AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
http://www.newmaple.com/forumdisplay.php?fid=28
/ j, I! A+ ?3 D. [2 C
2 k' N* `2 A6 W# w3 u5 f; r' r- Iwww.newmaple.com/video/autocad0006
- R  P  G# q/ k/ [3 F+ p+ a
1. Title block brief introduction

6 j6 X3 _, a1 H: u/ H; W2. Text height

3. Viewport

" z+ f; ^5 ]: N2 S! i7 R4 G4. Dimensions style brief introduction
* P, {: [4 b7 M9 O# P! ]- P$ h•        Tolerance in Mechanical / Autocad
" h( I, b2 m; A8 h8 C  b/ f
. N. [! y: O# _0 l0 aspecial symbols
( h- H/ d% J& W" r  B%%D degree sign
1 ]  @# z5 w: r" K. h%%P plus and minus sign
1 q( a5 @0 U  i$ v7 |0 @%%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)
1 R+ j/ u. P8 b: S  Q7 Uwww.newmaple.com/video/autocad0007
- e( g' F6 ~! y
A real sample to review lecture 6
+ Z. f; n) ^1 }; Y5 z. P9 c$ C& h
Introduction Roughness
Quick check hole size and position
9 l: J2 P' e3 l) t% S; j  Y* ?Introduction O-ring groove

9 o; D# A4 ~2 [. }5 p6 OSurface roughness
•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
) i& \, r3 \# I•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
5 A8 k" i! w6 u9 H/ h! _•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine

( D) A5 f9 o6 t' Y  c' m% cInch size O-ring
•        O-ring number 232
* O5 b+ n$ w7 L•        nominal size 2.75”x3”x1/8”
+ d8 F6 r' v9 c•        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

. y: N' I! ?; f6 V/ V/ X, L7 Thttp://www.newmaple.com/forumdisplay.php?fid=28