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July 1998

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Subject:
From:
Eldon Sanders <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 30 Jul 1998 10:58:33 -0700
Content-Type:
text/plain
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text/plain (63 lines)
You also have to add the accuracy of your board shop scoring machine
(position and depth), and the artwork registration to your equation.
This could add 8 or more thousandth's to the 12 you started with.  I use
worst case for clearance to a scored edge (not rss) to make sure no
copper is exposed.

Regards,


> -----Original Message-----
> From: [log in to unmask] [SMTP:[log in to unmask]]
> Sent: Thursday, July 30, 1998 9:42 AM
> To:   [log in to unmask]
> Subject:      [TN] Scoring
>
>      I am looking for input as to what others use as a rule for
> cutting
>      back copper on artworks, to avoid being cut during the v-score
>      operation. It seems that whatever I use, no matter how many times
> I
>      double-check my numbers, we still occasionally get copper being
>      exposed during scoring. If there is a better way than I a using,
> it
>      would be appreciated. I am currently using a formula of the depth
> of
>      the score ( not the web ) multiplied by the tangent of the given
>      angle. Ex : a depth of .021 X 30 degree tangent (,5774) tells me
> to
>      make sure that we are clear at least .012 from the edge of the
> board.
>      If I'm calculating wrong, please let me know.
>
>                                  Thanks
>
>                                  Ernie Smith    [log in to unmask]
>
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