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Date: | Fri, 07 Feb 1997 07:28:50 -0600 |
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First of all I stay with the "Class 3 Military" , internal .002, external .004.
What you need to know is, what size tool is my vendor using to achive
the called out finished hole size?
For a plated through hole:
MAX. ACCEPTABLE HOLE DIA. +.003" = (MAX TOOL SIZE)
MIN. ACCEPTABLE HOLE DIA. +.008 = (MIN. TOOL SIZE)
EX: PTH .028" +/- .003" (MAX. TOOL = .034") (MIN. TOOL = .033")
Now I need a list of avable tool sizes from my vendor(s) and a find the
max. tool that they would/could use. (.033") and plug that into this
formula:
Min. Pad = (AR + .005") x 2 + Drill Size
EX: .002" AR = (.002" + .005") x 2 + .033" = .047" PAD
Clear as mud?
Dan Lorinser
BFGoodrich Aerospace
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