AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
" [- s) K$ A1 fhttp://www.newmaple.com/forumdisplay.php?fid=28
+ r+ G, {5 m% ]4 Q6 K4 e
5 d; b7 c; @5 s7 ?www.newmaple.com/video/autocad0006
3 U9 b. j* F$ [( j3 g
1. Title block brief introduction

) N9 z& e% ]* A' V0 G( ~3 |2. Text height
" ]. Z- H  X% Y8 w' o7 R
. c* I; D* X4 \9 k0 N3. Viewport
* `6 |- A) q' X
4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad

' o8 C! q. m5 g0 [# U8 j7 K8 Y7 `special symbols
4 U: h+ m1 R) T$ y5 _%%D degree sign
" L! t! K) C; K3 J0 S. w%%P plus and minus sign
+ N: h3 T* H* N1 A; A%%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 R% K; P0 h  S5 zNew Maple AutoCAD (7)
' l3 j: A! t- w: p4 I5 dwww.newmaple.com/video/autocad0007

& v" l6 I. ~+ U2 I# E6 l. f( SA real sample to review lecture 6
/ E0 {( m+ p! B! w1 C, `% S! B: C8 u
Introduction Roughness
Quick check hole size and position
& X: C+ C' `" e; b/ J1 oIntroduction O-ring groove
1 |- i5 O- S/ n$ `# g  D
Surface roughness
•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
+ i2 {/ r( N! ^7 @7 T; S•        Sample 250 micro-inch = 6.3 micrometer
, y( x8 j8 j# i; S: M1 Z(250X25.4X10-3)
6 {- [) V4 ?, j7 j9 {•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
! w0 O4 e4 n: v2 D) R
( ^% R* M8 t' VInch size O-ring
3 c: J& h4 ~0 a9 S! ?4 T•        O-ring number 232
3 v: y( q" q) ?6 }•        nominal size 2.75”x3”x1/8”
1 c! l9 g5 ^+ j& n•        Actual size 2.734”x3.012”x0.139”
' w' O% m& u0 p3 B/ N6 S6 D: D$ W7 f•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
" ?( R2 L+ P* B; y7 x•        One of OD or ID is close standard size
5 ]/ Z. z+ i5 |. u! G* \; C
  j% `4 {$ P, C4 _! Q- Ohttp://www.newmaple.com/forumdisplay.php?fid=28