[TheForge] Fw: Fw: Hay cutter blades.

[Andy Gladish]

fricken awesome, thanks for the info, Jason- can't wait to try this...so you 
need to apply extra heat as the edge cools?
--------------------------------------------------
From: "Jason Nass" <me at wargoth.com>
Sent: Monday, September 27, 2010 10:00 AM
To: "'Blacksmithing List Sponsored by ABANA'" <theforge at mailman.qth.net>
Subject: Re: [TheForge] Fw:  Fw:  Hay cutter blades.

> A temper line or to use the Japanese term Hamon has little to do with the
> quenchant and far more to do with the heat treating process itself. It 
> comes
> from the blade having what is called a differential temper, and is the 
> point
> in the steel where the crystalline structure changes from hard to soft. I
> can't remember specifically off the top of my head which exactly they are,
> but martensite and pearlite seem to jump to the forefront of my brain.
> Regardless of that however, a hamon is produced by method of rapidly 
> cooling
> the edge while allowing the sine to cool slower. The Japanese swordsmiths
> achieved this by means of painting the blade in refractory clays which 
> were
> thicker towards the spine which when quenched would insulate it causing it
> to cool considerably slower than the edge. A similar effect can be 
> achieved
> by submerging your initially tempered edge in water while heating the 
> spine
> to draw the temper back further. One other note is that a hamon usually 
> will
> not appear or will be muddy, buff the blade to a polish, the polish must 
> be
> achieved by progressively finer abrasives worked by hand, I believe this 
> is
> caused by the heat a buffing wheel generates, but again, my memory isn't
> always spot on and it could be another factor entirely. Hope this helps,
> while I am by no means an expert on the subject, I have successfully 
> managed
> to produce 2 blades in the traditional Japanese methods, and if I can save
> you some headaches down the road, I'd be happy to share my findings.
>
> Jason Nass - me at wargoth.com
>
> -----Original Message-----
> From: theforge-bounces at mailman.qth.net
> [mailto:theforge-bounces at mailman.qth.net] On Behalf Of Mark A. Pesetsky
> Sent: Monday, September 27, 2010 12:08 PM
> To: Blacksmithing List Sponsored by ABANA
> Subject: Re: [TheForge] Fw: Fw: Hay cutter blades.
>
> No
>
> -----Original Message-----
> From: theforge-bounces at mailman.qth.net
> [mailto:theforge-bounces at mailman.qth.net] On Behalf Of Andy Gladish
> Sent: Monday, September 27, 2010 11:52 AM
> To: Blacksmithing List Sponsored by ABANA
> Subject: Re: [TheForge] Fw: Fw: Hay cutter blades.
>
> Consumer warning: Noob question inbound!
> Do you have to use water to get a good hamon line?
> Andy G
>
> --------------------------------------------------
> From: "Mark A. Pesetsky" <pesetsky at Princeton.EDU>
> Sent: Monday, September 27, 2010 7:43 AM
> To: "Blacksmithing List Sponsored by ABANA" <theforge at mailman.qth.net>
> Subject: Re: [TheForge] Fw:  Fw:  Hay cutter blades.
>
>> Habit from being a hamon guy:)
>>
>
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