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Subject:	Re: X-OUTS
From:	Ioan Tempea <[log in to unmask]>
Reply To:	(Designers Council Forum)
Date:	Fri, 22 Aug 2008 10:40:44 -0400
Content-Type:	text/plain
Parts/Attachments:	text/plain (50 lines)

Susy,

Automating the skipping of x-outs is easy to do, but there are other aspects also, like the wasted solder paste, that you print even on the bad boards, the time wasted to sort and group the panels with similar positions of the x-outs, handling more inventory, disposing of the bad PCBs, etc.

Of course 0 x-outs is not realistic if you want cost reductions. On the other hand, 10% might be too much.

Here's what we specify

* The metrics for calculating the acceptable quantity of X-outs is the number of panels having defective units per lot.
* No panel shall contain more than 10% or 1 defective units, whichever applies.
* Not more than 5% of the total quantity of panels per lot is allowed to have x-outs.
Example: for a lot of 1000 PCBs panelized 20-up, only 50 X-outs are allowed, not more than 2 X-outs per panel, for a maximum of 50 panels that can have a defective unit.

Regards,

Ioan

-----Message d'origine-----
De : [log in to unmask] [mailto:[log in to unmask]]
Envoyé : 22 août 2008 10:27
À : [log in to unmask]
Objet : [DC] X-OUTS

Hi All,

We are having an issue at our company that I would like feedback on.

Our boards are smallish and arrive from the fabricator in an assembly array panel. Long ago, my company's specification document stated that we would only accept 100% good boards on these arrays (i.e. no x-outs) from the fabricator. The issue apparently has not been addressed (here) since that document was written. We have in-house assembly, so I was unaware of the issue until a fabricator brought it up to me. We are now looking into it and realizing that we are paying more for boards done this way and we may be able to allow 10%+ in X-outs on these arrays. (We know how to automate the process at assembly.) My question is, what is "normal" as far as the way others do things? Does your company accept X-outs and if so, what percentage do you allow.

Thanks for any thoughts.
Susy

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