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

Grant,

You could try using one of the Little Giant pumps. I haven't bought
one of these pumps in years but they used to cost about $25 from WW
Grainger. Kepro uses this small pump in their etchers. They modify
the pump by removing the metal impeller and installing one made from
PVC plastic. There are two pumps in the machine, one for each side.
The manifold is made from 1/2" CPVC pipe. The pipe has about twenty
or so small holes drilled to give the spray pattern. A piece of
plastic window screen hangs between the manifold (spray bar) and the
part to be etched. This screen is used to disperse the spray pattern
across the board for even etching. It works pretty good with 1 ounce
copper taking about 4 minutes to etch with ferric chloride.

Tom