Does anybody having experience with CAB Maestro $M PCB cutter. We are facing 
problem with at least one assembly where components at proximity of 
v-grooves are getting damaged. We are not sure whether this problem is due 
to cutter process or the design of the panel itself.
The IPC-SM-782 AUG1993) does not clealy elaborate on the min space between 
the edge of groove and the nearest component.
Can anybody explain on this ?
The board is 2 layer smt on top side 0.095 inches thick v-groove is 0.050 
inches wide, 60 degrees and uncut is 0.020 inches. material of laminate is 
FR4.The nearest component to the edge of groove is 0.5 mm(0.020 inches) away 
and it is ceramic capacitor 0.85 mm high.
The cutter blade top and bottom are 10 degree and edges are at same level . 
Cut is made in single pass and board is held without fixture.

Technical advise on this will be highly appreciated. Thanks.
 ----------
From: Steve Collins
To: Ed Gavin
Cc: IPC
Subject: Re: FAB - Scoring PCB panels
Date: Friday, May 02, 1997 7:36PM


Ed, When call out a V-Groove spec be sure spec material remaining not what
is removed. Also be sure that the v-grooves are perpendicular to each other
not off set. We typ spec for FR-4 .018-.024 and for MC-3 material .030 -
.040. This inf. for .062 thick boards. Also be careful using scoring
because at one time there were two different processes to do this. One was
to use a machine that really looked like a pizza cutter and all it did was
break the first two layers of glass and did not work well with FR-4
material. The second is actually cutting material away and this is referred
to as V-Grooving. Unfortunately the terms are used generically and one
needs to be careful if they are using a supplier that has one of these
older processes still in use.

Hope this is helpful.
Steve Collins
PCB Design Supervisor
Antec

 ----------
> From: Ed Gavin <[log in to unmask]>
> To: [log in to unmask]
> Subject: FAB - Scoring PCB panels
> Date: Friday, May 02, 1997 8:04 AM
>
> On 0.062 inch thick boards, we currently call for a 30 degree score,
> 0.020 inch deep on opposing sides of the board.
> We are trying to develop our standard for scoring.  Is this what most use
> for scoring?
> Do you score boards thicker than 0.062 and if so what dimensioning do
> you use for those?
> If given the choice would you select scoring over routing? why?
>
> Thought this might be of general interest to the board community.
>
>
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