TECHNET Archives

June 2015

TechNet@IPC.ORG

Options: Use Monospaced Font
Show Text Part by Default
Show All Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Subject:
From:
Joyce Koo <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Mon, 29 Jun 2015 16:59:39 -0400
Content-Type:
text/plain
Parts/Attachments:
text/plain (90 lines)
http://www.zeph.com/pencil.html
hot air pencil...
> 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
>>>
>>>
>>> ______________________________________________________________________
>>> This email has been scanned by the Symantec Email Security.cloud
>>> service.
>>> For more information please contact helpdesk at x2960 or
>>> [log in to unmask]
>>> ______________________________________________________________________
>>>
>>
>> --
>>
>>
>> This email and any attachments are only for use by the intended
>> recipient(s) and may contain legally privileged, confidential,
>> proprietary
>> or otherwise private information. Any unauthorized use, reproduction,
>> dissemination, distribution or other disclosure of the contents of this
>> e-mail or its attachments is strictly prohibited. If you have received
>> this
>> email in error, please notify the sender immediately and delete the
>> original.
>>
>>
>> ______________________________________________________________________
>> This email has been scanned by the Symantec Email Security.cloud
>> service.
>> For more information please contact helpdesk at x2960 or
>> [log in to unmask]
>> ______________________________________________________________________
>>
>
>
> ______________________________________________________________________
> This email has been scanned by the Symantec Email Security.cloud service.
> For more information please contact helpdesk at x2960 or [log in to unmask]
> ______________________________________________________________________
>


______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask] 
______________________________________________________________________

ATOM RSS1 RSS2