Thanks steve I have been reading the forum for some time I was Referring
to the powder from grinding the whole board HCl first for lead and tin nitric for silver, palladium, copper and AR for gold and platinum
[/Grinding whole boards can be a process used industrially, but then you would have to treat them prior to using acids, by some other means such as gravity and mechanical separationquote]
thanks butcher that is the info i was looking for im not doing it just researching I don't do anything till ive done a good bit of research on the subject.
curtis
Pantherlikher said:I've been kicking the idea of using a George Forman type burger grill with sand.
The large grill is big enough for mother boards and has raised ,grill like, surface witch sand can fill for a flat surface. It's also slightly tilted forward so solder sinking through the sand can flow out and into a catch pan. I'm not sure how hot they get but should be hot enough for solder.
I also had a wild thought of mylar grilling in this as the melted mylar would drain off leaving the silver traces. But not sure if it would melt or just burn the mylars causing bad fumes.
BS.
Gotta love the cold winter as it puts off great experiments...
g_axelsson said:The solder will not drain away, it is held in place by surface tension.
g_axelsson said:And the idea of leaving silver after melting off mylars doesn't work either, the silver is just a powder that crumbles when the plastic melts and mixes in with the plastic. It is actually silver paint made up of many small grains so it has no mechanical strength what so ever.
Göran
gold4mike said:MMFJ,
I like your "pizza oven" idea and have used a smaller more manual version of it. I use a small electric grill to heat the bottom of the board until I can move parts around on top. I grip the board with pliers, turn it over and thump it on the edge of a large porcelain/metal baking pan. Most of the parts come off and some of the smaller MLCC's and such do, as you mentioned, get stuck in some of the solder that comes off as well.
I'm thinking of building a shear using something similar to a wood splitter as a basis. I envision a large piece of metal with a precise 90 degree angle edge, resting on the surface of the board, then shoving it along the surface, plowing off all the parts into a catch pan at the end.
The board would rest against a stop at the far end of the duty cycle of the ram and lie flat on a heavy steel plate. The distance between the plate and the ram with the metal block would have to be able to be increased or decreased to compensate for the different board thicknesses and the length of the portion of pins that stick through the board on the bottom.
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