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
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% i7 Y: @. _- {- p1. Title block brief introduction
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/ x9 l) G- M& h' J# ~1 [2. Text height
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3. Viewport
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4. Dimensions style brief introduction
* g1 V0 {' f# z* t$ I% {•        Tolerance in Mechanical / Autocad
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0 D5 o& p0 b3 m3 _special symbols
( `" s% n' _8 \) Q. W%%D degree sign
( c. h+ R- u) D/ U%%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
New Maple AutoCAD (7)
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A real sample to review lecture 6
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Introduction Roughness
* D) P- F7 P5 n5 g5 a/ lQuick check hole size and position
2 q/ C2 k) f/ r7 A6 ]* C7 a; tIntroduction O-ring groove

Surface roughness
6 R% Z4 l+ E- x% A: ^•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine

Inch size O-ring
/ g8 U& ?3 E/ I•        O-ring number 232
* S1 _4 ^" u7 C* v. `* x•        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