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发表于 2007-12-3 12:38
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[V] AutoCAD 实战讲座第七讲' Q/ Z; Y, ? f6 v/ O! F: N2 a
AutoCAD 实战讲座第七讲1 n' i/ d' B. q; l# S# s8 j( Y
New Maple AutoCAD (7)
& s j1 c6 H- s0 }! A1 X8 vwww.newmaple.com/video/autocad0007, ^/ Q- A* T2 }; v8 [
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A real sample to review lecture 6
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Introduction Roughness
* D) P- F7 P5 n5 g5 a/ lQuick check hole size and position
2 q/ C2 k) f/ r7 A6 ]* C7 a; tIntroduction O-ring groove5 t7 ^# e# Z$ U4 ^! X* W9 j
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Surface roughness
6 R% Z4 l+ E- x% A: ^• Imperial Unit: micro-inch 10-6 inch4 t# _3 |8 R2 c! Y" F% Q
• Metric Unit: micrometer 10-6 m" j0 \3 W6 U( s: n' u N
• Sample 250 micro-inch = 6.3 micrometer) o! A0 G& N' B: r6 f6 ?
(250X25.4X10-3)' u$ B* R) M, e1 x" R9 X+ ]# m7 h
• 250 micro-inch – forging surface; a; x: a$ d" O d/ i$ y1 q. l0 ~
• 125 rough machine, 32 fine machine. Z' m" b3 V/ _+ G4 n- V
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Inch size O-ring
/ g8 U& ?3 E/ I• O-ring number 232
* S1 _4 ^" u7 C* v. `* x• nominal size 2.75”x3”x1/8”9 H' B8 i! i7 ?7 \. e
• Actual size 2.734”x3.012”x0.139”9 R3 D! M1 j7 h
• Static surface seal groove depth 0.101~0.107 about 25% squeeze9 v8 D0 m- k& T+ g0 ]/ V; z! Y
• One of OD or ID is close standard size, o% ~6 \5 J/ O3 G h4 c
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