Hi Graham,
        I can't speak from experience, but we have some plaques in our
hallway bragging that our engineers hold the patent on the idea.  Apparently
it does work.  Now we use selective solder pallets, and most boards we build
are too big to rotate anyway.  So I can't tell you first hand that it works.

Ryan G.

> -----Original Message-----
> From: Collins, Graham [SMTP:[log in to unmask]]
> Sent: Thursday, January 27, 2000 10:45 AM
> To:   [log in to unmask]
> Subject:      [TN] wave soldering - board rotation
>
> Is the TechNet back up?  Yippee!
>
> Good day TechNet!
> Has anyone out in wave soldering land tried using a wave soldering fixture
> that allows you to change the rotation of the board so that the edge of
> the
> board isn't parallel to the conveyor?
>
> I'm told that rotating the board slightly (say 5 degrees - not 90
> degrees!)
> can reduce the
> occurrence of solder skips on SMT chips (caps and resistors).  Any
> experience out there to confirm or deny this?
>
> Final note: the board design is not suitable for a paste reflow of the SMT
> parts followed by use of a partial wave fixture.  Otherwise that would be
> my
> #1 choice...
>
> regards,
>
> Graham Collins
> Process Engineer,
> Litton Systems Canada, Atlantic Facility
> (902) 873-2000 ext 6215
>
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