Killing the protrusion should linearly improve the process.  If you have
cut them to negligible protrusion and still have trouble, then you are
stuck with flux/temperature/time games, or some kind of hot air blow-off
like out of the HASL machine.

Wayne

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge
Sent: Thursday, October 09, 2008 12:31 PM
To: [log in to unmask]
Subject: Re: [TN] Need soldering advice ASAP No II

Also need advice concerning soldering of a 120 pin, three row, right
angle, through hole edge connector. The pitch is 1 mm, and the through
hole copper collar is such, that the space between them is just a
fraction of a millimeter. We tried to use our selective soldering
machine, but whatever we do, the SnPb overbridges all the pins!  I'm not
surprised, because the solder surface tension will not allow the solder
to withdraw pin by pin.
However, such connectors are made and sold plenty of, so they must be
solderable, question is with what. The selective soldering machine's
'wave pot' is 10 mm across and the minimum wave top is 3 mm.  Does it
help to cut the pins so that they are even with the board ?  Today, the
pins protrude
0.3 mms . Anyone who knows nothing?
/Inge
PS. Will send a photo to Dr Gregory.

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