Nah, I am goofy enough as it is.  Beside, the tanker car I have outside the
office is still 75% full......


Doug Pauls
Principal Materials and Process Engineer
Rockwell Collins

On Wed, Apr 13, 2016 at 3:12 PM, Stadem, Richard D. <
[log in to unmask]> wrote:

> Exactly. Thanks so much Lawrence!
> And you now owe Doug Pauls a 6 pack of Diet Dew for using that two-word
> phrase at the end of your last sentence.
>
> -----Original Message-----
> From: Lawrence Dzaugis [mailto:[log in to unmask]]
> Sent: Wednesday, April 13, 2016 1:51 PM
> To: TechNet E-Mail Forum; Stadem, Richard D.
> Subject: Re: TN] Press Fit Pins guideline, Second Time Around
>
> When using lead HASL the critical dimension is the copper plated hole
> size. This can be held tighter than the finished hole size. The HASL can be
> deformed easily in comparison.
>
>  I have not used lead free HASL for press fit. Immersion Sn and Ag can be
> used, ENIG was common, IBM used organic finishes. You must develop your own
> force profiles for insertion. I have used force controlled presses to arbor
> presses. It depends.
>
> "Stadem, Richard D." <[log in to unmask]> wrote:
> >Sn63 HASL coating is the best finish, provided you are allowed to use it.
> The lead is a lubricant.
> >No matter what the chosen finish is, the most important variable to
> control is the finished hole size after plating and the tolerance.
> >The ability to perform  the proper initial drill consistently and obtain
> the initial hole size within a tight tolerance after drilling
> (repeatability and control over drills), and obtain the final hole size
> after plating varies from PWB fabricator to PWB fabricator. The selection
> of the right fabricator is extremely important for PWBs that will use
> press-fit or compliant-lead connectors.
> >The eyelid should be completely under the top surface of the hole. The
> connector design controls the depth of the eye with respect to the shut
> height of the connector, ie, if fully pressed in such that the insulators
> or connector body are fully seated to the PWB surface, the eye should be at
> least 95% fully into the hole. The ability to obtain that is affected by
> the resistance variable, the amount the pin is allowed to bend upwards
> during insertion, and this is an attribute of the press tooling and press
> setup. The amount of resistance brings into play the finished hole size,
> the surface hole finish, and how the stars line up on the day you decide to
> press them in, and the relationship of the press operator's mother to
> his/her father on the day of conception. So "Godd Luck" with that.
> >Odin
> >
> >-----Original Message-----
> >From: TechNet [mailto:[log in to unmask]] On Behalf Of Mattix, Dwight
> >Sent: Wednesday, April 13, 2016 11:59 AM
> >To: [log in to unmask]
> >Subject: Re: [TN] Press Fit Pins guideline, Second Time Around
> >
> >Realized long time ago, the only way out is to do your own due diligence.
> Good luck with getting funds approved for your own reliability
> demonstration, hole wall deformation x-section analysis and pin to pwb
> insertion/retention force testing.
> >
> >-----Original Message-----
> >From: TechNet [mailto:[log in to unmask]] On Behalf Of Victor Hernandez
> >Sent: Wednesday, April 13, 2016 4:13 AM
> >To: [log in to unmask]
> >Subject: Re: [TN] Press Fit Pins guideline, Second Time Around
> >
> >I feel the pain......    There is not relief in sight.....
> >
> >-----Original Message-----
> >From: TechNet [mailto:[log in to unmask]] On Behalf Of Lum Wee Mei
> >Sent: Tuesday, April 12, 2016 7:26 PM
> >To: [log in to unmask]
> >Subject: Re: [TN] Press Fit Pins guideline, Second Time Around
> >
> >I have been asking the same questions even directly to the press-fit
> manufacturer themselves and there is no conclusive answer. Except to drown
