Hello Michael,
It would be a good idea to talk to your intended fabricator, they are
usually only too helpful.
It is often best to let them set up the panel for you. In fact, the only
time I personally define any board arrays is when I want to define a
particular assembly pallett. For single boards I leave it up to them.
Of course you may want to know how many you can expect from a panel. Bear in
mind that if you order the exact number of boards that you calculate can fit
on a panel, then there is no room for error or any failed boards.
I use a manufacturer here that will produce prototype panels, of as many
boards as will fit. I have an idea of how many boards I will get back, but
take into account that I may be occasionally one or two short due to
fabrication problems.
A standard size our manufacturers use for single / double sided is 18" x
12". I believe that some can handle 18" x 24".
They usually prefer to leave 0.3" between boards, forming a web, that way
the panel stays together and maintains its tooling datums as it is routed.
If you really want to jam a lot of boards on a panel, specify V-scoring.
(you get a rough edge though)
Usually, about 1" around the edge is unuseable.
regards,
Phil.
Phil Dutton C.I.D.
Senior CAD Technician
IPC Certified Interconnect Designer
Tenix Defence Systems Pty Ltd
Systems Division - Adelaide
Second Avenue, Technology Park,
Mawson Lakes. SOUTH AUSTRALIA 5095
-----Original Message-----
From: Hiteshew, Michael [mailto:[log in to unmask]]
Sent: Thursday, 29 March 2001 5:52
To: [log in to unmask]
Subject: [TN] Laminated FR4 Standard Sheet Size?
Hi TechNetters,
I'm trying to determine how many PCB's will fit comfortably on a
standard sheet of laminated FR4. This is for a single sided rectangular
board 2.5" x 3.5". Here's what I need to know:
1. How big is a standard sheet of FR4?
2. How much room do I allow between each PCB for routing bits?
3. How much material do I need to allow for around the edge of the sheet as
unusable?
Thanks in advance,
-Michael Hiteshew
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