I've seen a similar board before when I visited another manufacturer, the
boards were even smaller .
They used a carrier wich consisted of two parts. A dedicated bottom
carrier where the boards were placed and a dedicated top carrier wich
fitted exactly over the bottom .
Multiple boards could be fitted in one carrier.
By using two matching carriers the boards were held in place.
But in both carriers there was one large "cut out" in the component area .
After loading the boards in the carrier they started to dispense
solderpaste onto the component pads with a camalot in-line dispenser
Component placement and reflow was also done in-line. So the complete
process was automated.
When the top side was finished ,they turned all the carriers and proceeded
with the bottom at exactly the same way.
Jowan Iven
Process Engineer Manufacturing
Stork Electronics
-----Original Message-----
From: Brooks Bill [SMTP:[log in to unmask]]
Sent: Tuesday, September 26, 2000 8:52 PM
To: [log in to unmask]
Subject: Re: [TN] DENSE SMT ASSEMBLY
I never worked with 5 mil 6002 before, but knowing the nature of the
material, you will have a handling challenge on your hands. We dropped some
20 mil 6003 from table height and it landed on its corner and wrinkled up
like a Ruffles Potato chip. Totally ruined the board. You will need support
under the board to prevent warping and stretching. I would suggest a good
holding fixture to stay with the board through assembly, preferably with
some tooling holes for alignment. Contact Rogers for guidelines on
handling,
etc. they may have some input that will be useful. Most everyone who makes
a
board like this needs to attach it to a carrier of some sort. Find out what
they plan to do...
Just my thoughts...
Bill Brooks
Senior PCB Designer - [log in to unmask]
Zoneworx, Inc.
40925 County Center Drive, STE 200
Temecula, CA 92591
http://www.zoneworx.com
Tel: (909) 296-1226 x 1037
Co-Director / Education Officer / Webmaster
for the San Diego Chapter of the IPC Designers Council
http://www.ipc.org/SanDiego/index.html
http://home.fda.net/bbrooks/pca/
-----Original Message-----
From: Marsico, James [mailto:[log in to unmask]]
Sent: Tuesday, September 26, 2000 11:16 AM
To: [log in to unmask]
Subject: Re: [TN] DENSE SMT ASSEMBLY
Yes, I'm afraid I am serious... The board is 5 thousandths of an inch
thick
and is made of 6002 Rogers Duroid!
Thanks,
Jim M.
-----Original Message-----
From: Bev Christian [SMTP:[log in to unmask]]
Sent: Tuesday, September 26, 2000 1:55 PM
To: [log in to unmask]
Subject: Re: [TN] DENSE SMT ASSEMBLY
Jim,
Are you serious?! Did you really mean the board is 5 thou thick or
that the
Teflon coating on the board is 5 thou thick or did you mean a 50
thou thick
board?
Bev Christian
-----Original Message-----
From: Marsico, James [mailto:[log in to unmask]]
Sent: Tuesday, September 26, 2000 1:11 PM
To: [log in to unmask]
Subject: [TN] DENSE SMT ASSEMBLY
Hello Technet:
Well, the Electrical Engineers did it to me again! They're
designing an
assembly consisting of a Teflon surface mount board .005" thick,
approximately 1.5 x 1.7", with 320 components! The component mix
is
mostly
0402's (resistors, caps and inductors) and 30 SOT-363s. Does
anyone
have
any suggestions as how to automate this assembly process?
Thanks in advance,
Jim Marsico
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