From:	SMTP%"[log in to unmask]" 20-JAN-1997 14:39:29.66
To:	GLENNH
CC:	
Subj:	Breakaway holes

>>[log in to unmask] said:
>
>
>We have found that we can get alot closer with traces to the edge of a
>breakway if we use v-Scoring instead of breakaway holes.  I have done
>designs that are in production on CEM-1, CEM-3, and FR-4 that have the
>outside edge of the trace at 0.025" away from the edge of the board.
>Quantities on these designs range from several hundred per month to over 1
>million a month.  The size of the panels varies from 1 inch sqaure (the
>miilion a month on CEM-1) to 12 inches by 8 inches (the several hundred a
>month on FR-4).
>
Just a word of warning.  We have found that the distance from edge of
v-score line to edge of trace is dependent upon the board thickness, material
movement, etc. so while 0.025" works for some designs it is risky for others.
Please be sure to check with the board fabricator BEFORE you complete a 
design with this distance from trace to edge.  In general, thinner boards can
have smaller distances.  This is due to the geometry of the scoring blade
(as it cuts more depth it makes a wider cut path horizontally).

Glenn Heath
Merix Corp.
[log in to unmask]

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