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Vias

Vias

2009-09-02 by blue_eagle74

I cant find it, but someone talked about using componet lead, resistor maybe, for vias and soldering each side to make for a low profile via. I have tried this and didn't get good results.

Something like insert the lead and solder it on one side and snip if off on the other side and solder it. I did this and got larger solder deposits than using flat trace repair copper strips.

Is there any other clever ideas for vias? My target chip is the QFP.
Making plated through hole is too complated right now.

Brian

Re: [Homebrew_PCBs] Vias

2009-09-02 by Piers Goodhew

Around May 11 there was a thread "via's using homemade boards" - I  
think the apostrophe might have thrown your searches off. There was  
this post:


	From: 	derekhawkins <eldata@...>
	Subject: 	[Homebrew_PCBs] Re: via's using homemade boards.

 > What have you used that works, besides through hole plating?

Pressed fit header pins work best, especially for hidden vias. For the  
latter, you need to use flux on the tip of the pins after they are  
pressed flush with the board beneath where the component will go.

Cut the pin at the other side, it's the chamfered geometry of the  
uncut tip of the pin that allows a good joint with so little exposed  
solder. Also, because these pins are square and the hole is round,  
solder will wick below the board's surface which tends to reinforce  
the joint.

http://www.pbase.com/eldata/image/65408722
http://www.pbase.com/eldata/image/65448015



HTH
PG
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On 02/09/2009, at 1:39 PM, blue_eagle74 wrote:

> I cant find it, but someone talked about using componet lead,  
> resistor maybe, for vias and soldering each side to make for a low  
> profile via. I have tried this and didn't get good results.
>
> Something like insert the lead and solder it on one side and snip if  
> off on the other side and solder it. I did this and got larger  
> solder deposits than using flat trace repair copper strips.
>
> Is there any other clever ideas for vias? My target chip is the QFP.
> Making plated through hole is too complated right now.
>
> Brian
>
>

Re: [Homebrew_PCBs] Vias

2009-09-02 by Tolga Abaci

You might also want to try something like this:
http://retromaster.wordpress.com/2009/08/18/the-pcb-via-press/
Show quoted textHide quoted text
On Wed, Sep 2, 2009 at 6:50 AM, Piers Goodhew<piers@...> wrote:
> Around May 11 there was a thread "via's using homemade boards" - I
> think the apostrophe might have thrown your searches off. There was
> this post:
>
>
>        From:   derekhawkins <eldata@...>
>        Subject:        [Homebrew_PCBs] Re: via's using homemade boards.
>
>  > What have you used that works, besides through hole plating?
>
> Pressed fit header pins work best, especially for hidden vias. For the
> latter, you need to use flux on the tip of the pins after they are
> pressed flush with the board beneath where the component will go.
>
> Cut the pin at the other side, it's the chamfered geometry of the
> uncut tip of the pin that allows a good joint with so little exposed
> solder. Also, because these pins are square and the hole is round,
> solder will wick below the board's surface which tends to reinforce
> the joint.
>
> http://www.pbase.com/eldata/image/65408722
> http://www.pbase.com/eldata/image/65448015
>
>
>
> HTH
> PG
>
>
> On 02/09/2009, at 1:39 PM, blue_eagle74 wrote:
>
>> I cant find it, but someone talked about using componet lead,
>> resistor maybe, for vias and soldering each side to make for a low
>> profile via. I have tried this and didn't get good results.
>>
>> Something like insert the lead and solder it on one side and snip if
>> off on the other side and solder it. I did this and got larger
>> solder deposits than using flat trace repair copper strips.
>>
>> Is there any other clever ideas for vias? My target chip is the QFP.
>> Making plated through hole is too complated right now.
>>
>> Brian
>>
>>
>
>
>
> ------------------------------------
>
> Be sure to visit the group home and check for new Links, Files, and Photos:
> http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links
>
>
>
>

Re: [Homebrew_PCBs] Vias

2009-09-02 by Stefan Trethan

I think you would be asking for reliability problems in the long run
with riveted vias like this.
I already cringe at the thought of flush-soldering press fit header
pins, but this one I really wouldn't want to risk.

