AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
( o- i( H1 X+ A) q: m" g6 @" |http://www.newmaple.com/forumdisplay.php?fid=28
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www.newmaple.com/video/autocad0006
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9 W  U2 {; e' [; s: z1. Title block brief introduction

) t! a' a+ w& k3 y2. Text height

3. Viewport

4. Dimensions style brief introduction
8 S. [" E# b  b3 S  |7 P•        Tolerance in Mechanical / Autocad
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/ N3 o* W) C( Cspecial symbols
. C! H/ D/ ]" R' \( f* u' j( Q%%D degree sign
4 D) s6 l! B1 I0 h% d- S0 K%%P plus and minus sign
; O2 R/ M& ]9 u4 L2 w6 `! ^5 U. P%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
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New Maple AutoCAD (7)
www.newmaple.com/video/autocad0007
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0 i" I; K/ r- G% `A real sample to review lecture 6
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Introduction Roughness
9 h  Z7 d' J# }8 {; S  _& i  ]Quick check hole size and position
$ v7 ]) O/ O5 V3 Y$ m9 s5 J3 R& nIntroduction O-ring groove

; }) ?- M5 d1 k3 `. X8 O0 n. g, a3 \Surface roughness
•        Imperial Unit: micro-inch 10-6 inch
$ \) \, h  ~$ o* I8 r- V: z6 L•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
•        250 micro-inch – forging surface
2 }/ x5 f* Y( e( p0 p•        125 rough machine, 32 fine machine
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Inch size O-ring
; K: T6 G5 H- G5 f  p3 c•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
•        Actual size 2.734”x3.012”x0.139”
2 @& T/ s! g6 I& ?7 `•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
" k2 X. ?. ?7 L* I( B•        One of OD or ID is close standard size
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4 T( h2 s0 O( P7 S4 Chttp://www.newmaple.com/forumdisplay.php?fid=28