AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
http://www.newmaple.com/forumdisplay.php?fid=28
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- x0 g0 d; R4 [+ pwww.newmaple.com/video/autocad0006

1. Title block brief introduction

9 H  i1 W! R% w9 r9 A% E% l2. Text height

3. Viewport
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' c# d5 s$ }' @0 G6 `0 L2 A4. Dimensions style brief introduction
8 h9 `: n7 t- Z# P8 a3 H- s  a•        Tolerance in Mechanical / Autocad
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8 C8 z. K! s9 S3 c0 O3 Nspecial symbols
2 k5 L/ p1 f' y5 A, d6 }%%D degree sign
%%P plus and minus sign
9 z0 |$ Z( j$ @: V/ e' c% n%%C diameter symbol

恭喜发财

爱城飞雪

Very practical!

DaShan

[V] AutoCAD 实战讲座第七讲
+ j& g% Z+ v3 F/ A! ?AutoCAD 实战讲座第七讲
New Maple AutoCAD (7)
6 n! t6 E" _0 j0 q7 d" B% C3 nwww.newmaple.com/video/autocad0007

9 F: K8 [" {" W1 W# B' oA real sample to review lecture 6

2 D3 _3 L+ X! F* U4 E6 pIntroduction Roughness
Quick check hole size and position
Introduction O-ring groove

2 H, G, h" ?9 j% l! qSurface roughness
1 E: Q3 {% O+ @) z5 I$ c) B+ l•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
) @, i1 P5 ?1 Q. i$ H! P. K; t(250X25.4X10-3)
•        250 micro-inch – forging surface
/ }9 ^1 [8 t9 Q$ M& [' o" G•        125 rough machine, 32 fine machine

Inch size O-ring
* p& c+ n. X: A% K$ {  a•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
9 b8 ]) U: [/ A0 i0 V4 u$ U* o•        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

2 l3 l' t* o" e' _' j7 \http://www.newmaple.com/forumdisplay.php?fid=28