A "hydrid" spydie?? Thoughts..

Kaizer · #1

Dear All,

Here's something that occured to me in a dream. I just want to share it with you all and would appreciate your inputs.

Currently all spydies come with *one* blade grind that runs the entire length of the "business" side.

Now just suppose we had a hybrid spydie with more than one type of grind on the blade? Would it be practical to carry around a <img src="spyder.gif" width=15 height=15 align=middle border=0> that has two, maybe three types of grinds? The position of the grinds would need to be though out. For instance, if a certain grind is good for piercing, it should be put logically on the area near the blade point. Another type of grind that is good for whittling (say) should be put near the kick.

How about it? I'm interested in your thoughts on the practicality, not concerned about whether it is too expensive / complicated to do it. A "thought experiment" if i may say so.

Thanks and have a nice day.

Kaizer.

A door half open is a door half closed. But a knife half open is a knife fully closed.

dialex · #2

Hi, Kaizer. I had a slightly similar idea once. I designed a knife (my first Raptor model) with a variable grind, thicker at the tip and thinner at the base, on the consideration that it would improve piercing and then cutting. But after that I switched it to a more classical hollow / flat ground. I don't know how would it really perform your blade model but I think that someone with technical possibilities could try it.

glockman99 · #3

I might be wrong, but didn't the "early" police model come with 2 different grinds (on the same blade)?

Dann Fassnacht Aberdeen, WA glockman99@hotmail.com ICQ: 53675663

Knife Knut · #4

Plainedge/SpyderEdge has been around for years.
I think the majority of ELU dislike Combination edges; The Dyads cater to this.
A 50/50 VG-10 Police w/ stainless handle hit the market a short while back.
The Renegade and Black Hawk are 50/50
Chinook can be is 60/40.
Native available in 50/50
There are many more examples.

I have seen the whittling edge near kick discussion a few times, but do not know of any knives that are made like this. I think it might be rather disruptive to the esthetics.
Not to mention the average ELU probably would not like to deal with three different edges to sharpen; me, I would have a different knife, or just make do with what is available.

If you meant to type thicker at the base, thinner at the tip, your "variable grind" sounds to me like what is called "distal taper" All of Spyderco's Flat ground blades display this characteristic.
If you did type what you meant, that might make for a weak blade breaking off at the base.

I often find mysef coming up with ideas, only to find them alredy existing.

Knife Knut on a shoestring budget.

JamesA · #5

I believe the Bob Lum Tanto had a hollow (maybe flat, can't recall) ground edge and a convex ground tip.

Knife Knut · #6

Yes, that is the case, JamesA.
I cannot recall the particular Japanese term for the specific grind the tip uses, but it translates as appleseed, which is what the cross section of the grind is shaped like.

Knife Knut on a shoestring budget.

Kaizer · #7

Hi Knife Knut
I believe the japanese term is hamagiri?

Thanks to all for your inputs though!

Kaizer

A door half open is a door half closed. But a knife half open is a knife fully closed.

Joe Talmadge · #8

http://www.ragweedforge.com/2000.jpg

Scandinavian single-bevel grind near the hilt, excellent for whittling, etc.

Full flat grind near the tip, for your general slicing needs.

dialex · #9

I think that the term is "hamaguri" = appleseed. Quite suitable for punching through harder materials (metal, wood, even stone)

liko · #10

I think it would be cool to see a varying grind in a Spydie. Take the saber grind, start with flat grind at the kick and, as you move toward the tip, belly the grind more.

However, there are real problems with doing this in a production knife. A grind is just that, done on a grinder. Changing the grind profile requires a change in the diameter of the wheel (drum, belt, etc) in the grinder. A custom knifemaker would be able to take the time to vary the grind. When Spyderco makes dozens of each type per day, that's just not feasible.

Knife Knut · #11

Liko, that reminds me of something.

At the 2002 Blade Show I asked one of the laser cutting outfits something:
Would it be possible to cut bevels with a 5 Axis cutting setup.
He said yes.

Knife Knut on a shoestring budget. RKBA

dialex · #12

! <img src="smile.gif" width=15 height=15 align=middle border=0>

I'll be back!

dialex · #13

I was thinking Kazer is back... <img src="sad.gif" width=15 height=15 align=middle border=0>

I'll be back!

Carlos · #14

Here is a Spyderco / Bob T concept knife from many years ago. The blade is 1/2 flat ground and 1/2 hollow ground.

dialex · #15

Strange!

I'll be back!