AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
6 m5 U3 ^+ B8 J3 Q4 N) l9 p2 Ohttp://www.newmaple.com/forumdisplay.php?fid=28
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www.newmaple.com/video/autocad0006

1. Title block brief introduction
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2. Text height

3. Viewport
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  D$ ?8 _0 h( d4. Dimensions style brief introduction
) [2 }' @$ G4 f# t; U•        Tolerance in Mechanical / Autocad

* K: p& q6 Y5 y" Bspecial symbols
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%%P plus and minus sign
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恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
# @% q, n& i2 GAutoCAD 实战讲座第七讲
- I* Y9 Z; }5 y/ Q0 oNew Maple AutoCAD (7)
www.newmaple.com/video/autocad0007
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: F! A4 z3 V2 j* N- NA real sample to review lecture 6

Introduction Roughness
" b) p$ Q5 }7 {Quick check hole size and position
8 U6 R7 j* z7 `2 w& mIntroduction O-ring groove

Surface roughness
+ I4 x' z- N. ]' a3 m•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
6 S- j+ B& s# N9 p) p(250X25.4X10-3)
" ^& c5 n% ?& }  X) H•        250 micro-inch – forging surface
5 |* F4 N# I! V•        125 rough machine, 32 fine machine

& S- B9 R& n% D; U* b9 BInch size O-ring
. d/ a5 w3 C1 h$ O4 o* E•        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

' g; \5 l/ q- ?4 c1 C' ]http://www.newmaple.com/forumdisplay.php?fid=28