Some of "panel size tooling" dates back to far simpler days when most laminate was supplied singe sided or double sided. Laminate came in much larger sheets - sometimes up to 48x72 inches - the press size of the laminate suppliers. Shops tooled to some sub-set of a full sheet - you can see that 18x24 would give 8 panels exactly from a "sheet". So, conveyorized equipment, drills, exposure frames, etc all became "standardized" so that they would take the most common "panel sizes". Board fab tooling retains much of this "traditional tooling size". However, with so much multilayer production, where the fab shop does much more of the size selection, much is now tradition than strictly economics.
Check back in your supply chain to see what "standard panel size" has been tooled.
Denny Fritz
-----Original Message-----
From: Jack Olson <[log in to unmask]>
To: TechNet <[log in to unmask]>
Sent: Wed, Oct 31, 2012 12:10 pm
Subject: Re: [TN] FAB: panelization sanity check
Well, I just downloaded a program called "KwickFit" which defaults to 18x24
ith a .65 border
now I don't know why I was thinking 12x18? hmmm... gettin' old I guess)
t also has suggestions for 21x24 and 21x27, not sure why it picks those,
ut not the 22x20
ou mentioned
Thanks for the responses, but the reason I don't want to work with a
pecific supplier is that
e want this to be UNIVERSAL. We want anyone to be able to build it for the
ext 20 years.
ssume we were trying to develop a company standard for a particular type
f products, but
e don't know who is going to build it.
(by the way, KwickFit is a nice tool, easy to use, and free 30 day trial,
o registration required)
anyway, thanks gain,
ack
.
n Wed, Oct 31, 2012 at 10:29 AM, Stadem, Richard D. <
[log in to unmask]> wrote:
> Jack, there are standard flats sizes ranging all the way up to 22" by 20".
I know there are even larger sizes, but they are not "industry standard"
sizes, so to speak.
A good PWB fab house is very willing to help you with proper layout to
optimize the number of blanks that can be taken from a flat, as well as
depanelization schemes. Keep in mind you don't need to be tied into any one
depanelization method, but a combination can also work well. For example,
routings with a score line passing perpendicular through the end of the
routings.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Jack Olson
Sent: Wednesday, October 31, 2012 9:27 AM
To: [log in to unmask]
Subject: [TN] FAB: panelization sanity check
Greetings,
This is a very basic question, but I'm trying to design a board size that
will get the most yield out of a standard 12x18 fabrication panel. It's a
6-layer rectangle with nothing fancy (8/8, 12mil holes, ENIG), but we want
routed (not v-scored in this case) and we want 6 boards per panel.
So I have always used the guideline of 1 inch clear all around the panel
edge, (10 x 16 to working space), and 100mil between boards for routing, so
I am looking at something like 4.95" x 5.26", right?
But in this case even 50mils extra would help me, so I'm wondering how
much I can push the envelope and still have it manufacturable by ANY
competent supplier.
Can two of the panel edges be less than 1 inch?
Do I have ANY wiggle room?
Jack (aka "the new guy")
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