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, > > > > > >______________________________________________________________________ > >This email has been scanned by the Symantec Email Security.cloud service. > >For more information please contact helpdesk at x2960 or > >[log in to unmask] > >______________________________________________________________________ > > > >______________________________________________________________________ > >This email has been scanned by the Symantec Email Security.cloud service. > >For more information please contact helpdesk at x2960 or > >[log in to unmask] > >______________________________________________________________________ > > > >______________________________________________________________________ > >This email has been scanned by the Symantec Email Security.cloud service. > >For more information please contact helpdesk at x2960 or > >[log in to unmask] > >______________________________________________________________________ > > > >______________________________________________________________________ > >This email has been scanned by the Symantec Email Security.cloud service. > >For more information please contact helpdesk at x2960 or > >[log in to unmask] > >______________________________________________________________________ > > > >______________________________________________________________________ > >This email has been scanned by the Symantec Email Security.cloud service. > >For more information please contact helpdesk at x2960 or > >[log in to unmask] > >______________________________________________________________________ > > > >______________________________________________________________________ > >This email has been scanned by the Symantec Email Security.cloud service. > >For more information please contact helpdesk at x2960 or > >[log in to unmask] > >______________________________________________________________________ > > > >______________________________________________________________________ > >This email has been scanned by the Symantec Email Security.cloud service. > >For more information please contact helpdesk at x2960 or > >[log in to unmask] > >______________________________________________________________________ > > ______________________________________________________________________ > This email has been scanned by the Symantec Email Security.cloud service. > For more information please contact helpdesk at x2960 or [log in to unmask] > ______________________________________________________________________ > ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. 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