Hey Steve,

I noticed the comps in your picture have no ID.
Do you remove them in the PICTURE, or do you
do modify them for REAL?

just curious,
Jack
.



On 1/8/07, Steve Gregory <[log in to unmask]> wrote:
>
> Hi Scott!
>
> We build a board that's a rigid-flex and has two small boards aside from
> the main assembly that we separate. Take a look at:
>
> http://stevezeva.homestead.com/files/Rigid_Flex.jpg
>
> The two small boards along the bottom edge are removed along with the
> main assembly after everything is built. We don't snap them out though,
> we actually use a "nibbler" from Fancourt. Basically a hook shaped blade
> that comes down and shears the tabs that holds everything in the panel.
> This panel also has perforated tabs and I think that's a good thing.
> Polyimide is very brittle as you probably know, and the drilled
> perforations keep most all of the cracks that occur during singulation
> from penetrating inwards towards the PCB.
>
> -Steve Gregory-
>
> -----Original Message-----
> From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of
> Scott Riley
> Sent: Monday, January 08, 2007 10:31 AM
> To: [log in to unmask]
> Subject: [DC] Rigid flex "snap off"
>
> I've got a 6 layer rigid flex design with the rigid portions being on
> each end and two flex layers joining them (picture a barbell).  The
> customer wants an additional board attached to one of the rigid portions
> that will be "snapped off" at a later time. There is no circuitry
> running between these two pieces.
>
>
>
> I'm not sure how well the polyimide that is sandwiched between the FR4
> is going to "snap off".  I told the customer that it is made to flex and
> will most likely remain connected. I'm thinking about making perforated
> breakaway tabs, but think the flex material may still need to be cut
> somehow.  The boards would be assembled prior to separation.
>
>
>
> Does anyone have any experience with something like this ?  This is for
> development and would not be used in production, quantities would be
> very small.
>
>
> ------------------------------------------------------------------------
> ---------
> DesignerCouncil Mail List provided as a free service by IPC using
> LISTSERV 1.8d To unsubscribe, send a message to [log in to unmask] with
> following text in the BODY (NOT the subject field): SIGNOFF
> DesignerCouncil.
> To temporarily stop/(restart) delivery of DesignerCouncil send: SET
> DesignerCouncil NOMAIL/(MAIL) Search previous postings at: www.ipc.org >
> On-Line Resources & Databases > E-mail Archives Please visit IPC web
> site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional
> information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100
> ext.2815
> ------------------------------------------------------------------------
> ---------
>
>
> ---------------------------------------------------------------------------------
> DesignerCouncil Mail List provided as a free service by IPC using LISTSERV
> 1.8d
> To unsubscribe, send a message to [log in to unmask] with following text in
> the BODY (NOT the subject field): SIGNOFF DesignerCouncil.
> To temporarily stop/(restart) delivery of DesignerCouncil send: SET
> DesignerCouncil NOMAIL/(MAIL)
> Search previous postings at: www.ipc.org > On-Line Resources & Databases >
> E-mail Archives
> Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16for additional information, or contact Keach Sasamori at
> [log in to unmask] or 847-615-7100 ext.2815
>
> ---------------------------------------------------------------------------------
>

---------------------------------------------------------------------------------
DesignerCouncil Mail List provided as a free service by IPC using LISTSERV 1.8d
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF DesignerCouncil.
To temporarily stop/(restart) delivery of DesignerCouncil send: SET DesignerCouncil NOMAIL/(MAIL)
Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
---------------------------------------------------------------------------------