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September 2003

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Subject:
From:
Mike McMonagle <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Fri, 12 Sep 2003 09:15:32 -0500
Content-Type:
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text/plain (105 lines)
Bill,
        Doh! An excellent idea, we've got one that we use for a variety
of soldering/desoldering tasks. They make tips for the tool with two
spaced air outlets for chip components, could probably find one stock
with the right spacing. They also have a holding stand that fixes the
tool in a clamp and allows you to move up and down in the z-axis to an
adjustable stop. You could make a simple locating fixture for
referencing the board to the tool, bring it down into position and use a
crude (yet effective) method of counting the time cycle required
(kitchen timer, etc.). If you wanted to get fancy, you could set it up
with a air cylinder, footswitch and cheap PLC to control the z-axis and
the cycle time....

Mike

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Kasprzak, Bill (sys)
USX
Sent: Friday, September 12, 2003 8:41 AM
To: [log in to unmask]
Subject: Re: [TN] LED Soldering Query


Peter;

Any thoughts on using a Haako hot air tool? I'm sure with a little
operator technique you could solder the parts without damaging the part
or causing spatter from solder paste.

Bill Kasprzak
Moog Inc, Electronics Process Engineering


-----Original Message-----
From: Peter Swanson [mailto:[log in to unmask]]
Sent: Friday, September 12, 2003 4:57 AM
To: [log in to unmask]
Subject: [TN] LED Soldering Query


We have a customer who is looking at assembling some surface mount LEDs
to a FR-4 board. We are told that the parts will not stand conventional
reflow temperatures (they themselves are made with a LMP solder, and the
lens is temperature sensitive). At this stage, I don't know much more
detail.

The query is whether he could print conventional paste, place the
devices and then reflow each joint individually, by using a robot. But a
soldering iron applied the paste will cause spitting, solder balls, etc.

Perhaps a thermode could be applied to the joint and a temperature ramp
up applied, which will safely reflow the paste, if such a thing exists
and can be mounted to a robot.

I would be interested in general thoughts on how to process these parts.
Maybe not even solder...

TIA,
Peter
--
--------------------------------------------------------
Peter Swanson           [log in to unmask]
INTERTRONICS               http://www.intertronics.co.uk
Tel: +44 1865 842842                Oxfordshire, England

INTERTRONICS is dedicated to providing quality material, consumable and
equipment solutions to high technology assembly industries, with the
highest levels of technical support and customer service.

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