Hello Lee,

Check IPC-2221 or IPC-2222, there is a section on scoring.  I just plain
forget which one its in!!!

Or, Check out IPC EXPO Proceedings 1997 Session 10-5 & 10-6

Oversize problems may be a result of the WEB being too big and not the
location, just a though.

However, tolerances are based on material being scored as well as machine
type and setup.  Material movement vs. thickness vs. methodology are all
important.  I do have some questions that may aid in you determination.

Did this problem occur on the first order, or is this a mature design?
Have you recently changed fab houses?
Has the fab house changed number up per production panel?
Does the fab house have a machine or do they rely on an outside service?

Some fab houses hold a tighter tolerance than others, both in spec, just one
tighter.  Large volume re-orders may result in a fab house changing their
production tools.  On an outside service, the low bidder gets the work.

Just some thoughts,

JOE SENDZ............

 -----Original Message-----
From:   TechNet [mailto:[log in to unmask]]  On Behalf Of Lee PengSoon-CPL035
Sent:   Wednesday, April 21, 1999 7:59 PM
To:     [log in to unmask]
Subject:        [TN] PCB Scoreline (V cut) tolerance

Hi all,
We are have problem on oversize pcb width due to the bad cpk of the v-cut
location.
what is the v-cut tolerance should be set so that it is 6 sigma achieveable?
Any industrial standard??


Regards,
Lee

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