AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
: ]6 R+ V. r' v& Ehttp://www.newmaple.com/forumdisplay.php?fid=28
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www.newmaple.com/video/autocad0006
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1. Title block brief introduction

2. Text height

3. Viewport
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' d. _; M8 z, a5 v" P2 q1 q4. Dimensions style brief introduction
. o7 [, {' x9 y# X; D& o7 [•        Tolerance in Mechanical / Autocad

special symbols
%%D degree sign
; w0 X. t" ~% C; [%%P plus and minus sign
8 D% f1 R2 W( {+ J' d! T%%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)
$ ]8 \- ^- b- \& d# Rwww.newmaple.com/video/autocad0007
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A real sample to review lecture 6

Introduction Roughness
7 |: k' e/ `# x4 g) |$ J6 ?- oQuick check hole size and position
Introduction O-ring groove
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5 j3 g; c, b/ i' Y1 dSurface roughness
•        Imperial Unit: micro-inch 10-6 inch
. L- [3 {2 D2 q3 a•        Metric Unit: micrometer 10-6 m
& {1 K" ?3 e: n; o# w+ j/ Z! b•        Sample 250 micro-inch = 6.3 micrometer
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& `- ?# ]  E3 g6 q•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
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$ G9 R8 K- j, OInch size O-ring
& y& q! `/ n! H•        O-ring number 232
& L) v$ [, k) s2 F) t' @! L•        nominal size 2.75”x3”x1/8”
•        Actual size 2.734”x3.012”x0.139”
% x8 d  u- }/ V3 [, U( I•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
% K: l/ z/ a% H5 Q4 ^9 L2 N8 y•        One of OD or ID is close standard size
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9 y% c; N+ S1 S! M* A; Ehttp://www.newmaple.com/forumdisplay.php?fid=28