If the relation between the center of the hole and the center of the eye lid pins is critical, why then is there some part number connectors in which the eye lid pin does not protrude through the PTH to the other side of the board. How does one inspect/examine for compliance?
Victor,
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Tan Geok Ang
Sent: Monday, September 29, 2014 10:12 PM
To: [log in to unmask]
Subject: Re: [TN] FW: [TN] DIMM Socket press-fit Misalignment
There are tolerances in PTH drill positions, holes size, connector pins alignment, etc. I am not surprised with the alignment in the picture. Can't really see there are pins protrusion to the bottom side of the board. The "eye" of the pin v.s. hole dimension is very important.
________________________________________
From: TechNet [[log in to unmask]] on behalf of Wayne Thayer [[log in to unmask]]
Sent: Monday, 29 September, 2014 7:36:47 PM
To: [log in to unmask]
Subject: Re: [TN] FW: [TN] DIMM Socket press-fit Misalignment
Lyon-
The pictures do not look good--the defect cited is a "process indicator", and demands closer inspection. I am not aware of any IPC standards applicable in this case because analyzing press-fit from a visual perspective(or any non-destructive technique) is too limiting.
The press fitting process assures that all pins end up exactly centered in the holes because the point is supposed to be in the middle, and the sides of the pin are supposed to collapse evenly. If the pin is off center, there are very high corrective forces induced which push it back on center.
Examine the pins before pressing and make sure the splitting process was done correctly. Measure the insertion/extraction force on a single pin and verify you are within the stated range. Carefully measure the hole diameter and make sure it is within the press-fit manufacturer's specifications.
The most likely scenario is that the holes are too big, so the pins are barely scraping as inserted. If that's the case, you should be able to pull off the entire connector without much effort. The pins need to be considerably deformed as they swage into the through-hole plating.
Wayne Thayer
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Victor Hernandez
Sent: Wednesday, September 24, 2014 1:34 PM
To: [log in to unmask]
Subject: Re: [TN] FW: [TN] DIMM Socket press-fit Misalignment
To my understanding there is no correlation between the centering of the Press Fit Pin on the exit PTH versus the location of the contact wipe pin.
Victor,
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: Wednesday, September 24, 2014 8:56 AM
To: [log in to unmask]
Subject: Re: [TN] FW: [TN] DIMM Socket press-fit Misaiming
Hi Lyon!
Your picture is posted. The link is here:
http://stevezeva.homestead.com/DIMM_Pins.jpg
Steve
On Wed, Sep 24, 2014 at 7:29 AM, Lyon Yuan wrote:
> Hi Steve,
>
> Please help to post picture.
>
> Lyon Yuan
>
> -----Original Message-----
> From: [log in to unmask] [mailto:[log in to unmask]] On Behalf
> Of Louis Hart
> Sent: Wednesday, September 24, 2014 8:53 PM
> To: [log in to unmask]
> Subject: Re: [TN] DIMM Socket press-fit Misaiming
>
> Lyon, TechNet had a place to put pictures at one time. I used it. But
> now, I do not see on the IPC a mechanism for posting pictures for all
> to see.
>
> People have been using Steve Gregory's 'service', as you may have noticed.
> But the IPC depository was a place TechNetters could use directly.
> Has something changed at IPC so we can no longer post pictures?????
> Louis Hart
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Lyon
> Sent: Wednesday, September 24, 2014 7:34 AM
> To: [log in to unmask]
> Subject: Re: [TN] DIMM Socket press-fit Misaiming
>
> who should I send picture to ? so you can see it? Lyon Yuan 发自 Android
> 网易邮箱 On 2014-09-24 19:27 , Lyon Wrote: Folks, Recently,Customer
> reported that found a field return unit with DIMM socket press fit pin
> seems misaligned. you can see that some pins at the edge were
> misaligned to one side and potentially caused contact issue. But i see
> all of boards with same misalignment pin in production line.My
> customer question us how do you think this is acceptable? Any IPC
> standand mention it? How did it happen on this misalignment? Lyon Yuan
> 发自 Android 网易邮箱
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