AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
( u8 B& C+ @' Y+ N) khttp://www.newmaple.com/forumdisplay.php?fid=28
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www.newmaple.com/video/autocad0006

1. Title block brief introduction

$ t4 h7 T! B4 k  d2. Text height

3. Viewport
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/ N3 i/ S7 }' @7 |) k$ p4. Dimensions style brief introduction
) P9 t9 P/ @% i* @# U( s- T. G•        Tolerance in Mechanical / Autocad
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special symbols
" h/ b% z9 R; T" K%%D degree sign
# d6 d2 M7 K1 H" }) 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
AutoCAD 实战讲座第七讲
' `! x8 j$ H* l+ w* a7 y2 Y+ A- XNew Maple AutoCAD (7)
* B  g& e2 g- a% t* ywww.newmaple.com/video/autocad0007

A real sample to review lecture 6
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$ E# i2 Y! m- K) h3 HIntroduction Roughness
7 V2 c# K* B% p/ DQuick check hole size and position
Introduction O-ring groove
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. L( G3 N0 @4 h4 t  xSurface roughness
8 d' G" o( H) C* r3 k& ^% o•        Imperial Unit: micro-inch 10-6 inch
9 q! E7 g: V6 o  Q: g•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
; ~9 P0 g( a/ s# i8 L(250X25.4X10-3)
2 H. S# x& \! m; E: u•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
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3 @' e2 f9 c+ _, g* tInch size O-ring
•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
•        Actual size 2.734”x3.012”x0.139”
( b+ L6 b; ~% C  ~•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
: m; L- Y6 w! m, I4 w" ?•        One of OD or ID is close standard size

http://www.newmaple.com/forumdisplay.php?fid=28