  ^# h! K* jwww.newmaple.com/video/autocad0006

4 F: E1 r+ O1 i8 S9 ]2 ]" [1. Title block brief introduction
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2. Text height
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3. Viewport
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4. Dimensions style brief introduction
- q  g; B: {, U+ C•        Tolerance in Mechanical / Autocad
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  ?( s. f0 M! X% dspecial symbols
2 P& W3 ~' s5 f* R4 |/ Z%%D degree sign
, I; P5 z; g' ^1 b+ T9 d%%P plus and minus sign
8 C+ B- l7 H1 c# z%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
3 {& C; n9 D/ B( R* Y) BAutoCAD 实战讲座第七讲
4 Q. T. P* |4 u: H. i# nNew Maple AutoCAD (7)
www.newmaple.com/video/autocad0007
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A real sample to review lecture 6

9 g4 g+ v0 C8 J# l3 Q8 [0 yIntroduction Roughness
Quick check hole size and position
Introduction O-ring groove
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Surface roughness
•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
+ {2 h/ Y; h4 h7 _: U•        250 micro-inch – forging surface
) L2 M( c( X  k: ~•        125 rough machine, 32 fine machine

) f" E7 N4 d1 b4 N$ {) w( r: }3 OInch size O-ring
1 u$ e/ {; C8 g' A# K/ M•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
1 w  u) |& D& I•        Actual size 2.734”x3.012”x0.139”
; g. o+ u; P/ o4 N9 k3 K•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
$ i8 q5 P4 q" K5 q•        One of OD or ID is close standard size

8 t2 p5 C# \' E# P; }" chttp://www.newmaple.com/forumdisplay.php?fid=28