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Re: PCB Prototype

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在 2000年1月25日星期二 UTC+8下午4:00:00，David Knaack(spam blocked email)写道：
> Greetings,
> 
> I recently had a PCB prototype made and I thought I would share the
> experience, so that others might avoid the same mistakes.
> 
> I shopped around for a while and was initially discouraged by the setup fees
> boardhouses charge, which is typically $40 or more.  I finally found a place
> that charged a flat $21 fee per board (single sided 100x160mm FR-4, 1.5mm,
> 1oz copper, with solder mask and component mark, $2.60 extra if over 500
> holes).  They are Olimex, in Bulgaria (http://www.olimex.com/pcb.html).  No
> problem, I thought, US post office only changes about $5 for a letter to
> Bulgaria, so it ought to be about the same coming back.
> 
> I used CadSofts Eagle software to do my board design, which ended up being
> about 1.5 x 2 cm.  I duplicated the board so that I had 42 copies for output
> and sent it off (actually Olimex duplicated the design for me, since the
> free version of Eagle limits you to the board dimensions).
> 
> After the board was finished, they emailed me and informed me that since the
> text I had placed in my component mark to indicate which way was up (so they
> would not mistakenly mirror it) was less than 12mils and had not come out,
> so they had mistakenly mirrored it (apparently they did not notice that 'C1'
> and 'U1' labels, which are visible, were mirrored too).  No big deal, there
> are only 3 parts on the board anyway, it just won't have a version number
> and my email address.
> 
> In the same email they inform me that TNT (the local postal service??)
> refused to 'ship with freight collect to US ', so they had sent it UPS.  A
> few days later UPS shows up and wants $75.25 before they will give me the
> package (which is a very large manila envelope filled with bubble wrap
> around this little fiberglass board).
> Fortunately I happened to have $75 I could pay them with, and was able to
> get the package.
> 
> Apparently the $75 was customs fees for getting this thing into the US.
> This is truly an insane amount to charge for bringing 40 grams of fiberglass
> costing $20 into the country.  Anyone know if simply putting it in an
> envelope with no packing material would avoid the fees?
> 
> On examining the board, I found that the copper and solder mask was perfect.
> The only problem is that the component mark for the single IC (which was
> centered on the board and so was still in the right place) was on top of the
> solder pads.
> 
> The component mark for the parts in Eagles libraries includes little lines
> where the pins will be, and so the pads all get covered in  white component
> mark ink (whatever that is).  Fortunately, since the pads are tinned, it is
> easy to scrape off, but cleaning 336 tiny SMD pads was not how I wanted to
> spend my time.
> 
> I've posted a question to the Eagle forum to see if I made a mistake on the
> component mark, but I don't see how I could have gotten around it without
> modifying the mark itself.
> 
> So, I've spent $100 for a single 100x160 board.  I'm fortunate that since it
> contains multiple copies of my PCB the cost is distributed down to about $2
> each, or I'd never make my money back (they are part of a kit I am selling).
> Over all I am satisfied with the board, although it cost me 5 times what I
> was expecting to pay.  If you can get around the customs fees in the US (its
> not a problem if you are in Europe), and you make sure your stuff is clearly
> marked so it doesn't get mirrored, Olimex really is a bargain, I give 'em a
> thumbs up, hooray for no setup fees!
> 
> The next step is to cut the little guys apart and try my hand at soldering
> SSOP chips with a regular iron. :)
> 
> DK
> --
> It does not do to leave a live dragon out of your calculations, if you
> live near him.        -- J. R. R. Tolkein

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