gEDA-user: alarm clock boards are in!

[DJ Delorie <dj@xxxxxxxxxxx>]

I went with Sierra this time, to try them (and their new 4-layer
pricing scheme) out.  They use "standard" 6/6/15 rules, compatible
with pcb-pool and 4pcb, other vendors I've used.

My initial impression is that the quality is quite good, almost as
good as 4pcb.  The drills were within a mil or so, but the mask was
off by 3-4 mil, just enough to barely overlap the copper.  4pcb's mask
was off a little too, but not quite enough to overlap the copper.
It's close enough to be statistically "about the same".

Here's a 15 mil drill with 7.5 mil annulus, 3 mil gap-to-mask, and an
8 mil line: http://www.delorie.com/tmp/spe.html

One other drawback was that they don't accept a separate outline
gerber; I had to modify pcb to draw the outline on the solder mask
gerber.  They were, however, slightly cheaper.


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