Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

One point I have never seen touched-on in this group: Much copper-clad
(all?) seems to be manufactured with 1/2 oz. copper, as MOST boards are "plated
through" after drilling but before resist is applied, and tin-plated. Then,
the copper is "1 oz."

I picked up some ca. 4" wide x 3' waste, double-sided copper, from a local
PCB house (they explained anything narrower than 4" just won't work in their
plating- and etching machines, so once stock gets that narrow, they scrap it).
It etched MUCH faster than I THOUGHT I had used before, and I did some
forensics. That prompted a call to the PCB house folks, and they confirmed, they
buy-in 1/2 oz. stock, as it is less expensive than 1 oz., so saves money,
etchant, and time. What about this, Gang??? Jan Rowland


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