On Mar 11, 1:39 am, Spehro Pefhany <speffS...@interlogDOTyou.knowwhat>
wrote:
> 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've had mixed results. I guess I'd break someone else's boards this
way, but not ones I'd paid for. Blades are cheap :)
Reply by Spehro Pefhany●March 11, 20072007-03-11
On Sun, 11 Mar 2007 09:29:28 GMT, the renowned PeteS
<peter.smith8380@ntlworld.com> wrote:
>Spehro Pefhany wrote:
>> On 10 Mar 2007 18:28:35 -0800, the renowned "kunil"
>> <kunilkuda@gmail.com> 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@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
Reply by Alf Katz●March 11, 20072007-03-11
"kunil" <kunilkuda@gmail.com> wrote in message
news:1173580114.925374.49940@v33g2000cwv.googlegroups.com...
> Hi all,
>
> I need second opinion about V Cut for multiple layers PCB.
>
<Snip>
I've had success in getting th PCB manufacturer to completely separate
boards by V groove. Cheaper than routing. Leaves a sharp corner that can
give you FG splinters, though.
Cheers,
Alf
Reply by PeteS●March 11, 20072007-03-11
Spehro Pefhany wrote:
> On 10 Mar 2007 18:28:35 -0800, the renowned "kunil"
> <kunilkuda@gmail.com> 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
Reply by Spehro Pefhany●March 11, 20072007-03-11
On 10 Mar 2007 18:28:35 -0800, the renowned "kunil"
<kunilkuda@gmail.com> 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.
Reply by CBFalconer●March 11, 20072007-03-11
larwe wrote:
> On Mar 10, 9:28 pm, "kunil" <kunilk...@gmail.com> wrote:
>
>> 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.
>
> It's not wise at all to try and just break a scored PCB (for the
> reasons you otulined, plus stress around vias close to the flex line).
> However you can use a knife or saw to do it by hand, without much
> risk.
Pay the 2 dollars. Epoxy boards are hell on knives, drills, saws.
--
Chuck F (cbfalconer at maineline dot net)
Available for consulting/temporary embedded and systems.
<http://cbfalconer.home.att.net>
--
Posted via a free Usenet account from http://www.teranews.com
Reply by larwe●March 10, 20072007-03-10
On Mar 10, 9:28 pm, "kunil" <kunilk...@gmail.com> wrote:
> 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.
It's not wise at all to try and just break a scored PCB (for the
reasons you otulined, plus stress around vias close to the flex line).
However you can use a knife or saw to do it by hand, without much
risk.
Reply by kunil●March 10, 20072007-03-10
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