AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
& P. w, R, Q) }* H, Rhttp://www.newmaple.com/forumdisplay.php?fid=28
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www.newmaple.com/video/autocad0006
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5 e7 _1 Q1 y: q* v$ o1. Title block brief introduction
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( }1 v! r7 z2 s' |  p2. Text height
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/ B: N) E2 C. Y) ?9 H4 O! F3. Viewport
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4. Dimensions style brief introduction
9 `! U- {# G+ U5 I# L•        Tolerance in Mechanical / Autocad
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1 u  ?6 l4 q, v6 J5 P6 C  dspecial symbols
  d7 a$ D4 W; l( f6 {" Q/ b' ^%%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
5 P1 v$ n. s' e$ [9 s5 d1 J: yAutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
www.newmaple.com/video/autocad0007
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A real sample to review lecture 6
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: @7 t! P. h( D8 P2 o/ O7 S2 ]Introduction Roughness
Quick check hole size and position
& R2 D$ c6 G0 C6 |6 {Introduction O-ring groove

1 h3 J. V- V, u' J" i- v. n5 A  a' QSurface roughness
/ ?: _( a( w& d5 `/ A5 H! T•        Imperial Unit: micro-inch 10-6 inch
; @5 l. j" [% A. J) Q- a•        Metric Unit: micrometer 10-6 m
" O5 f7 n& }3 K; t•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
•        250 micro-inch – forging surface
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Inch size O-ring
•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
& f* D: N1 T) y2 u; e- M. q•        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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  f" V* E$ V! P# W" c- N& h) Jhttp://www.newmaple.com/forumdisplay.php?fid=28