The cracker holes should be designed so that the nubs (left after breaking)
do not protrude beyond the PCB dimensions. This means that there will fall
inside the board and leave a mousebite which can be about .010 inch, if
designed properly. Hope this helps.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Joel Alexander
Sent: Wednesday, January 24, 2007 7:04 AM
To: [log in to unmask]
Subject: [TN] Question about cracker holes (panel breakaways)


We have been using panels with internal breakaways for over 20 years.
There is a slight amount of material left when they are broken but we have
never had a customer complaint about this.

We have started doing military business and they are rejecting everything
because the cracker hole areas exceed print dimensions.  It is obvious
that the additional material at the cracker hole location does not have
any impact to the end use.

Is there any industry standard that would permit the use of cracker holes

Also has anyone had similar experiences dealing with military customers
and if so what was the end result?



Joel Alexander

Quality Assurance Manager

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