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January 1998

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Subject:
From:
"Jeffery L. Hempton" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 26 Jan 1998 06:31:46 -0500
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Andrea,
  We have had great success using stock .062" thick PWB material as card
carriers. We also have more of a high-temp material that has proven to
withstand many reflow cycles. I even use our board router to fabricate the
carriers, which is a plus since I can fab everything in our department
cheaply. Then we put press-fit pins in to locate the boards. We normally use
this method to add extra support for board assemblies that are .020"-.035"
thick, but it could be utilized for your function. The obvious concern I
would have with 1\4" thick stock is all that mass effecting your reflow
profile...if you are running forced air convection, it is a little less of a
concern, but still going to effect your profile/reflow greatly. Feel free to
call me directly if I can answer specifics for you.

At 04:37 PM 1/23/98 -0500, you wrote:
>I would like some help on finding a good material for making card carriers
>to go through the reflow oven.  We will be assembling a card with PTH
>connectors on both sides and will use the paste in hole process.  The
>carrier would hold the bottomside connectors and support the board but
>cannot absorb too much heat to affect reflow.  I have heard of ECP Plus
>from EMC and Delmat for making wave solder card carriers.  Are those
>materials good for reflow as well?  Is there anything better, less
>expensive, easier to machine, etc. out there?  I would like to get the
>material in approximately 1/4" thick sheets and then have them milled out
>in our machine shop.  You can e-mail me directly at [log in to unmask]
>
>Thanks for your input,
>Andrea Shurtz
>Lexmark Electronics
>
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----------------------------------
Jeff L. Hempton        phone: (219) 429-7335   Fax: (219) 429-4688
Boardshop Manufacturing Engineer                        Mail Stop: 25-31
Raytheon Systems Company
1010 Production Road, Fort Wayne, IN 46808-4106
Email: [log in to unmask]

"The man who rolls up his sleeves seldom loses his shirt."--Thomas Cowan

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