Hey all-

    We use selective wave solder pallets extensively to solder through-hole
leads, as almost all our boards are mixed tech.  A couple types boards
consistently show a single short on the trailing edge of large through-hole
connectors.  One board always shorts on the trailing pins of a PGA socket,
while the other always shorts on the trailing edge of a 40-pin dual-row
female header.  No amount of tweaking the wave machine settings affects the
short.  My theory is this:  When the solder leaves the larger pallet
openings, it has nothing to "snap" to.  Therefore, it "snaps" to the last
couple of pins it leaves.  I have made sure that the solder flows off the
back of the wave at the same speed as the conveyer.  Has anybody else seen,
or heard, of this problem with selective solder pallets?  The advantages of
reflowing bottom-side components make wave soldering the whole bottom-side
unfeasible.  Speaking with the pallet house has left us with grooved pallet
bottoms and chamfered openings; but the problem remains.  Is there a way to
alter the selective wave solder pallet openings to avoid these "snap-back"
shorts?