They are screwed to the aluminum on circuit boards. Are they brass? Been hold on to them try to figure out what to do with them.
http://i1280.photobucket.com/albums/...psan5vb3ny.jpg
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They are screwed to the aluminum on circuit boards. Are they brass? Been hold on to them try to figure out what to do with them.
http://i1280.photobucket.com/albums/...psan5vb3ny.jpg
those are transistors. the back is Cu.
Eric
My yard won't take them. Wish they did!
Saving mine up until I find a free tumbler and going to cash in then. Mike
Save them up until you get enough to justify shipping expense, &/or package them with other circuit boards you send for recycling.
You can get $1.00 - $1.50/lb. for them from SMF Buyers.
A tumbler. Will that take the black off?
So will tapping them with a hammer, It's like a Bakelite and will shatter.Quote:
Originally Posted by kcscrapper
I put several handfulls in a metal tin with a lid on it and roasted them in a pit fire for a while.
Then I opened it and seived the black powder off
using a microwave door as a mesh seive.
It worked well. Less air in the tin equals less oxidation of the copper.
Some black plastic stayed stuck. Not much and they can go for a second burn anyway.
What I did notice was that any circuit, board still stuck to the legs stayed there and its better to do a lot at a time.
Seive and magnet to make sure there's no iron in there either.
My yard let me throw them in with the #3 copper wire.
Not so much one setup for tumbling but if you over speed the tumbler motor or gear ratio you get more of a wave action inside the drum. then yes. overspeed and steel ball bearings would clean them in a larger sized tumbler no problem (need the drop distance in the drum to be about 6-8 inches). Although there would be some dust you wouldn't want to breathe left over and running a tumbler dry with metal inside is not only noisy but quite destructive to your barrel.Quote:
Originally Posted by kcscrapper
wouldn't recommend a wet tumble here;)
"wouldn't recommend a wet tumble here"
Why not? Mike
Three main reasons
water is mainly added to stop chipping and breaking.
water will add days if not weeks to this process
the weight of the water will off balance the tumbler too much when it's over sped. (think of an unbalanced washer on spin)
another small reason is, adding water and smashed up components together and mixing them "could" create gases. In this case it might be ok but i can't say that for sure, they already have a funky smell when you tap them with a hammer.
My though on using a tumbler is to avoid smacking each one with a hammer, too much work for the return for me. Perhaps a different media would work better, something like heavy bolts and nuts, having sharper edges? Mike
same here but i have to smash off the plastic/Bakelite coating first.Quote:
Originally Posted by foobar
its not hard but i do tend to hit my fingers quite a bit when doing that.
These would work well and are always available, one downside to rough media is faster barrel wear. heavy ball bearings or pinballs would work the best IMO. magnetic media is the real key for easier separation at the end. One thing I can tell you from experience is running a tumbler dry and full of metal is going to be really loud.Quote:
Originally Posted by miked
a cement mixer is another excellent tool for projects like this.