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by Karl_H
Sun Sep 13, 2020 8:23 am
Forum: Spyderco General Discussion
Topic: Stable edge steels (NOT TOUGHNESS)
Replies: 34
Views: 1097

Re: Stable edge steels (NOT TOUGHNESS)

Larrin provides a very thorough explanation of toughness and chipping in this article: https://knifesteelnerds.com/2018/05/28/ ... -of-edges/

If you really want a deep understanding of edge stability, it is worth your time to read all of Larrin’s online articles on this subject or read his book.
by Karl_H
Tue Sep 08, 2020 9:09 pm
Forum: Spyderco General Discussion
Topic: Stable edge steels (NOT TOUGHNESS)
Replies: 34
Views: 1097

Re: Stable edge steels (NOT TOUGHNESS)

“Edge stability” is a function of edge geometry, strength, and toughness. As far as I am aware, there are no well controlled edge stability tests for Spyderco knives. Larrin’s graphs that plot toughness vs. hardness (on knife steel nerds) are probably the best available resource for comparing differ...
by Karl_H
Mon Sep 07, 2020 8:58 am
Forum: Spyderco General Discussion
Topic: So what's your top 3 favorite steels? and why?
Replies: 220
Views: 18280

Re: So what's your top 3 favorite steels? and why?

I will try to keep this relatively generalized and group similar steels into broad categories. 1) Category: High-strength (64-67 HRC), low chromium (4-6%), low carbide (6-8% hard carbide) PM tool steel clad with softer, low carbide stainless steel (aka san mai construction). Examples: HAP40/SUS410 R...
by Karl_H
Sat Sep 05, 2020 10:46 am
Forum: Spyderco General Discussion
Topic: How do you carry your knives and why?
Replies: 47
Views: 1261

Re: How do you carry your knives and why?

Most often in my fifth (coin) pocket. The fifth isn't very useful for anything else, but it is perfect for small to medium sized folding knives. If I have a climbing harness on, a drop pocket on the side is preferred. For small fixed blades, I prefer horizontal belt carry, usually behind the back. I...
by Karl_H
Fri Sep 04, 2020 7:33 pm
Forum: Spyderco General Discussion
Topic: Deep carry clips
Replies: 23
Views: 518

Re: Deep carry clips

I wouldn’t say invisible, but less conspicuous. If the clip is flush with or extends beyond the scales, it is more likely to create a hot spot, when using a saber grip. I personally prefer to have the top of the clip flush with the end of scales. The mini Bugout has the best clip of any pocket knife...
by Karl_H
Fri Sep 04, 2020 1:19 pm
Forum: Spyderco General Discussion
Topic: Predictions for Reveal 6
Replies: 65
Views: 2667

Re: Predictions for Reveal 6

Notsurewhy wrote:
Fri Sep 04, 2020 1:16 pm
Pie in the sky:
- a regular production cruwear chief in a nice burgundy micarta or g10.

Maybe somewhat realistic:
- Lil native back lock salt in lc200n
I hope both predictions come true :)
by Karl_H
Tue Sep 01, 2020 9:11 pm
Forum: Spyderco General Discussion
Topic: HRC Database
Replies: 205
Views: 24954

Re: HRC Database

I just got a Delica k390. The results were a bit surprising. It was poked twice, with the results of 66.4 and 66.5 HRC I am also curious. If these results are accurate, it makes me wonder about the heat treatment and toughness. I believe the previous K390 results were about 65 HRC, which is more in...
by Karl_H
Thu Aug 27, 2020 12:13 pm
Forum: Spyderco General Discussion
Topic: Demand and Supply of New Salt Series Knives?
Replies: 28
Views: 882

Re: Demand and Supply of New Salt Series Knives?

I've cleaned most of my knives that way, even the non-Salt models without any corrosion issues. I'm not sure I want to pay more for a full Salt knife if I don't have the need. +1 I clean all of my knives with soap and water, without issue. I just wipe it down, after washing. With tool steels, I wil...
by Karl_H
Thu Aug 27, 2020 11:30 am
Forum: Spyderco General Discussion
Topic: Rex45=Hap40?
Replies: 26
Views: 771

Re: Rex45=Hap40?

I wouldn't worry too much about the maximum allowable contaminants (S, P, etc.) in the material specs for knife steels, particularly HIP PM steels. The PM process essentially prevents large non-metallic agglomerations from forming and inter-granular corrosion is not a major concern for knife use. I ...
by Karl_H
Sun Aug 23, 2020 9:34 pm
Forum: Spyderco General Discussion
Topic: Where does SPY27 Steel sits among the current Steel lines?
Replies: 33
Views: 2116

Re: Where does SPY27 Steel sits among the current Steel lines?

