That works too. 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Goodyear, Patrick
Sent: Tuesday, May 07, 2013 11:16 AM
To: [log in to unmask]
Subject: Re: [TN] How to Tin (remove gold from) Solder cups

Gregg,

What about vacuum extraction?  Is that also effective, since that is the
method I was taught 38 years ago in Uncle Sam's Canoe Club?  

Pat Goodyear

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Gregg Owens
Sent: Friday, May 03, 2013 10:04 AM
To: [log in to unmask]
Subject: Re: [TN] How to Tin (remove gold from) Solder cups

Ben:

As to 1) really small pre-fluxed but untinned wires can be used to  remove
the solder after it is inserted into the cup and heated. Capillary action
will remove gold. Also solder wick can be used but off the top of my head I
don't know how small it is available.  2) double-tinning just means
technician adds solder to completely fill the cup. Then remove the solder
via wire or solder wick. Repeat process second time. Then you are ready to
fill the solder cup with solder (a third time) for final soldering
operations to solder wire to cup. 

Hope this clarifies. 

Gregg Owens

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Gumpert, Ben
Sent: Friday, May 03, 2013 8:31 AM
To: [log in to unmask]
Subject: [TN] How to Tin (remove gold from) Solder cups

Technetters,

It looks like from the archives that we all agree that removing the gold
from solder cups is necessary to get a good joint. So that leaves me with a
couple of questions:

1. Does anyone have some recommendations on a good method to ensure adequate
gold removal, especially on really small cups? Is adding solder and then
removing it with a solder wick the standard method?

2. What does a double-tinning method really mean (i.e. what do I need to do
to meet the requirement of J-STD-001E Para. 4.5.1?)

A single tinning process would be to fill the cup with solder wire and then
reflow that solder to 'tin' the cup, followed by the installation of a wire.
So does a double tinning just mean that the solder is removed ONCE and the
cup tinned a second time with the solder that will be used to create the
final joint? I have had some people tell me that the solder had to be
removed TWICE to be considered 'double-tinning'. (Of course the main goal
should be to get rid of the gold and the process should be based on
achieving that goal, but that may be a different discussion.)

Ben

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