AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
, H% W6 w; A1 v- ^http://www.newmaple.com/forumdisplay.php?fid=28

www.newmaple.com/video/autocad0006
5 }: A+ M) a+ g! [0 r5 K: g1 n, X
7 r3 Z; e6 v% t: u! n( V. h1. Title block brief introduction

, `: r: R' j9 i3 ?  Q5 X2. Text height

) q$ s9 ?8 V& w8 x9 t) I3. Viewport

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

special symbols
%%D degree sign
( h2 @! K6 w4 S" Y% t%%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
0 L! e5 D* r6 u: m2 P! _: D' xAutoCAD 实战讲座第七讲
9 w/ o- W* ~- \1 t! cNew Maple AutoCAD (7)
% D! c4 Z0 F% C; K( X- Twww.newmaple.com/video/autocad0007
0 S9 E. q* t3 F3 h  p
A real sample to review lecture 6

Introduction Roughness
# ?: D7 L) _, W" X& q* |* L0 oQuick check hole size and position
Introduction O-ring groove

Surface roughness
•        Imperial Unit: micro-inch 10-6 inch
3 I) [: L) w; \6 u•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
. i3 K1 k1 [0 ^(250X25.4X10-3)
•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine

6 l* A: S% B& iInch size O-ring
$ Z/ I$ ?' z- c7 P+ @3 M! z- D( B•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
•        Actual size 2.734”x3.012”x0.139”
3 X5 \% E$ N& L! o•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
: H$ |0 g  T2 |0 w•        One of OD or ID is close standard size
9 z0 i5 t3 B" ?
1 {% g2 ~# B& }2 n- \  h- ohttp://www.newmaple.com/forumdisplay.php?fid=28