AutoCAD 实战讲座

DaShan

AutoCAD 实战讲座
http://www.newmaple.com/forumdisplay.php?fid=28
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, n: ]7 ]* e! iwww.newmaple.com/video/autocad0006
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1. Title block brief introduction
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5 w6 v2 f+ P0 T* l8 s3 p1 C2. Text height

) P; O. E# P6 p5 \$ N8 k0 X, P% m3. Viewport

! s0 V8 Y$ v: W" m4. Dimensions style brief introduction
•        Tolerance in Mechanical / Autocad
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special symbols
%%D degree sign
! X, m! V% R! Q$ F1 `%%P plus and minus sign
5 z, K* @/ ~/ t' P! ^# l$ o%%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)
www.newmaple.com/video/autocad0007

" Z; c9 V# j8 GA real sample to review lecture 6
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- [, t/ g* J+ s; W6 D; _6 N' ?, L5 I5 ^Introduction Roughness
Quick check hole size and position
Introduction O-ring groove
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) C' d0 K, d1 ^' I! U2 _& ]3 \. [0 xSurface roughness
3 @* n; P! o7 t•        Imperial Unit: micro-inch 10-6 inch
! A* B6 c4 M. D2 t" J- ?•        Metric Unit: micrometer 10-6 m
•        Sample 250 micro-inch = 6.3 micrometer
4 ?8 `. P& l. k: K(250X25.4X10-3)
3 O& ?" J8 D- N6 ]7 |5 C•        250 micro-inch – forging surface
•        125 rough machine, 32 fine machine
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) G/ A' z+ d# T+ g4 eInch size O-ring
•        O-ring number 232
& k. R3 Z& \3 e•        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
. z3 u. n' H/ O8 |7 W8 i; T" V•        One of OD or ID is close standard size
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& C& Y# Q& B9 ]/ u! N/ b8 c1 u1 Ihttp://www.newmaple.com/forumdisplay.php?fid=28