Fun with scrap ( diamond coated stainless disks )

At the scrap yard they had a tri-wall container with a bunch of stainless s teel disks. 4.25 inches in diameter and 5 mm thick and coated with diamond
. The disks are used to flatten silicon wafers. They came from DuPont. T he back side has a few holes , some tapped to hold the disks on something.
To flatten silicon wafers they need to be pretty flat. They are not perfec tly polished. But can almost be wringed together dry. With a little spit on them they wring together so well you can not pull them apart. You have to slide them so there is little area holding them before separating them.
Dan
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At the scrap yard they had a tri-wall container with a bunch of stainless steel disks. 4.25 inches in diameter and 5 mm thick and coated with diamond. The disks are used to flatten silicon wafers. They came from DuPont. The back side has a few holes , some tapped to hold the disks on something.
To flatten silicon wafers they need to be pretty flat. They are not perfectly polished. But can almost be wringed together dry. With a little spit on them they wring together so well you can not pull them apart. You have to slide them so there is little area holding them before separating them.
Dan =================== Also wafers break like glass with similar sharp edges. -jsw
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Dan - er, where's your scrap yard?
Hul

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On Saturday, March 25, 2017 at 6:29:33 PM UTC-4, Hul Tytus wrote:

The scrap yard is Diamond Recycling in Wilmington, De.
I have not had great luck mailing these. The disks weigh about a lb each and eight will fit in a small priority box. But I could try again.
Dan
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Dan - it's nice to hear of real scrap yard rather than the auto parts only versions. Wilmington's a bit too far from here (Cincnnati) but I will keep it in mind.
Hul

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wrote:

The problem up here is NONE of the "scrap yards" other than automotive wreckerswill allow you in or allow you to buy ANY scrap out of the yard. - sadly - because there is still a LOT of industrial scrap here.
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On Sunday, March 26, 2017 at 6:39:39 PM UTC-4, Clare wrote:

My neighbor's brother use to work at the scrap yard so I had a bit of an in . And then for at least the last three years , I have gone to a local groc ery and bought a bunch of muffins, soft drinks, and what ever seemed approp riate and took it to the scrap yard on the last day before Christmas. This last Christmas I included 3 bottles of Irish whiskey. So they know me by my first name.
And I am pretty cautious when I am out in the yard. They have a bunch of m obile cranes, 18 wheel trucks and fork lifts.
But I have bought a reasonable amount of stuff there. Large Parker Vise, J ohn boat, aluminum canoe, 2 ton cherry picker, some CO2 tanks.
Dan
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On Sunday, March 26, 2017 at 6:12:29 PM UTC-4, Hul Tytus wrote:

Well if you are ever in the vicinity, contact me. I am in the book.
Besides the scrap yard, there is a bunch of Du Pont stuff. Hagley is where they made black powder. It is 100 plus acres and has a line shaft operated machine shop. The line shaft can be driven by an electric motor or a water turbine.
Nemours Mansion is Alfred DP 's home. It is also on a good sized lot. They did a 20 million dollar refurbishment a few years back.
And there is Winterthur, another Du Pont estate turned into a place to visit.
And nearby is Longwood Gardens. Yep another DuPont estate.
And the Delaware Museum of Natural History. And the Delaware Art museum. The Belanca Museum. All with some ties to the Du Ponts
And a train station on the New York ------Washington D.C. line. My wife came back today from N.Y.C.
Have lunch or dinner at the Du Pont hotel. And walk from my house to a micro brewery/pub or go up to PA and visit the Victory Brewery/pub.
Dan
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Hul Tytus wrote:

> I will keep it in mind.
I don't know if they still resell metal, but Mose Cohen in Middletown, Ohio (45042) used to have separate scrapyards for vehicles and scrap metal. I used to deal with them, but that was over 30 years ago.
The vehicles were in a lot on Yankee Road.
They recently bought the old Crystal Tissue Paper mill on S. Verity Parkway, a couple blocks from Oxford State Road. Parts of Verity had been the Miami-Erie Canal that was filled back in.
Is Carthage Auto Parts still around? I had to use them to get an exhaust manifold for a Chevy 292, back in the early '80s. No one else had one.
--
Never piss off an Engineer!

They don't get mad.
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