Thanks for the inputs. But my query is more specific on Rigid flex V scoring. We do V scoring at our end as well. 

The issue is with Rigid flex ( or flex rigid) PCBs wherein there will be flex polyimide layers ( mostly at the center,  with the rigid portion towards the outer layers. For a 1.6mm thick rigid PCB, we usually do a 0.6mm depth V cut on either side which means there is a web of 0.4mm. This is easily 'breakable' since it is rigid. But if we have a flex in the remaining web portion, it is not breakable. Hence the doubt on any accepted practice or method for Rigid flex V scoring.

Rgds

Pradeep


-----Original Message-----
From: Nutting, Phil [mailto:[log in to unmask]] 
Sent: Wednesday, January 16, 2013 8:35 PM
To: TechNet E-Mail Forum; Pradeep Menon
Subject: RE: V scoring of Rigid flex PCB

Pradeep,

You will find several discussions on V-scoring in the Technet Archives.  V-scoring is discussed in IPC 2222.

The Internet has many locations that discuss it, for example: http://www.pcbstandards.com/forums/showthread.php?t=2261

To separate the boards at the V-score typically a sharp wheeled device (like a pizza cutter) is drawn over the V-score and does a very nice job of cutting the boards apart.  Bending the boards so they break at the v-score works but is a VERY BAD PRACTICE as it puts large stress on components near the edges which possibly causes failures of the circuit with broken components or cracked etches.

See http://www.cab.de/en/electronics/pcb-separators/ for pcb separators.

Good luck,

Phil Nutting

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Pradeep Menon
Sent: Wednesday, January 16, 2013 8:19 AM
To: [log in to unmask]
Subject: [TN] V scoring of Rigid flex PCB
Importance: High

Sir/Madam,

We have a customer who has asked for v scoring of rigid flex pcb. We are wondering how the PCB will be separated later, once we supply to them. Our customer has a drawing which calls for it, but they are also not very clear on this. We wanted to know whether there is a separate IPC standard or guidelines for V-scoring of rigid flex PCBs.

Tgds

Pradeep



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