4, 6, 8 up I can imagine, 20 up thats alot and the panel is way too big for
0.7mm. Who made this decision?
Regards
Edwqard Brunker
-----Original Message-----
From: Tenison Stone [mailto:[log in to unmask]]
Sent: Thursday, February 24, 2000 2:16 PM
To: [log in to unmask]
Subject: Re: [TN] 0402 parts on .031 Boards
Board size is approx. 2.3" x 2.4"
panel is 20-up size is approx. 13" x 9.5"
Production says it doesn't matter what size the panel is, they cannot place
0402
on .031" material. Help!
Material if FR4 double sided
Tenison
Brunker Ed <[log in to unmask]> on 02/24/2000 07:26:00 AM
Please respond to "TechNet E-Mail Forum." <[log in to unmask]>; Please respond
to
Brunker Ed <[log in to unmask]>
To: [log in to unmask]
cc: (bcc: Tenison Stone/BlueEarth/Telex)
Subject: Re: [TN] 0402 parts on .031 Boards
Come on guys. Let's get a few more facts. What are the dimensions, how many
layers and what about the panel?
We have put 0402s down on boards of this thickness, without problems. The
stability of the PCB may be due to other issues?
It may be possible to stiffen up the board by changing the prepreg used at
fabrication.
Tell us more.
Regards
Edward Brunker
-----Original Message-----
From: Martin Christie [mailto:[log in to unmask]]
Sent: Thursday, February 24, 2000 8:34 AM
To: [log in to unmask]
Subject: Re: [TN] 0402 parts on .031 Boards
Tenison,
Use some sort of rigid carrier, preferably CDM material, to carry the board
through the p&p and reflow processes. You'll need to work on the carrier
design to ensure that you don't shadow areas of the board but it can be done
fairly easily.
I think you'll find this is how most flex assemblers overcome similar
problems, it's certainly what I used when I worked in flex assembly.
Martin Christie
===== Original Message from [log in to unmask] (TechNet E-Mail Forum.) at
23/02/00 22:42
>Techies,
>
>I need help!!!
>
>I have 0402 parts on a .031" board.
>
>I use a Multitroniks 6000 pnp machine.
>
>Production says the parts keep popping off the boards because they are so
thin.
>They claim it does not matter how small the flat is, they cannot place 0402
on
>.031 material.
>
>I believe this can be done.
>
>How do you handle this situation?
>
>Tenison Stone
>Telex Communications
>Blue Earth, MN
>
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