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October 2016

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Subject:
From:
Larry Dzaugis <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Larry Dzaugis <[log in to unmask]>
Date:
Sat, 8 Oct 2016 10:55:01 -0400
Content-Type:
text/plain
Parts/Attachments:
text/plain (161 lines)
Illustrates the changes in the last 20 years.
Design software can make edits faster.
No longer have a PCB rout taking over 40 hours of computer time and
requiring manual clean up for the final file.
Fab's turn faster, hours not weeks.
PCA assembly can be measured in hours from receipt of file and material to
delivery.
Cost of labor is up proportionately to the material and design cost.
There fewer PCA's that would allow this type of work.
The PCB is spun due to cost of rework or the reliability is compromised by
the rework.

There are fewer folks with these skills that are sharpened with practice.

Long time since I had a PCA with 120  cuts and 125 jumps, even as
prototypes.


On Sat, Oct 8, 2016 at 9:52 AM, Yuan-chia Joyce Koo <[log in to unmask]>
wrote:

> wow. those are prototype style gone wild.  bad designer (of course we can
> never  say that in front of their face ... it may hurt their egos).
>
> On Oct 7, 2016, at 1:47 PM, Steve Gregory wrote:
>
> Hi George,
>>
>> Ha-ha-ha! I know right? But that is what the customer asked us to do. We
>> did some crazy stuff there, Guy Ramsey was my boss back then, he knows
>> about the stuff we did there. The ladies that we had working there had
>> talent like I've never seen anywhere. The same lady that did the quad
>> stacks did this:
>>
>> http://stevezeva.homestead.com/One_piece_of_work.JPG
>> http://stevezeva.homestead.com/One_piece_of_work_2.JPG
>> http://stevezeva.homestead.com/One_piece_of_work_3.JPG
>>
>> This was about a weeks worth of work!
>>
>> Steve
>>
>> On Fri, Oct 7, 2016 at 11:33 AM, <[log in to unmask]> wrote:
>>
>> Hi Steve,
>>>
>>> After looking at your photo of stacked 0402 capacitors I have two
>>> comments:  The first is you are correct that whatever you were paying the
>>> ladies wasn't enough and the second comment is that is crazy.  I rough
>>> counted almost 200 capacitors (at least 48 stacks of 4).
>>>
>>>
>>> Regards,
>>>
>>>
>>>
>>> *George*George M. Wenger
>>> Failure Signature & Characterization Lab LLC
>>> 609 Cokesbury Road, High Bridge, NJ 08829
>>> (908) 638-8771 (Home) (732)-309-8964 (Cell)
>>> [log in to unmask]
>>>
>>> ------------------------------
>>> *From: *"Steve Gregory" <[log in to unmask]>
>>> *To: *[log in to unmask]
>>> *Sent: *Friday, October 7, 2016 1:19:44 PM
>>> *Subject: *Re: [TN] smd component height
>>>
>>> Hello Avini,
>>>
>>> Five capacitors?! Wow, that's quite a stack! I worked with some ladies in
>>> the past where we did quad stacks and that was pretty tough, especially
>>> since they were 0402's. What size caps are you stacking? Do you dispense
>>> any solder paste on the terminations?
>>>
>>> With the stacks that were done in the photo below we had to do it in two
>>> stages, we did the first layer of two capacitors and reflowed the board,
>>> then did the second layer of two capacitors and reflowed things one more
>>> time:
>>>
>>> http://stevezeva.homestead.com/files/Quad_Stack.JPG
>>>
>>> Yes, these are 0402's and everything was done by hand except for the cap
>>> on
>>> the very bottom, it was machine placed. Then paste was dispensed by hand
>>> on
>>> each cap termination and then the stacked cap was hand placed. I don't
>>> know
>>> what we paid those ladies, but it wasn't enough...
>>>
>>> Steve
>>>
>>> On Fri, Oct 7, 2016 at 10:02 AM, Avni Selim Özçukurlu <
>>> [log in to unmask]> wrote:
>>>
>>> Hello All,
>>>>
>>>> I have a question about smd assembly. In the attachment, there are five
>>>> capacitors that mounted like POP. It's height is 10mm. Is there any
>>>> constraint about height of smd components in the IPC-A-610 or any IPC.
>>>>
>>>> We have a trouble about Reflow process for 10mm-component. Solder is not
>>>> run towards to top and it happens cold solder.
>>>>
>>>>
>>>> A.Selim ÖZÇUKURLU
>>>> Aselsan MGEO - CCA Production and Test Engineer
>>>>
>>>>
>>>> ######################################################################
>>>> Dikkat:
>>>>
>>>> Bu elektronik posta mesaji kisisel ve ozeldir. Eger size
>>>> gonderilmediyse lutfen gondericiyi bilgilendirip mesaji siliniz.
>>>> Firmamiza gelen ve giden mesajlar virus taramasindan gecirilmekte,
>>>> guvenlik nedeni ile kontrol edilerek saklanmaktadir. Mesajdaki
>>>> gorusler ve bakis acisi gondericiye ait olup Aselsan A.S. resmi
>>>> gorusu olmak zorunda degildir.
>>>>
>>>> ######################################################################
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>>>>
>>>>
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>>
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