We use Siemens equipment and it has the capability of recognizing "ink spot"
covering the fids. We use cheap stickers to cover the fids on x'd out
boards and the equipment automatically skips those circuits in the panel.
Be careful of the sticker type though. The vision system can pick up the
fids through some and will place components.
-----Original Message-----
From: Miswald, Ron [mailto:[log in to unmask]]
Sent: Friday, March 12, 2004 8:52 AM
To: [log in to unmask]
Subject: Re: [TN] Board panelization - bad boards
Dale
How about a block skip on a board. We are currently placing a 1 X 1.5MM
piece of metal for one (it isn't actually being used). The theory is to
cover the metal with permanent marker to stop the individual piece from
being assembled. At one point a large area in legend was proposed for this
purpose too.
The metal skip has actually been on our boards for awhile now. Does anyone
use anything like this?
-----Original Message-----
From: Dale Ritzen [mailto:[log in to unmask]]
Sent: Friday, March 12, 2004 9:56 AM
To: [log in to unmask]
Subject: Re: [TN] Board panelization - bad boards
Mark,
You determine this "where the rubber meets the road" - at your P&P equipment
setup. There you will reach a point of diminishing returns if your "step and
repeat" functions are hobbled by X-out boards at different locations within
the panel. My general rule of thumb (not an industry standard by any means)
is if I get more than 2 panels with X-outs in different locations (this
quantity may depend somewhat on the cost/volume of boards to run), the
boards go back to the supplier. I don't want to have to sort panels by X-out
locations and group them unless the volume and/or cost dictates that we have
to use them. That's a board shop issue - not mine. This also creates lengthy
tear down / set up time for each board run (which we cannot afford - time is
money!) if you try to use panels with differing X-out locations.
Board houses can and do work with you, once your expectations are
known/communicated. Of course they may bring this up during pricing
negotiations, but they are trying to protect themselves a bit, too. There's
a happy medium that you come to which allows you to receive the type of
product you need, yet allows the board houses to make their nickel, too.
Getting the expectations in front of the supplier up front, then enforcing
them as each order is received, are the two keys to this problem.
My two cents worth,
Dale Ritzen, CQA
Quality Manager
Austin Manufacturing Services
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Mark Larson
Sent: Friday, March 12, 2004 9:13 AM
To: [log in to unmask]
Subject: [TN] Board panelization - bad boards
Hi,
When boards are delivered as a panel for assembly it is not necessary
for all boards on the panel to be good, you don't want to scrap a panel
because of a small number of bad boards on the panel. My guess is that
if the panel contains 80% good boards you don't want to throw away the
entire panel, yet if there is only 20% good, it may not be cost
effective to send it through assembly (and you've probably lost faith in
that fabricator's boards). So is there a point where the number of bad
boards on the panel makes the entire panel scrap? How do you determine
that?
Mark Larson
Sr. PCB Designer
Analog Technologies Corporation
11441 Rupp Drive
Burnsville, MN 55337
952-894-9228 voice
952-894-2966 fax
[log in to unmask]
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