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Date: | Fri, 17 Aug 2007 12:44:02 -0700 |
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Phil,
I guess the few simplest ideas left that I have are as follows:
* Prep the axial leads with a frog leg bend so the part will be
above the surface after installation prior to soldering
* Prep the part with one frog leg bend and mount the part with
the u-bend if you have height clearance
* Sleeve the body with heat-shrink sleeving prior to
installation
* Dip the body of the part in Type UR Conformal Coat per
IPC-CC-830
There are others, but you seem to have reluctance at doing anything to
the bare printed board.
Dewey
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Craig Cullum
Sent: Friday, August 17, 2007 7:21 AM
To: [log in to unmask]
Subject: Re: [TN] Solder mask as an insulator - illustration posted
Aaaaah. I've experienced something similar in the distant past when
hand-assembling prototypes and such.
The cover (epoxy?) of metal-film through-hole resistors is not as
structurally sound as one would presume.
Craig Cullum, Engineering Technologist, AMTELCO
e: [log in to unmask]
[log in to unmask]
f: 608 838 8367
v: 608 838 4194, or 4197, x128
Please visit us at www.amtelco.com
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Phil Nutting
> Sent: Friday, August 17, 2007 7:15 AM
> To: [log in to unmask]
> Subject: Re: [TN] Solder mask as an insulator - illustration posted
>
> Good Morning folks,
>
> I created a graphic to illustrate our "punch through" problem
> as I don't have any photographs of the failed board/part.
>
> Steve Gregory has posted the illustration at
> http://stevezeva.homestead.com/files/LPI_punch_thru.jpg.
> Thanks Steve.
>
> Phil
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