Todd, there is certainly an amphoric edge on scored product after it has been de-paneled.
More when de-paneled manually than by de-panelers (like the pizza cutter style) but .010" is over the
top.  Many people have trouble with the actual scored position vs. the edge of the blade.  on a 30 deg.
blade for example, this edge can encroach into the part as much as .015" depending on blade condition.
Typically its closer to .008".

As HGross indicated the info you need is currently at Accusystemscorp.com (H,  you had the old address.)
this will include what growth to expect when breaking scored product.

As far as positioning accuracy is concerned, any modern cnc machine should hold
a tolerance of +/- .002"  or better.

some day soon my vscore site will be up and running with more data available.  For now the FAQs at the
above site will probably help volumes.

hope this helps,   Mark Simmons, Vscore Central, Inc.




Todd Vorpahl wrote:

> Not sure what you meant by "bad cpk" but we saw .010" variance along a scored
> edge when looking under a microscope.  We reverted to routing out all critical
> edges and routing the rest of the edge.
>
> Todd
>
>  (Embedded
>  image moved   Lee PengSoon-CPL035
>  to file:      <[log in to unmask]>
>  pic20890.pcx) 04/21/99 06:58 PM
>
> Please respond to "TechNet E-Mail Forum." <[log in to unmask]>; Please respond to
>       Lee PengSoon-CPL035 <[log in to unmask]>
>
> To:   [log in to unmask]
> cc:    (bcc: Todd Vorpahl/DIL/Teradyne)
> Subject:  [TN] PCB Scoreline (V cut) tolerance
>
> Note: Some recipients have been dropped due to syntax errors.
> Please refer to the "$AdditionalHeaders" item for the complete headers.
>
> Hi all,
> We are have problem on oversize pcb width due to the bad cpk of the v-cut
> location.
> what is the v-cut tolerance should be set so that it is 6 sigma achieveable?
> Any industrial standard??
>
> Regards,
> Lee
>
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