Re: gEDA-user: Trouble with 1.1 mil pin holes for potentiometer

["Rob Butts" <r.butts2@xxxxxxxxx>]

   Thanks DJ
   On Tue, Sep 30, 2008 at 6:11 PM, DJ Delorie <[1]dj@xxxxxxxxxxx> wrote:

     You need a 1.1mm (43 mil) hole for the three signal pins, on 2.5mm
     (98
     mil) centers.  That leaves 55 mil between drills, you can have 20
     mil
     annulus (43+20+20 = 83 mil "size") with 15 mil space between them.
     The pin itself is only 0.8mm (32 mil) so you can probably get away
     with a 35 mil drill if you want - the extra "official" size allows
     for
     hole plating and wave soldering.
     Minimum space and clearance depends on the accuracy of your
     process; I
     can do 8 mil with toner transfer and 5 mil with photomask, you
     might
     want to stick with 10 or more mil until you're more comfortable
     with
     your process.
     For the two mounting pins, set the drill size big enough to fit the
     pins through, and the copper size 40 mil bigger (20 mil annulus).
     Set the mask to anything, you won't be using it anyway.  Or set it
     to
     be 6 mil bigger than the copper size, this is what most fabs want
     anyway.
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References

   1. mailto:dj@xxxxxxxxxxx
   2. mailto:geda-user@xxxxxxxxxxxxxx
   3. http://www.seul.org/cgi-bin/mailman/listinfo/geda-user


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