(desperately hoping people can get off their myriad of little hobby horse
discussions and back to technical info...)
Thanks for the suggestions last week. We are exploring some of the options
given. Other suggestions are still welcome. For the immediate future, it
is looking like lengthening the wire another 1/2" is helping reduce the
strain and breakage.
Regards,
Genny.
> -----Original Message-----
> From: Genny Gibbard [SMTP:[log in to unmask]]
> Sent: Friday, April 11, 2003 1:21 PM
> To: [log in to unmask]
> Subject: [TN] wire assembly suggestions
>
> We have a midplane made of four interconnecting boards, involving time
> consuming detailed hand assembly to put together. Part of the interface
> of this board to other parts of the system is a terminal housing of 12
> wires, 7 going to one midplane board and 5 going to another. The wires
> are about 2" long, soldered on the PCB end, crimp terminals on the housing
> end. Originally a 26 ga ribbon cable piece was used, but they wanted
> higher current carrying capability, so went to a 22ga ribbon cable. The
> ribbon cable is so stiff, that one prototype assembler suggested going to
> 24ga teflon coated stranded wire. The first few prototypes went fine and
> have exhibited no problems, but then it moved into production to finish
> off the proto build and give them experience with the assembly. Now it
> seems like on every assembly they are complaining some of the wires from
> the terminal housing are breaking off at the PCB.
> The terminal housing sits very close to the midplane assembly, once
> mounted in the chassis, and there is very little positional movement once
> it is installed in the product chassis. The wires are probably longer
> than we need, but you need some length to ease the handling of assembling
> this. The wires go in sort of a J shape, straight out of the terminal
> housing and then curving down or up and back to the vias on the PCB's.
> They were shown how the wires were preformed and routed off the boards to
> the terminal housing to limit the wiggling and strain they would go thru
> once they were soldered to the boards, and they say they've done that, but
> that they are still breaking. They INSIST we find another solution.
>
> Suggestions?
>
> Genny Gibbard ( <mailto:[log in to unmask]>)
>
>
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