AutoCAD 实战讲座

DaShan

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

; g; R6 ~% c; K4 Fwww.newmaple.com/video/autocad0006
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3 n; I, e3 U: q  V1. Title block brief introduction
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2. Text height

, J( l4 ?5 g0 E/ x' E3. Viewport

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

special symbols
$ A2 n# n6 Q* h; Q& O9 T%%D degree sign
%%P plus and minus sign
& k' C5 e: N  J, @%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
. ?% J8 n+ z4 ^9 T" H! ZAutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
www.newmaple.com/video/autocad0007

A real sample to review lecture 6

Introduction Roughness
Quick check hole size and position
3 T* J; C, I, h+ I0 j& FIntroduction O-ring groove
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3 T  a! \( `5 SSurface roughness
•        Imperial Unit: micro-inch 10-6 inch
$ E% P5 C: ~. p  p•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
' g1 l- ]  L: |3 n+ O  ]•        250 micro-inch – forging surface
, j6 k! Z$ t1 @- i•        125 rough machine, 32 fine machine

Inch size O-ring
4 ^4 _. x+ }+ s* \2 n* t7 s•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
•        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

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