Pat,
I was not being critical of your method, because I'm sure you did your homework and assessed such things as the hull effect or otherwise your repair job could leave a yacht to be desired.
I was just mentioning that many things need to be considered, prior to determining an adhesive for the job.
Dewey
-----Original Message-----
From: [log in to unmask] [mailto:[log in to unmask]]
Sent: Friday, June 21, 2013 9:58 PM
To: Whittaker, Dewey (EHCOE)
Subject: RE: [TN] circuit board repair materials
Dewey,
The method I described below is how I was taught in 1976 in Uncle Sam's Yacht and Canoe Club micro circuit board repair course taught by Pace.
I believe the adhesive of choice then was Armstrong, but Barco Bond is
now what I have provided. I have also used fiberglass resin and fiber
but that is way tooooooo messy for a small repair that may not be structural.
Form, Fit, and Function.
Phil, The other adhesives group that may be worth a look at is Master Bond Adhesives, they make a lot of adhesives for the electronics industry.
pat
On Fri, Jun 21, 2013 at 9:19 AM, Whittaker, Dewey (EHCOE) wrote:
> I don't know you two, but you have my dipoles in a bind just thinking
> about it. I have done a lot of engineering work on the development and
> use of adhesive in the Aerospace Industry. Patents and procedures
> aside, there is a lot of testing and environmental impacts to assess.
> Brian makes good points, as the both of us being old war horses, it
> is an uncomfortable expectation of familiarity with glue factories. If
> this is just filling a void, with no functional expectations then the
> choice is much easier. Any required functional (electrical,
> structural) characteristics demands more Dewey diligence in the choice
> of adhesives. Dewey -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Pat Goodyear
> Sent: Friday, June 21, 2013 8:26 AM
> To: [log in to unmask]
> Subject: Re: [TN] circuit board repair materials
>
> Phil,
>
> I use Barco Bond M-100X as the base, I also will grind up some circuit
> board to add to the adhesive to give the fill some board body if the
> area is large. There is usually some unused portion of the board
> that using a rasp one can obtain enough filler material to do the job
> to add it to adhesive. You can also mill out the area, and using a
> piece of scrap board mill a patch and epoxy it in place. I have done
> it both ways and it depends on the size of the divot.
>
> Pat Goodyear
>
>
> On Fri, Jun 21, 2013 at 6:20 AM, Nutting, Phil wrote:
>
>> Good morning all,
>>
>> This is a question regarding the repair of FR-4 after there has been
>> a high voltage arc/burn. In a recent failure we ground out all the
>> burned material and "repaired" the board with 5 minute epoxy. This
>> is on a pancake connector for a 160kV x-ray tube. I am of the
>> opinion that 5 minute epoxy will soon fail as it does not have the
>> same insulating characteristics as the base FR-4.
>>
>> I see that Circuit Technology carries all sorts of repair
>> materials/kits. So, if you were to salvage a burnt circuit board
>> that had to ship right away, what materials would you use?
>>
>> Off line replies are accepted if you want to protect your sources or
>> don't want to "advertise" on Technet.
>>
>> Thanks in advance for your wealth of information,
>>
>> Phil Nutting | HVP Development Engineer | Excelitas Technologies
>> Corp
>>
>> Office: +1 978.224.4152
>> 35 Congress St, Salem, MA 01970 USA
>> [log in to unmask]<mailto:[log in to unmask]>
>> www.excelitas.com<http://www.excelitas.com/>
>>
>>
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