Here’s a shot of the “B.A.D.A.S.S Mofo” prototype. The texturing from the milling and machining will be a little different on the actual production runs.
I’ve tested The heat treating “real hard” and it does a great job of supporting the geometry.
This puppy might just make power hammers obsolete!
Here’s what Nathan said about the heat treating:
“The hammer prototype was made of precision ground annealed and normalized 4150. It was pretty spendy, though the heat treat was simple. Heat to 1200 and equalize (30 min), then austenitize at 1525, also 30 min due to the thick cross section. Quench in room temperature high speed quench oil (with agitation), remove after about 30 seconds and finish in still air (this is like pulling a blade after 8 seconds, still hot). Tempered twice at 400. Estimated hardness HRC 53. I don't own a hardness tester, but it skated a file (under the decarb) before temper. The decarb is probably about .010".
I won't be using that particular steel for production because the raw material cost was $43! Instead I'll be using 4150 directly from the mill. Is it hot rolled, with enormous grain. It will be abrasive sawed into blanks (because it would eat up bandsaw blades to saw cut). It gets annealed at 1650 and air cooled to form fine pearlite, then normalized at something like 1550, then again at 1450 for grain refinement, then a long sphearoidize soak at 1300 to make it more machinable.“ Nathan The Machinist
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(Mr. M.J.)
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Gonna Take You Right
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In Broad Daylight
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On How I Feel
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On Count Of Three
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What You're About
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And To Me That's Really True
But My Friend You Have
Seen Nothing
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But They Say The Sky's
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And To Me That's Really True
And My Friends You Have
Seen Nothin'
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Because I'm Bad, I'm Bad-
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(Bad Bad-Really, Really Bad)
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You Know It
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(And The Whole World Has To
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Just To Tell You Once Again,
(Just To Tell You Once Again)
Who's Bad . . .
We Can Change The World
Tomorrow
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If You Don't Like What I'm
Sayin'
Then Won't You Slap My
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Because I'm Bad, I'm Bad-
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(Bad Bad-Really, Really Bad)
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You Know It
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(And The Whole World Has
To Answer Right Now
Just To Tell You Once
Again . . .)
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(And The Whole World Has To
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Just To Tell You
(Just To Tell You Once Again)
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Bad Baby
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And The Whole World Has To
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(And The Whole World Has To
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Woo!
(Just To Tell You Once Again)
You Know I'm Bad, I'm Bad-
You Know It
(Bad Bad-Really, Really Bad)
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Know-Hoo!
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And The Whole World Has To
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(And The Whole World Has To
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Just To Tell You Once Again . . .
(Just To Tell You Once
Again . . .)
Who's Bad?