Re: V Cut for multiple layers PCB

On Sun, 11 Mar 2007 09:29:28 GMT, the renowned PeteS
<peter.smith8380@xxxxxxxxxxxx> wrote:

Spehro Pefhany wrote:
On 10 Mar 2007 18:28:35 -0800, the renowned "kunil"
<kunilkuda@xxxxxxxxx> wrote:

Hi all,

I need second opinion about V Cut for multiple layers PCB.

I designed a 4-layers PCB, and want to buy 1 or 2 PCB panels from this
PCB manufacturer. The PCB manufacturer offered me a V Cut to separate
each copy of my design. They said it'd be cheaper since I could break
the V Cut with my own hand, rather than separate them using CNC drill.

In my opinion. breaking V Cut using my own hand could crack the image
layer / inner layer of the PCB. Am I right about this ? Or V Cut is OK
for separating multiple layers PCBs ?

Thank you for your help

Regards,
-kunil

I've had no problems with this, but usually the inner layers are power
planes and I keep traces and planes well away from the V-groove.


I agree. Inner layers on all my boards have a greater keepout to the
edge then surface layers. My surface keepout from the edge is usually 50
mils minimum and inner layers are 75.

As to breaking them apart, it's ok if you take care. My experience is
the same; I've had no problem breaking V-score boards apart by hand.

Cheers

PeteS

It can reduce handling costs if the boards are left attached through
the assembly and even the testing process.

There is some cosmetic deficiency in the edges, and they can affect
people like myself who have skin that is sensitive to the dangling
fibers, but if there are no tight mechanical requirements on the
V-groove edges, it works fine.


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@xxxxxxxxxxxx Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
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