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Howdy guys,
Today I have two new blades for your consideration.
First is a file given to me by Owen Bush when my class with him ended, reforged into a fighter similar to his own seax style with a twist. Blade was normalized, forged, annealed & drilled, normalized, differentially hardened, then double tempered to a delicious gold color at 395F/202C. The fittings are low layer damascus that's been etched then lightly repolished so only the topography shows, with steel pins, brass spacers, ebony and mosaic pin.
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I live in NYC, so when the blade was finished I just ran it over to Bill at MastersmithS, where it was added to his collection and soon to be on his website - only my second accepted knife! Here's Bill with it:
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The second is a damascus utility knife of old jackhammer bit steel (S-5?) and mild steel that I had forged a while ago in London (at Shelley Thomas' forge), but never handled until back in the States; handle is bamboo with mosaic and brass pins. The blade is differentially hardened tempered the same as the first; but has a small cold shut that I am not thrilled with, yet doesn't effect its cutting ability.
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I'd love to hear what you guys think,
Theo

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Machinery's handbook says that the S series would make good jackhammer bits and that morphed into many junkyard steel lists stating that jackhammer bits were made from S series steel.

However as has been posted here before:
From Grant:
JACKHAMMER bits have a hole down the center and go in a percussion drill (jackhammer). Paving breaker bits are solid and go in a paving breaker. Yeah, I know, most people call 'em jackhammers. Having owned a company for 18 years that produced millions of them probably makes me a little pickier than most. For me, if a customer ordered a 1" x 18" jackhammer bit, I had better send the right thing.

As an aside to this, I've had just about every bit made spectrographed and never found one made from a tool steel. The largest manufacturer (Brunner & Lay) uses a modified 1045 for all their bits. Vulcan used to use 1078 (a high silicone 1080) but have changed to a boron steel in the last few years. Most others (Delsteel, Pioneer, Ajax, Tamco) use either 1078 or 9260. I Had good success using 8640. You only have to remember that B&ampampL is water quench and the others are oil when you use them to make other tools.

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Cool, thanks! If it was something more exotic that might explain the cold shut... though damascus is new to me and I need more practice as well.
I had patternwelded a bundle of billots of the same mix before leaving the UK, which I'm now using entirely for fittings because it uses mild steel.

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