Re: gEDA-user: Surface mounted circuits in hobby projects

[Steven Michalske <smichalske@xxxxxxxxx>]

On Apr 10, 2009, at 11:34 AM, Chris Albertson wrote:

>> I tried to desolder a SMD component, a capacitor with solder remover
>> wick (copper braid), and it's very hard to do it.
>
> The class setup is rework tweezers.   It's basically a double tipped
> solder iron and you can just pick up the part off the PCB with
> hot tipped tweezers.
>
> But us poor-folk just heat both ends
> of the part at once with a larger tip solder iron then push the part
> sideways off the pads with the iron.
>
> Also try lifting with normal tweezer while cycling the iron from
> pin to pin.
>
>

My motto when I teach interns to desolder components, you have to add  
solder to desolder.  This is because that solder wik removes solder  
but surface tension will always leave some behind.  forming a weak  
joint, that others here are suggesting you use something to pry off  
the parts.  It works a time or two before you tear off the pad you're  
reworking.

like mentioned above.
Flat wide tip that bridges the part and a large ball of solder to  
transfer the heat,  often it will cause the part to stick to the tip,  
or use the tip to lightly push the part off.

I do reworks with two soldering irons, one in each hand, it offers  
more control,  as I often tombstone parts to do reworks.   
( tombstoning is to stand the parts up on one pad. )

I find the tweezers are more of a hassle than they are worth......
You can buy two nice soldering irons for the price of the tweezers.

nice iron, lead solder, and flux

of if you need to meet RHOS and use lead free, get good solder, I  
don't mind Kester's but I used some brand called eco-solder or  
something like that and ended up gaging on the flux fumes, even with a  
HEPA solder fume extractor.

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