PCBFabexpress Green Boards
Wednesday, April 14, 2004 at 05:50AM Tonight i got some great feedback on the appearence of the keychain device. Specifically, they liked having the look of the green pcb. To see how much we could get the cost of the pcb to using a PCB board house which applies the green lpi solder mask i priced out several board houses.
PCBFabexpress offers a deal where you get a board for $13 per board (min quanity 5) and the board can be up to 20 sq inches.
Each device is 1"x2.5" which means we could panelize them on a boardand get 10 on one board and then we'd just have to use our CNC machine to cut the larger board into smaller boards. But to take intoconsideration the 1mm router bit width it's safe to say we'd only getabout 9 boards out.
So the cost per board is $13/9 which is $1.44
The minimum order requirements would make it so we'd get 40 boards for $65 dollars + shipping.
I found a much cheeper board house: Olimex they sell you a panel thats 12.6"x7.8" for $104USD. We could fit at most 35 boards on the panel so it'd cost us per board 104/35 =$2.97
- In order to get the best deal with them we'd have to try to make the following optimizations:
reduce the number of holes but most importantly the number of hole sizes. - if possible make trace widths greater then 20mils so etch resistsingle silkscreen printing can be used rather then dry film lamination,exposure, developping
Bare Bones PCB:
1000 boards would cost $1.59 a piece but would be precut. But no solder mask.
Blake Robertson
I emailed olimex to get some price quotes on the how much we could get our board for at production quanities. Below is the email:
> We are trying to get a quote estimate for our board in quantities of
> 100, 200 and 1000.
FR-4, 1.5 mm, 35/35 um copper, soldermask, component print, 15 working days:
100 pcs $215
200 pcs $350
1000 pcs $850
> We want the board made as cheaply as possible. Our circuit is a
> straightforward low speed board.
> The board is 1" x 2.5".
> Two SMD IC's, and 8 other components.
> The circuit was initially designed for easy assembly because we were
> going to be putting together ourselves.
> We could reroute the board such that only three drills are necessary
> (.8, 1.1, and 4.0).
>
> How many boards would we have to order to get the board cost down to
> about $0.70?
more than 3000 pcs
> How many boards would we have to have assembled such that the assembly cost
> was $1 per board?
machine assembly:
one time setup stencil & programming $200 setup per lot $20 (min.)
1000 pcs assembly $1000
$1.00/ea
manual assembly 100-200 pcs
setup per lot $20
$3.50/ea
EXW no packing, no shipping, no component cost, no programming, no functional test included in above quotes
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