AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
( ^3 r2 C( r+ Bhttp://www.newmaple.com/forumdisplay.php?fid=28
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$ @; F0 T* B' q0 E: H5 L; ?+ J, ~www.newmaple.com/video/autocad0006
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2 G2 R) x4 d# P1 v8 Q, f$ w1. Title block brief introduction

; |0 p6 c# j  x% B7 Y  n" @+ e2. Text height

3 N4 D4 C& }$ I3. Viewport
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, e; X( W  V+ q) D5 Y4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad

& H6 J  z) m5 ]9 m" j* g# A  aspecial 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)
2 x- a" Z1 \7 D3 k6 j" C5 lwww.newmaple.com/video/autocad0007

A real sample to review lecture 6
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Introduction Roughness
7 l, K/ ?' G; [* [  A! k( mQuick check hole size and position
, L5 R0 M. E! ?1 d/ R8 J, v( IIntroduction O-ring groove

Surface roughness
* O4 u) _& x4 B1 B  i•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
- ?. V) Y/ |# o/ b# j(250X25.4X10-3)
, p# [& K* E$ ~1 Y•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine

$ V# L6 P* `( }/ X  R! J3 [Inch size O-ring
•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
2 m2 `- N, I7 u•        Actual size 2.734”x3.012”x0.139”
•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
+ k4 l( p4 r2 v' B- W•        One of OD or ID is close standard size

$ L* ]+ y+ A! j  rhttp://www.newmaple.com/forumdisplay.php?fid=28