loan - I agree with the likelihood of warping even without seeing your
layout. If you are building only a few prototypes, I would suggest you look
at getting some pallets made. One pallet could have both sides of the PCB on
it, one side next to the other. Ed/
Ed Valentine
Electronics Manufacturing Solutions
8612 Mourning Dove Road, Raleigh, NC 27615
Phone: (919) 270-5145, Fax: (919) 847-9971
Email: [log in to unmask]
Website: http://www.ems-consulting.com
----- Original Message -----
From: Tempea, Ioan <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, May 12, 2000 4:20 PM
Subject: [TN] Board flow
> Hi Technos,
>
> thanks for the meaningfull answers to my OSP problem.
>
> Now, there's something else, related to the same board. The PCB is
> 4.500"x12.350", .070" thick, with fine pitch on both sides. The design was
> made to pass the board through the insertion line widthwise, that is like
> this
> ________
> | |
> | |
> | |
> | | --->
> | |
> | |
> | |
> | |
> |________ |
>
> or this is what the position of the tooling holes suggests, since they are
> at the bottom in the above orientation. I need the tooling holes on my
Fuji
> CP machines. Besides that, along the vertical edges there are components
at
> less than .050" from the edges, so they won't pass through the rails.
>
> My questions are: has anybody already run PCBs like this? Didn't the
boards
> get stuck in the transfer elements?
> Also, I have to run it like this in the reflow, since in the other
direction
> there are components too close to the edges and they would get disturbed
by
> the chain. Since the assembly is heavily loaded with BGAs and micro BGAs
> right in the middle, where the max warpage would occur, shall I attempt
this
> reflow orientation? Or I'd be better off building a jig and pass it in the
> other direction?
>
> Not to be mentioned is that it is about a critical prototype, no samples
for
> a test run, I have to get it right the first time and other nice
challenges.
>
> Thanks again,
> Ioan
>
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