rework: you mean take the original part off and rotated 90 degree and put
back on the same part? or you intend to put a new part on?  If it is old
part - you might got difficulty due to damaged lead (coplanarity is
gone... unless you have enough space to push down using bar, etc.).  if it
is new part, since you are going to do 10's thousands, you might get some
pre-form made to match the footprint and use hot air pencil or small batch
reflow - depend upon what your design is on the other side... dip on fine
pitch is "play with fire"... assume it is Cu-based leads.   - my 1.5
cents.
              jk
> Hi Bob,
>
> 10's of thousands? Wow. I have never used dipping pastes, but it would
> seem
> to me that you would definitely need some sort of automation to accomplish
> this, have you looked at automated lead tinning machines?  Ace Production
> Technologies, RPS Automation, and Corfin Industries make lead tinning
> systems. I would also guess that the solder would tend to stay towards the
> bottom of the lead and not coat the entire lead with the dipping paste.
>
> Good luck!
>
> Steve Gregory
>
> On Mon, Jun 29, 2015 at 10:25 AM, Bob Wettermann <[log in to unmask]>
> wrote:
>
>> Hi All:
>>
>> We have a project where we need to rework 10's of thousands of LQFP
>> 100/0.5mm pitch devices. All options are being considered.
>>
>> Since the PoP dipping pastes have come in to their own has anyone tried
>> using these pastes to dip for fine pitch rework?
>>
>> Thanks!
>>
>> --
>> Bob Wettermann
>> BEST Inc
>>
>>
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