On 12.11.2013 11:12, Ruben J=F6nsson wrote:
> Thanks Djula,
>
> Exactly what I am looking for.
>
> So, board size doesn't affect assembly price?

No, just the number of boards/panels.

We are debating the addition of panelization option to the calculator -=20
it is not the same if you assemble 50 panels with 20 boards each or 1000=20
separate boards.

You can use the calculator as it is for panels if you treat one panel as=20
a separate board and multiply placement number by number of boards on panel=
..

>
> Interesting to note that the addition of SMT on 2 sides is cheaper than t=
he
> addition of Lead free. I thought Lead free was more or less standard nowa=
days.

Yes, for consumer products. Automotive and many industrial products=20
still use leaded solder. Customers in USA often choose leaded. Lead free=20
solder is more expensive and the process is much less forgiving.

>
> What is the "No of SMT Pads (optional)" for? It doesn't seem to change th=
e
> price.

It does for simple boards that have many small components, i.e. LED signs.

>
> No. of through hole placement doesn't care about number of pins? What if =
I have
> 10 TH 164 pin PCI connectors?

For wave soldering it doesn't matter much but yes, the number of pads=20
would affect the calculation. We wanted to keep the calculator simple=20
for average users, to avoid having to enter 20 parameters to get the price.

>
> How are the majority of boards done? A, B or C or any other according to =
my
> text below?

Majority (50%), easy:
A. SMD and TH components on the same side

Sometimes (30%), harder:
B. SMD on one side and TH on the other side

Sometimes (20%), hardest:
C. About half of the SMD on one side, the rest on the other side and
TH on one side.

Djula

>
>
> /Ruben
>
>
>> Ruben,
>>
>> We are contract manufacturers in Serbia. The answer to your question
>> depends on the quantity of boards and the technology used, I am talking
>> here about 10000 units or less:
>>
>> If you use SMD on both sides, that requires one extra stencil, and one
>> extra process through the SMD line - that will definitively be more
>> expensive.
>>
>> TH is more difficult to assess - if you keep TH and SMD on one side, TH
>> can be wave soldered and the cost for manufacturer will be minimized.
>> With SMD and TH on different sides, the TH pads will be between SMD
>> components and that is extra work - you have to solder TH manually or
>> with selective soldering.
>>
>> However, western (more expensive) manufacturers don't have time to
>> calculate this for each order so for smaller runs they just average out
>> the costs and you will get the same price regardless of job difficulty.
>>
>> We are collaborating with a company that sells PCBs and membrane keypads
>> and we have a calculator that went online a few days ago, you can play
>> with it to see what prices you get:
>>
>> http://www.accredologistics.com/
>>
>> The site is ugly and the calculator may have bugs especially at
>> extremely small or large inputs but try it out, questions and comments
>> are most welcome!
>>
>> Djula
>>
>>
>>
>> On 12.11.2013 9:40, Ruben J=F6nsson wrote:
>>> Hi,
>>>
>>> I have always made my boards with SMD components on one side and TH
>>> components on the other side. At least 90% of the components are SMD
>>> (the numerical ratio, not the size). I find this very usefull because
>>> the TH components are almost always larger type of components
>>> (connectors, relays, large capacitors, large inductors...) and some
>>> of the SMD components can be placed under the larger TH components to
>>> save board space.
>>>
>>> Now I have been thinking of this in terms of cost. Say we have 3
>>> different boards with the same amount and type of components (more
>>> than 90% SMD) and the same size of the board. How would the assembly
>>> cost compare between these boards if they where:
>>>
>>> A. SMD and TH components on the same side
>>>
>>> B. SMD on one side and TH on the other side
>>>
>>> C. About half of the SMD on one side, the rest on the other side and
>>> TH on one side.
>>>
>>> Would the cost differences change with different volumes (say 100,
>>> 1000 or 10000 boards)?
>>>
>>> I am looking for numbers like C would be 75% more expensive than A in
>>> 100 volumes and 50% more expensive in 1000 volumes. Or whatever the
>>> numbers are.
>>>
>>>
>>> Can you even make this comparison without knowing the exact size of
>>> the board and the number and type of components? (Not the component
>>> cost, just the assembly cost).
>>>
>>>
>>> Thank you
>>>
>>> /Ruben
>>>
>
>
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> Ruben J=F6nsson
> AB Liros Electronic
> Box 9124
> 200 39 Malm=F6 Sweden
> www.liros.se
> Tel +46 40142078
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
>
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