Re: Cost of SMD components mount

On Jul 30, 11:35 am, John Devereux <jdREM...@xxxxxxxxxxxxxxxxxx>
wrote:
linnix <m...@xxxxxxxxxxxxxxxxxx> writes:
On Jul 30, 12:22 am, Jim Granville <no.s...@xxxxxxxxxxxxxxxxxxxxxx>
wrote:
linnix wrote:
I think you are getting a good deal already, USD 165 for 1000 boards.
Many assemblers won't even be interested in such a small lot.

The numbers quoted were per-hour, not totals.

Oh, that would be expensive. I would do it manually. A skillful
assembler (human) can handle them easily. I brought a lighted
magnifying glass for a worker once, but she prefers naked eye and
natural lighting. For $2 an hour (double what she can get elsewhere),
she can solder a 0603 in less than 15 seconds. So, that would be
240 for $2, or less than 1 penny each. TQFP would probably take a
couple of minutes. Once you reflow and clean them up, the boards look
quite good.

That would actually be a worry for me, getting boards assembled in
(say) China. I *want* them made by machine, because then at least I
know I won't get random resistors swapped around

Of course you need a good manager there, doing nothing but watching.
If they do the same component a thousand time at the same place, they
rarely make mistakes. I have done boards with hundreds of components
that way, perhaps 2 to 3 % redos.

or diodes in backwards.

SOT-23 3 pins diodes can't go backward. I just decided to change
from two pins for this reason.


--

John Devereux


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