AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
http://www.newmaple.com/forumdisplay.php?fid=28
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www.newmaple.com/video/autocad0006

8 _4 E) P/ ?3 j4 t3 [* V; m! K  g7 S% W1. Title block brief introduction
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2. Text height

" q" d! ^4 y5 X3 v( }3. Viewport

. f4 z/ k" ?" v$ b0 X: w1 _4. Dimensions style brief introduction
" Y0 Q, n; I( P2 I$ R- y3 @•        Tolerance in Mechanical / Autocad
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) I  D8 [5 t( r+ k9 ]4 \special symbols
+ {! i: J  s5 F3 j6 J4 J5 R3 {%%D degree sign
2 t' E' ^. [1 H%%P plus and minus sign
%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
/ U) R; H' c# xAutoCAD 实战讲座第七讲
6 Z% k& F  P! Q; tNew Maple AutoCAD (7)
& K+ o- @7 a( E) L: T7 a2 b. W# ?www.newmaple.com/video/autocad0007
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' r5 R# `: u& n! \; \" U( q* ZA real sample to review lecture 6
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Introduction Roughness
Quick check hole size and position
! t' Q/ `) `" t/ A. W& nIntroduction O-ring groove
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% K- N, V) |) \) Y! d- [" kSurface roughness
•        Imperial Unit: micro-inch 10-6 inch
+ S( l. W8 G  Y- b8 G  e4 e•        Metric Unit: micrometer 10-6 m
% S6 D1 o$ n' Z  k•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
& s# p# S) I. u* p•        250 micro-inch – forging surface
, n) o/ E! N. q•        125 rough machine, 32 fine machine

$ \4 n2 K3 M2 N- g/ H: b& X* OInch size O-ring
' h4 i: n4 l* L, S  A9 a, j•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
: N* r6 U' u0 t2 U3 K5 s•        Actual size 2.734”x3.012”x0.139”
•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
; N  d  u9 V! O  d5 ?1 f•        One of OD or ID is close standard size
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" G, Z2 \4 b0 \# ~) Z0 `6 @  Ahttp://www.newmaple.com/forumdisplay.php?fid=28