ST
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On Wed, Sep 2, 2009 at 7:49 AM, Tolga Abaci<tolga.abaci@...> wrote:
> You might also want to try something like this:
> http://retromaster.wordpress.com/2009/08/18/the-pcb-via-press/
>

Re: [Homebrew_PCBs] Vias

2009-09-02 by Erik Knise

If i ever tried riveting them, I'd try to add a small touch of solder
on each side...not on top, just around the sides to create a little
fillet.

On Wed, Sep 2, 2009 at 10:26 AM, Stefan Trethan<stefan_trethan@...> wrote:
> I think you would be asking for reliability problems in the long run
> with riveted vias like this.
> I already cringe at the thought of flush-soldering press fit header
> pins, but this one I really wouldn't want to risk.
>
> ST
>
> On Wed, Sep 2, 2009 at 7:49 AM, Tolga Abaci<tolga.abaci@...> wrote:
>> You might also want to try something like this:
>> http://retromaster.wordpress.com/2009/08/18/the-pcb-via-press/
>>
>
>
> ------------------------------------
>
> Be sure to visit the group home and check for new Links, Files, and Photos:
> http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links
>
>
>
>



-- 
Erik L. Knise
Pacific Shipping Company
Seattle, WA

Re: [Homebrew_PCBs] Vias

2009-09-02 by leon Heller

----- Original Message -----
Show quoted textHide quoted text
From: "Stefan Trethan" <stefan_trethan@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Wednesday, September 02, 2009 6:26 PM
Subject: Re: [Homebrew_PCBs] Vias


>I think you would be asking for reliability problems in the long run
> with riveted vias like this.
> I already cringe at the thought of flush-soldering press fit header
> pins, but this one I really wouldn't want to risk.

PCB eyelets were very popular 40 years ago before through-hole plating 
became commonplace, and were reliable enough. When  I worked for Rank-Xerox 
they were used on all the PCBs in the copiers we made.

Leon

Re: [Homebrew_PCBs] Vias

2009-09-03 by Tolga Abaci

I realize that reliability problems are a possibility. But even if
that were the case, I think this is a quite valuable technique for
some quick prototyping. Personally, I find it more practical (and
safer, in terms of accidentally ruining the pcb) than soldering tiny
via holes.

Without proper and thorough testing of this one specific technique
though, claiming that one "asks for" long run reliability problems
does not really go beyond speculation now, does it? In any case, one
might be better off leaving the job to professionals if long run
reliability is a big concern. Just my personal opinion...

-Tolga
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On Thu, Sep 3, 2009 at 1:02 AM, leon Heller<leon355@btinternet.com> wrote:
>
>
> ----- Original Message -----
> From: "Stefan Trethan" <stefan_trethan@...>
> To: <Homebrew_PCBs@yahoogroups.com>
> Sent: Wednesday, September 02, 2009 6:26 PM
> Subject: Re: [Homebrew_PCBs] Vias
>
>>I think you would be asking for reliability problems in the long run
>> with riveted vias like this.
>> I already cringe at the thought of flush-soldering press fit header
>> pins, but this one I really wouldn't want to risk.
>
> PCB eyelets were very popular 40 years ago before through-hole plating
> became commonplace, and were reliable enough. When I worked for Rank-Xerox
> they were used on all the PCBs in the copiers we made.
>
> Leon
>
>

Re: [Homebrew_PCBs] Vias

2009-09-03 by Stefan Trethan

Tek used them too, and there were reliability problems.

Also, it's comparing a product that is designed to do the job applied
with a suitable press to a piece of wire jammed in there. A lot more
variables.

I wouldn't do it personally.

ST
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On Thu, Sep 3, 2009 at 12:02 AM, leon Heller<leon355@btinternet.com> wrote:

> PCB eyelets were very popular 40 years ago before through-hole plating
> became commonplace, and were reliable enough. When  I worked for Rank-Xerox
> they were used on all the PCBs in the copiers we made.
>
> Leon
>

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