AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
: s3 N1 Z* r" G6 q& o" h6 M; Uhttp://www.newmaple.com/forumdisplay.php?fid=28

www.newmaple.com/video/autocad0006
) D) |2 J9 s6 _
1. Title block brief introduction
4 v' G# p/ f3 k2 m# g
2. Text height
/ V4 W4 ?7 {! S: s4 E, w: Q. `
3. Viewport
8 h7 R5 t. P+ C$ u6 i4 J
4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad
/ }0 }. S) a& x' `' |( c" x
/ N! G# B2 C* K4 @6 dspecial symbols
%%D degree sign
%%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)
" j- [5 J4 m" b7 xwww.newmaple.com/video/autocad0007

A real sample to review lecture 6

Introduction Roughness
Quick check hole size and position
- `" l# g; o4 X2 {Introduction O-ring groove

* E2 P( U8 n( S- ]7 ESurface roughness
% S3 x$ |! _' S# e( T8 |6 i•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
: n; m; N# W. J) I) u•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
•        250 micro-inch – forging surface
2 p0 A" {; |+ r1 N( W& H( ?: f9 I' ?8 k•        125 rough machine, 32 fine machine

& ]" c7 g9 o; d* h: `2 a; dInch size O-ring
•        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
* Y) J0 y! J" j& E. P•        One of OD or ID is close standard size

- E$ N0 I* I( bhttp://www.newmaple.com/forumdisplay.php?fid=28