> myself in the piles and piles of information from their website and often
> end up going round and round.
> >
> >To quote from Gerry : " Godd hunting"
> >
> >Regards,
> >~wee mei~
> >________________________________________
> >From: TechNet [[log in to unmask]] on behalf of Gerry Gagnon
> >[[log in to unmask]]
> >Sent: Wednesday, April 13, 2016 1:55 AM
> >To: [log in to unmask]
> >Subject: Re: [TN] Press Fit Pins guideline, Second Time Around
> >
> >Hi Victor,
> >
> >Second time is the charm.
> >
> >Press fit pins are highly engineered and have many specifications
> associated with them.
> >Each press pin manufacturer's design tends to be unique as a lot of them
> are patented.
> >
> >The best answer to your questions is to tell you to find out the specific
> press pin manufacturer's part number for the pin that you are dealing with,
> go to their web site, and get the drawings and specifications for the
> specific pin you want to know about.
> >
> >I think you will be surprised at the level of detail you will receive for
> your questions plus the attributes you have not asked for ....... yet.
> >
> >Good hunting.
> >
> >Gerry
> >
> >________________________________________
> >From: TechNet on behalf of Victor Hernandez
> >Sent: Tuesday, April 12, 2016 11:59 AM
> >To: [log in to unmask]
> >Subject: Re: [TN] Press Fit Pins guideline, Second Time Around
> >
> >Fellow TechNetters:
> >
> >My initial inquiry, 2011, did NOT yield any useful information.
> Therefore, I pose the same question again in hope that additional reader
> will provide comments and/or their experience with Press Fit Pins.
> >I look forward to hear from the readers.
> >
> >What is the acceptable depth of the main eye lid with regards to total
> board thickness? I have seen a variety of depths used.
> >What is the preferred raw board surface finish? Again, I have seen a
> variety.
> >
> >Victor,
> >
> >From: Garcia, Rigo (GSFC-370.0)[ARES CORP]
> >[mailto:[log in to unmask]]
> >Sent: Wednesday, January 27, 2016 11:28 AM
> >To: Hernandez, Victor G
> >Subject: RE: Press Fit Pins guideline
> >
> >Thanks!
> >
> >Rigo
> >
> >"The future belongs to those who believe in the beauty of their dreams"
> >- Eleanor Roosevelt
> >
> >From: [log in to unmask] [mailto:[log in to unmask]]
> >Sent: Wednesday, January 27, 2016 12:21 PM
> >To: Garcia, Rigo (GSFC-370.0)[ARES CORP]
> >Cc: [log in to unmask]
> >Subject: RE: Press Fit Pins guideline
> >
> >Rigo,
> >
> >I did NOT get any concrete guidelines and/or specification for Press Pin
> Fit leads. The specs that are out there are confidential.
> >
> >Victor,
> >
> >-----Original Message-----
> >From: Garcia, Rigo (GSFC-370.0)[ARES CORP]
> >[mailto:[log in to unmask]]
> >Sent: Wednesday, January 27, 2016 11:08 AM
> >To: Hernandez, Victor G
> >Subject: RE: Press Fit Pins guideline
> >
> >Hi Victor,
> >
> >Did you get an answer to your question?
> >
> >I'm interested because we are looking into qualifying press fit
> connectors for flight hardware and don't know of any specs that provide
> requirements for the process.
> >
> >Best regards,
> >
> >Rigo Garcia
> >
> >"The future belongs to those who believe in the beauty of their dreams"
> >- Eleanor Roosevelt
> >
> >-----Original Message-----
> >From: TechNet [mailto:[log in to unmask]] On Behalf Of Victor Hernandez
> >Sent: Monday, January 25, 2016 1:40 PM
> >To: [log in to unmask]
> >Subject: [TN] Press Fit Pins guideline
> >
> >Fellow TechNetters:
> >
> >What is the current IPC guideline/specification for insertion depth of
> Press Fit Pins. I aware that the Press Fit Pins configuration might vary a
> little, just as well as board thickness. What is the acceptance criteria I
> should look for visually and during x-ray imaging.
> >
> >Victor,
> >
> >
> >______________________________________________________________________
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