Delta 3v Recipe exclusive or shared?

Nathan the Machinist said:
I can't speak for Guy. I can say that there are some potential pitfalls when utilizing the Delta protocol in 3V. Since you're not able to convert retained austenite by using the secondary hardening hump it is quite sensitive to quench rate/depth and cryogenic timing which are variables that can be difficult to control depending on the section of the steel being quenched and the design and layout of the oven and it is also sensitive to heat generated during subsequent processing. I think it might not always play well with manufacturing processes that start with heat treat before grinding the primaries, substantial hard grinding and dry powered sharpening. Simply put, Delta 3V may not scale up very easily and their volumes are much bigger than mine. Outside of the heat treat itself, it almost requires certain manufacturing steps be carried out in a certain order which isn't highly compatible with the most common forms of knife production. Avoiding problems almost requires a different approach, which isn't for everyone.

A discussion stated when I saw an example of some work on IG that did not appear to me to demonstrate the edge stability that we strive for with this process (it's the whole purpose of this process) so I called Guy on the phone. In my discussion with him it sounded like they were dealing with some inconsistencies in the results and they finally made the decision to step back a bit into an older approach to their heat treat. I'm disappointed they're moving away from the Delta protocol. It offers a lot of value and in my opinion the "juice is worth the squeeze" but I'm glad they were able to recognize their manufacturing processes might not be fully compatible with the protocol and move to something that works for them. It's a lot harder to overheat something heat treated utilizing the secondary hardening hump. The last thing that I want is for work that is marked with the Delta symbol to have heat treat issues, so I'm glad they were paying attention and addressed it before it became a problem. This is one of the things I like about Guy and got us working together on 3V heat treat in the first place, we both test our work and look for problems. It's a shame he's abandoning the process because it really was a very valuable asset and I think it's insane not to utilize it, but I also understand that at some point every maker has to look at their business and decide what aspects of their operation are moving them where they want to be and what things are holding them back. Again, I can't speak for Guy, but I know that a lot of people were drowning in 2020 and I imagine that his calculus showed him that the changes needed to reliably implement the Delta protocol wasn't for him.

I haven't tested any of his recent work, but knowing Guy I'm sure he's putting out a good product.
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But gso6 and part of gso7 have Delta symbols, do they have performance issues? Thank you Nathan！
 
It's 3v but I think I tasted egg.. and some cinnamon
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70_kylin said:
Guy never replied to me, and nathan seemed to help survive! So I asked, and I'm sorry for that😭
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No need to apologize for an honest question. It's just an unwritten code that most makers won't critique other makers unless they have something positive to say. *

(Their not saying anything at all shouldn't be construed as being negative...but simply avoiding the potential pitfalls that can arise from these situations.)

* I do not speak for Nathan...I am only speaking from my own experience in this arena over some decades.
 
Blues said:
No need to apologize for an honest question. It's just an unwritten code that most makers won't critique other makers unless they have something positive to say. *

(Their not saying anything at all shouldn't be construed as being negative...but simply avoiding the potential pitfalls that can arise from these situations.)

* I do not speak for Nathan...I am only speaking from my own experience in this arena over some decades.
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I see. Thank you for your kind reply，you are a good man😙
 
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