AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
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/ f2 w* Y) |$ bwww.newmaple.com/video/autocad0006
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+ o  n- Z% u5 x2 [* O3 _1. Title block brief introduction
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2 }! F& D/ F6 \" W/ F3 e* U2. Text height
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" m& S( }1 \/ F' V3. Viewport
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4. Dimensions style brief introduction
1 Y' S" o* S3 W( H* E$ Z9 R•        Tolerance in Mechanical / Autocad
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special symbols
%%D degree sign
%%P plus and minus sign
; M( R+ q, H4 C; [, `! W%%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)
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A real sample to review lecture 6
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' A1 F6 |# }$ ~( n9 W5 M! VIntroduction Roughness
9 Z$ E$ z2 f" h$ O" wQuick check hole size and position
Introduction O-ring groove

. }1 o; y6 a6 {8 h# [Surface roughness
+ Y2 B" G0 V7 N. m9 t& V•        Imperial Unit: micro-inch 10-6 inch
•        Metric Unit: micrometer 10-6 m
& s" z" d1 C5 P" r* G: u•        Sample 250 micro-inch = 6.3 micrometer
) ]6 x# u, M5 W( f9 X  R% D0 ^$ ]' A(250X25.4X10-3)
! q0 P5 K# z$ M! f/ J2 r/ ?+ x9 _) T•        250 micro-inch – forging surface
6 I+ O$ j4 ^  c, x•        125 rough machine, 32 fine machine

, `, }. n1 b! f! H, n; J7 r/ IInch size O-ring
•        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
9 c3 E" R+ D" n•        One of OD or ID is close standard size
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