Stuart,
        That all depends on how well equipped your fab house is.  Some
     facilities are equipped with machinery that can accommodate hundreds
     of sizes in their tool magazines and controller software.  Some shops
     use machinery that can handle 9 or less tools at a time.  If I
     remember correctly from design 101, the specs for typical leaded
     components have quite a wide range for finished hole diameter that
     assembly operations can accommodate.  If keeping your tool quantities
     down has to be a consideration, you can try to take advantage of these
     ranges when you set up your hole/pad stacks in the CAD library.  (Or
     just eliminate leaded components, ha!)

     Mike Mikucki


______________________________ Reply Separator _________________________________
Subject: [TN] Increase number of drill sizes
Author:  Stuart Chessen <[log in to unmask]> at
SMTPLink-Hadco
Date:    9/26/98 6:51 AM


     Over the past year we have upgraded our CAD library. Each component
     has it own pad and/or hole size in the library. I have noticed this
     has doubled the number of different drills needed compared with
     previous boards layout in years past . Some of the drills sizes only
     vary by .003".

     What problems is this causing for the board fab house?

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