While I don’t have an issue with the steel, the current pricing isn’t very attractive. I would be more excited if SPY27 replaced S30V, without a big price increase. If you primarily value corrosion resistance, BD1N is a better option. If you want fine edge stability, REX 45 is a better option. S30V ...
by Karl_H
Sat Aug 22, 2020 9:07 am
Forum: Spyderco General Discussion
Topic: Where does SPY27 Steel sits among the current Steel lines?
Replies: 33
Views: 2116

Re: Where does SPY27 Steel sits among the current Steel lines?

What CATRA does not measure is the front end edge retention, especially through non abrasive materials, such as clean cardboard, cloth, tape, plastic, etc. The CATRA test generates a full sharpness loss curve. It tests every stage including “front end.” Understood. With a CATRA machine, is there a ...
by Karl_H
Sat Aug 22, 2020 8:53 am
Forum: Spyderco General Discussion
Topic: Where does SPY27 Steel sits among the current Steel lines?
Replies: 33
Views: 2116

Re: Where does SPY27 Steel sits among the current Steel lines?

Larrin’s articles are probably your best port of call, if you haven’t read them yet: https://knifesteelnerds.com/2020/01/15/spyderco-exclusive-cpm-spy27-steel-analysis/ https://knifesteelnerds.com/2020/03/02/cpm-spy27-experiments-toughness-corrosion-resistance-and-more/ +1 However, it should be not...
by Karl_H
Sat Aug 22, 2020 8:13 am
Forum: Spyderco General Discussion
Topic: so where's rex45 going anyways?
Replies: 16
Views: 711

Re: so where's rex45 going anyways?

I hope REX45 stays in production. For the blades that Spyderco currently offers Maxamet in, I think REX45 would be a better option for most people. But I would be happy to see any hard & tough PM tool steel stay in regular production or perhaps continuous cycling sprint runs of different tool steels...
by Karl_H
Mon Aug 17, 2020 7:46 am
Forum: Spyderco General Discussion
Topic: Native Chief LW FRN
Replies: 12
Views: 1011

Re: Native Chief LW FRN

Yes, but... I hope they put some effort into designing contoured, rounded scales with shallow texturing. I really dislike the flat slabbed, "bi-directional" texturing on the FRN Native 5. I don't need or want deep cleats. There is no good reason for injection molded scales to be flat or have sharp e...
by Karl_H
Fri Aug 14, 2020 10:49 pm
Forum: Spyderco General Discussion
Topic: Corrosion resistance for food prep
Replies: 7
Views: 729

Re: Corrosion resistance for food prep

As long as you can keep the pivot area dry/oiled, I don’t think steel corrosion resistance matters very much. I prefer the 5-8 Cr PM tool steels for folding knives (and stainless cladding, if it is an option). I generally do not have issues keeping the pivot area dry or well oiled.
by Karl_H
Thu Aug 13, 2020 2:38 pm
Forum: Spyderco General Discussion
Topic: Clips you don’t like do not constitute a fatal flaw
Replies: 44
Views: 1849

Re: Clips you don’t like do not constitute a fatal flaw

A clip that you don't like can absolutely affect your willingness to buy or use a knife. Why buy a knife with a pocket clip that you don't like, when there might be another knife that has better options? In general, I think Spyderco often treats clips as an after thought. The Swayback is a prime exa...
by Karl_H
Thu Aug 13, 2020 10:47 am
Forum: Spyderco General Discussion
Topic: Odds of more choil-less designs
Replies: 30
Views: 1102

Re: Odds of more choil-less designs

Sal has indicated that Spyderco will be watching Rock Jumper sales to determine whether or not they should release more choiless designs. I believe he also mentioned working on a choiless Shaman variant. It is slightly over 3”, but I would say that the Ikuchi is a choiless design worth checking out.
by Karl_H
Tue Aug 11, 2020 11:53 am
Forum: Spyderco General Discussion
Topic: Which Spyderco stainless is least prone to accidental edge damage?
Replies: 42
Views: 4183

Re: Which Spyderco stainless is least prone to accidental edge damage?

Larrin Thomas (Knife Steel Nerds) has a lot of good articles on edge retention and stability. TLDR: Edge stability, as the term is normally used is a function of applied stress, geometry, strength (hardness), and fracture toughness. Edge retention, as the term is normally used, is a function of geom...
by Karl_H
Mon Aug 10, 2020 12:08 pm
Forum: Spyderco General Discussion
Topic: Give The Spyderedge A Chance Thread
Replies: 179
Views: 8241

Re: Give The Spyderedge A Chance Thread

Ikuchi and Native Chief
by Karl_H
Mon Aug 10, 2020 10:48 am
Forum: Spyderco General Discussion
Topic: Interest for an all Titanium Ikuchi?
Replies: 28
Views: 1987

Re: Interest for an all Titanium Ikuchi?

I would be most interested in a serrated variant (for cutting on hard surfaces). This is a light use design that is best suited for slicing food. A cheaper more corrosion resistant steel, like BD1N makes the most sense to me. Cheaper G10 or FRN scales with shallow (but not smooth) texturing would al...

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