Re-drilling of the affected holes can be done reliably by most PCB
fabricators. If you would like more information please contact me.
Regards,
James Hofer
Director of Operations
Accurate Circuit Engineering
3019 S. Kilson Dr.
Santa Ana Ca. 92707-4202
714-546-2162 work
714-473-6127 cell
[log in to unmask]
----- Original Message -----
From: "Ed Popielarski" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Tuesday, August 10, 2004 8:47 PM
Subject: Re: [TN] Removing solder from PTH barrels
> Cheryl,
>
> Are you trying to remove fused solder or solder paste from the barrels?
>
> If fused, I caution an attempt to remove "all" of the solder, as the
> remaining Cu base metal might not be compatible with the press pins.
Removal
> of excess solder would easily be accomplished with a hot air method. Total
> removal of the solder would most likely require drilling to remove the
> intermetalic layer (Sn,Pb,Cu alloy) which can be accomplished with a "bomb
> site" drill. Time consuming and somewhat risky, but it can be done.
>
> If it's solder paste in the hole, most likely it could be washed out, and
> should, since the flux remaining in the interface can cause serious
problems
> down the road. Wiping the surface can compact the spheres into the hole
and
> make washing impractical, so an adequate cleaning process must be
utilized.
>
> Austin American Technologies makes an outstanding system for cleaning
> misprint boards and stencils called the "X-Cleaner". Please feel free to
> contact me offline to discuss this further if you like.
>
> Regards,
>
> Ed Popielarski
> QTA Machine
> 27291 Jardines
> Mission Viejo, Ca. 92692
>
> Phone:949-581-6601
> Fax: 949-218-7829 <------NEW!
> WWW.QTA.NET
>
> Be true to your work, your word, and your friends.
> Henry David Thoreau
>
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