MagnaCut customs - Books Closed

David Mary

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After some time considering Larrin's toughness comparison charts, I have come to the conclusion that a hardness of 62-63 RC is the right choice for all of these knives, big and small. The only thing that could possibly be an issue, in my opinion, is super fine tips being a little bit brittle, but this is the case with just about any steel that is hardened to a high level. And when they are too soft, they are prone to bending, so in the end, I feel that harder is better, and if a fine tip is desired for a hard use knife, it should be fine in profile, but with a slightly thicker cross sectional thickness to increase robustness.

If anyone with a custom coming from me in this steel desires a different hardness, feel free to reach out to me via email or PM and let me know while we still have time before Jarod cooks the blades for us. Thanks!

Toughness chart.jpg


Quick note: None of the knives I am doing in this steel are choppers. I would not want to do a chopper in MagnaCut, but AEB-L instead.
 

David Mary

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An update is due on this thread, as it's been a while. Jarod's wife has been involved with a lot of the logistics that keep orders moving, but been less involved in the business lately because of this:
https://www.bladeforums.com/threads/much-appreciated-shop-addition.1794071/

And Jarod has had other unexpected stuff going on as well but I know he's doing his best to keep up, while also juggling his full time job. His quality has always been worth the wait.

~62.5 looks perfect!

I have reevaluated my thoughts on this after Jarod and I recently discussed the heat treatment. He made a compelling case for going a little tougher, given this steel is new, and he has not heat treated much of it yet. Considering the heaviness of the blades, and the thin geometry I am planning for their edges, I agreed with his suggestion. We have opted to play it safe with 60-61 on these. Based on the chart, this should give us slightly better toughness than AEB-L at 63 RC, which I think will work quite well, and we're still expecting much better corrosion resistance and edge retention than AEB-L at that hardness also. So they are now fully heat treated and tempered, and I am advised they should be hitting the last stage before shipping tomorrow, which is surface grinding.

Thanks everyone for your patience and understanding.
 

Currawong

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An update is due on this thread, as it's been a while. Jarod's wife has been involved with a lot of the logistics that keep orders moving, but been less involved in the business lately because of this:
https://www.bladeforums.com/threads/much-appreciated-shop-addition.1794071/

And Jarod has had other unexpected stuff going on as well but I know he's doing his best to keep up, while also juggling his full time job. His quality has always been worth the wait.



I have reevaluated my thoughts on this after Jarod and I recently discussed the heat treatment. He made a compelling case for going a little tougher, given this steel is new, and he has not heat treated much of it yet. Considering the heaviness of the blades, and the thin geometry I am planning for their edges, I agreed with his suggestion. We have opted to play it safe with 60-61 on these. Based on the chart, this should give us slightly better toughness than AEB-L at 63 RC, which I think will work quite well, and we're still expecting much better corrosion resistance and edge retention than AEB-L at that hardness also. So they are now fully heat treated and tempered, and I am advised they should be hitting the last stage before shipping tomorrow, which is surface grinding.

Thanks everyone for your patience and understanding.

Lower RC sounds like a reasonable alternative. I didn't realise it could be made tougher than AEBL. If Magnacut can be a 'super AEBL' (tougher, more stainless, better edge holding) that's extraordinary.
 

David Mary

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AEB-L is tougher than MagnaCut, but like any steel, loses toughness as it gains hardness. AEB-L at 63 is pretty tough for a stainless steel, but I have been able to make it fail in certain tests involving hard use and thin geometry (i.e. chopping dry hard wood chipped out a thin AEB-L edge at 63 RC). So MagnaCut at 60-61, which reports a slightly higher toughness than AEB-L at 63 seems prudent to me, and will still get thin geometry, but I will probably opt for more robust microbevels. I'm going to grind and test my own MagnaCut blade first before I do the commissions.
 

jstn

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An update is due on this thread, as it's been a while. Jarod's wife has been involved with a lot of the logistics that keep orders moving, but been less involved in the business lately because of this:
https://www.bladeforums.com/threads/much-appreciated-shop-addition.1794071/

And Jarod has had other unexpected stuff going on as well but I know he's doing his best to keep up, while also juggling his full time job. His quality has always been worth the wait.



I have reevaluated my thoughts on this after Jarod and I recently discussed the heat treatment. He made a compelling case for going a little tougher, given this steel is new, and he has not heat treated much of it yet. Considering the heaviness of the blades, and the thin geometry I am planning for their edges, I agreed with his suggestion. We have opted to play it safe with 60-61 on these. Based on the chart, this should give us slightly better toughness than AEB-L at 63 RC, which I think will work quite well, and we're still expecting much better corrosion resistance and edge retention than AEB-L at that hardness also. So they are now fully heat treated and tempered, and I am advised they should be hitting the last stage before shipping tomorrow, which is surface grinding.

Thanks everyone for your patience and understanding.
I think 60-61 will be perfect in this steel and well worth the wait! BTW, I was doing a lot of cutting today with a new production fixed blade I just bought, and both the stock thickness and edge thickness were ridiculously obtuse, making cutting a chore. Luckily I had my David Mary custom Street Beat Tribute in my car. I went and grabbed it and it made short work of all of that cardboard. You do a fabulous job with your grinds, David, and you saved me some work today!
 

David Mary

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Yesterday, I was informed that the MagnaCut blades were slow to surface grind. Jarod said that they seemed to grind like M2 or D2. Looks like I'm in for some pain when it comes time to grind these. 😬 🤷‍♂️ 😅

I haven't received the ship notification yet, but will update this thread once I do.
 
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