Bev,
Knowing me what do you think? The nobility of the mind as well as the metal can not always be easily washed away (disillusionment/dissolution).
Dewey

-----Original Message-----
From: Bev Christian [mailto:[log in to unmask]] 
Sent: Wednesday, August 15, 2012 5:54 PM
To: 'TechNet E-Mail Forum'; Whittaker, Dewey (EHCOE)
Subject: RE: [TN] gold removal question - to remove or not?

:) Dewey,
Was that intentional?  Wrong use of the word "disillusionment".

Graham,
I agree with Dewey that it is certainly overkill for PTH parts.  For SMT
parts, have you done the math to figure out % Au in a completed SMT joint
with different thicknesses of gold?  

Bev
RIM

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Whittaker, Dewey (EHCOE)
Sent: Wednesday, August 15, 2012 3:44 PM
To: [log in to unmask]
Subject: Re: [TN] gold removal question - to remove or not?

Graham,
OK, we'll consider you a dip until proven otherwise. I hope you are talking
about SMT components? There is a good case for not pre-tinning (sounds more
technical than dip) PTH parts where there is a reasonable expectation of
disillusionment of the gold in your flow solder process.
Dewey 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Graham Collins
Sent: Wednesday, August 15, 2012 12:16 PM
To: [log in to unmask]
Subject: [TN] gold removal question - to remove or not?

Hello Technet

I'm in the midst of a debate about gold removal.  Our policy on component
leads is to double dip tin all gold.  J-STD-001 says I do not have to do it
if there is less than "2.54 μm [100 μin]" of gold, but is it realistic to
operate on that basis?  For example, looking at an Airborne brand connector
I find the spec sheet says that there will be 50 μin gold, minimum. Which is
not totally helpful as it does not tell me maximum.  I'm assuming given the
price of gold that they aren't looking to put a lot more than the minimum
on, but how controllable is the process?  Could we check the thickness once
and assume we are safe?

 

(and as you can tell from my phrasing I'm of the more conservative camp on
this one, still dipping the parts until proven wrong)

 

regards, 
  
Graham Collins 
Halifax Production Engineering 
(902) 873-2000 ext. 6215 

 

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