AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
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7 _9 f+ Z5 e9 ^' V: z- i- Owww.newmaple.com/video/autocad0006
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1. Title block brief introduction

2. Text height

3. Viewport

+ p% A( V; I% h8 i% e+ j: t5 q4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad
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! I& z7 G6 r* s4 ?  }4 L, jspecial symbols
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%%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
! N9 l7 c! N) o( S$ W3 K" EAutoCAD 实战讲座第七讲
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www.newmaple.com/video/autocad0007
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A real sample to review lecture 6
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Introduction Roughness
Quick check hole size and position
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# _8 M, J' P6 L( p9 O- m7 L% PSurface roughness
•        Imperial Unit: micro-inch 10-6 inch
: b$ V* H' U0 F" a5 ?•        Metric Unit: micrometer 10-6 m
$ c, L; [/ E+ }- U- X•        Sample 250 micro-inch = 6.3 micrometer
(250X25.4X10-3)
, _- g% C. U8 M  f; n•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
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: N& w# a2 k5 @8 j( t/ SInch size O-ring
4 K- F. U. i! p! }0 `  n- b/ f# |! @5 C•        O-ring number 232
•        nominal size 2.75”x3”x1/8”
•        Actual size 2.734”x3.012”x0.139”
•        Static surface seal groove depth 0.101~0.107 about 25% squeeze
0 ^' e3 B% }6 e! i0 {•        One of OD or ID is close standard size

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