interesting, thanks
Dennis Saputelli

JaMi Smith wrote:
> 
> Dennis wrote:
> 
> >jami,
> >re your 25 mil hi silkscreen
> >do the fab shops complain?
> >can you actually read it or does it all glob together?
> >when it is that tight and when they can't be charted off to the side
> >somewhere we usually move them to another non fab layer and move them
> >right on top of the pads and present those on paper or PDF
> >
> >of course the pick and place machine doesn't care
> 
> It is pretty small, but is usually legible, and I have been lucky most
> of the time in that I could either run a line (5 mil track) on the
> silkscreen layer out to a point that was open enough for the ref
> designator, or in instances where I have 4 channels, they have identical
> layouts, and I can usually identify each component in in at least one of
> the 4 channels, and I usually then identify those parts in common
> channels as RX-1, RX-2, RX-3, and RX-4, and so on.
> 
> As you say, the pick and place machine doesn't care, but the girl who
> does most of our prototype assembly does want a ref designation
> somewhere, since I usually just kick out a composite Print of MECHANICAL
> 4 (which I use for board outline), TOP (or BOTTOM) PASTE (which shows
> the pads), and TOP (or BOTTOM) OVERLAY (the Reference designators) at
> about 2X size, which fills in as a makeshift Assembly Drawing. Once we
> start shipping product, then I can worry about real Assembly Drawings.
> 
> We actually setteled on the 5 mil line thickness for the text after
> talking with our board house, who said that that was the smallest they
> were comfortable with, and the 25 mil height came about since it was
> about the smallest we could go and still understand with that line
> thickness.
> 
> I will admit though, on a few of these designs I have had to go in and
> apologize to our assembly girl in advance, since some of the things I
> have packaged needed to be assembled in a specific order, such as an
> 0402 cap down in between a tantalum cap and a molded inductor. Once
> again, the pick and place didn't care, and there was enough room for
> either IR or Hot Air reflow,  but it makes a big difference when your
> 00SA Tweezers can't get down in to a hole at the same time as your
> smallest tip for the Metcal.
> 
> JaMi
> 

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