Ryan,
     We are currently using the light pipes on several assemblies. They do
not fit especially tight. We do heat stake them using metal shim stock
underneath the board. This is slightly easier than placing, clinching, and
waving; and saves one less "thermal cycle" to the board.
                                                        Regards,
                                                        Michael Sanders



                    Ryan Jennens
                    <jennens@TELG        To:     [log in to unmask]
                    EN.COM>              cc:
                    Sent by:             Subject:     [TN] LED light pipes
                    TechNet
                    <[log in to unmask]
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                    04/28/2000
                    10:37 AM
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                    Ryan Jennens






Hey all-

        Engineering has come up with the idea of replacing some bi-level
LEDs with
smt LEDs and attaching light pipes.  These Dialight light pipes "press-fit"
into drilled holes in the board.  I am not sure if we are trading one
process step for another.
        We currently selectively wave solder the pth LEDs, but there are
some
resistor networks making the pallet openings a little hairy...but it is
feasible as they are.
        My question is:  how tight do these light pipes press in?  Is
anybody else
doing this?  Do I need to heat-stake these things?  If so, it doesn't sound
like any advantage from a manufacturing point of view.  If not, is it
easier
to press these in than place pth parts, clinch and wave?
        I am not completely sold on this idea.  Thanks all.

-Ryan Jennens
TelGen Corporation
(517) 887-6666 x151

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