Genny:
        Use a connector instead of soldering the wires to the board. The
connectors will take the stress off the cable.
        Regards,
        Ramon

> -----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]>)
>
>
> ---------------------------------------------------
> Technet Mail List provided as a free service by IPC using LISTSERV 1.8e
> To unsubscribe, send a message to [log in to unmask] with following text in
> the BODY (NOT the subject field): SIGNOFF Technet
> To temporarily halt or (re-start) delivery of Technet send e-mail to
> [log in to unmask]: SET Technet NOMAIL or (MAIL)
> To receive ONE mailing per day of all the posts: send e-mail to
> [log in to unmask]: SET Technet Digest
> Search the archives of previous posts at: http://listserv.ipc.org/archives
> Please visit IPC web site http://www.ipc.org/html/forum.htm for additional
> information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700
> ext.5315
> -----------------------------------------------------
>

---------------------------------------------------
Technet Mail List provided as a free service by IPC using LISTSERV 1.8e
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/html/forum.htm for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
-----------------------------------------------------