AutoCAD 实战讲座

DaShan

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

3 A0 l/ {* o7 p7 Vwww.newmaple.com/video/autocad0006

4 L$ }# [! l! U, {0 K% {- ?1. Title block brief introduction
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" l! B- G$ t+ ]2. Text height

5 i1 g$ S; G; g) u. v( V% |+ z6 j' |3. Viewport

4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad

) F6 H7 J/ N7 G. t( q0 Uspecial symbols
%%D degree sign
%%P plus and minus sign
# a! p9 b) T7 B! J/ {( g: B' |%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
% h( i% V/ o+ g6 TAutoCAD 实战讲座第七讲
" {+ Q) v  b6 a3 F# ]New Maple AutoCAD (7)
2 A& r& y; y# r: m* T$ h+ xwww.newmaple.com/video/autocad0007

A real sample to review lecture 6
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# N; F  o% e0 n' uIntroduction Roughness
Quick check hole size and position
: b9 o9 J! W7 X6 i0 U+ q  T5 DIntroduction O-ring groove
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* ^& p+ ^$ A- }- u4 T% s# X- dSurface roughness
# E- Z6 t% F3 v  l•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
# t& b: ~5 l7 r(250X25.4X10-3)
•        250 micro-inch – forging surface
4 q' `- {3 A* _$ I% [# c+ l•        125 rough machine, 32 fine machine

Inch size O-ring
•        O-ring number 232
" ?- y- q9 o' f4 q! U•        nominal size 2.75”x3”x1/8”
: K& ?( T: S$ o6 y1 i7 a5 L•        Actual size 2.734”x3.012”x0.139”
  m& X( w7 d* o) s* R+ }6 w" p3 Y•        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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  R9 u- v* F, C2 U" nhttp://www.newmaple.com/forumdisplay.php?fid=28