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

) P4 A( C- _6 N% i0 O) L1. Title block brief introduction
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4 |3 @6 ~! n0 G3 x. v# c5 L$ Z2. Text height

3. Viewport

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

! ^/ E9 {! E$ T( N! _  T' B$ |special symbols
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%%P plus and minus sign
) v2 v: o0 ?+ q  E1 }+ H%%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
9 x2 v" n' D$ w8 I! d: dNew Maple AutoCAD (7)
' O9 s- L: c# J$ ?; p' i% Uwww.newmaple.com/video/autocad0007

A real sample to review lecture 6

Introduction Roughness
- [1 `; r, L# A5 Z9 G: }* ?7 K8 F2 `Quick check hole size and position
3 o+ c7 B' Z1 }6 n/ @- ?6 |: WIntroduction O-ring groove
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Surface roughness
) S! b/ N6 \7 ?" R' ?) w•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
# _9 B" ]3 f, Q- o/ P6 x•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
( O# s, f1 S) ]6 w5 d2 A( d•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
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( C7 k  K- @- C4 m/ a9 N# s' aInch size O-ring
•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
/ F% T' X  A; i/ S2 V•        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
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2 p& S4 d2 H2 n! A; m9 s6 ohttp://www.newmaple.com/forumdisplay.php?fid=28