S90V Scandigrind Knife

J

JohnCandy

Joined
Aug 5, 2014
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Hello iam looking forward to make a small S90V Scandi-Grinded Knife that will be basically a reinterpretation of the Esee Izula
except that i want to make it a Scandi instead of the normal Flatgrind.

The Thickness of the blade will be about 0.150" in Thickness and basically all around about the same size as the Izula except for a slightly longer handle.
Question now is, how is the feasibility of such a project? I heard that the Angles needed for a Scandi-Grind (about 11°) are kinda critical on S90V-Steel, although i also read about someone having no problems using an Angle of 10-12° per side on this Thread:

http://www.bladeforums.com/forums/showthread.php/776442-Sharpening-S90V?p=8697495#post8697495

So what do you think, guys?
 
Forgot about this one and meant to reply yesterday. I don't know about a scandi grind on that kind of steel in that thickness. If you intend to keep the whole bevel polished and not use a secondary angle, you'll have a lot of metal to remove on a very high wear steel. Heaven forbid you damage the edge somehow. If you intend to use a scandi grind with a secondary micro bevel, you'd be better served to use a full grind and 10-12 dps secondary bevel. If you haven't bought the stock yet, you could go thinner. For that size knife, personally I'd go with 3/32" at the thickest, and ideally 1/16" or even 1 mm.
 
Hi and thanks for replying :)

The Steel is already bought and is soft annealed so that working it isnt that hard.
I already heard that a Flatgrind would be the better option with this steel and although i really love the appeal of a Scandi-Grind iam good to go flatgrinding it, just a few minor questions left :D


Usally on a flat-ground blade the thickness diminishes going down from the back of the knife, but what is the angle like on that?
For example on a Spyderco-Knife?
I guess it would be about 3-5degress per side going straight down from the back of the knife, onto the bottom where the real bevel will be at with about 20° per Side and 40 in Total?

I know that Spyderco used S90V on some models, what Angle did they use? I guess it should be about 30-40° in total?

Hope you can help me out there, iam kinda new to flat-grinding knifes :)
 
I don't think high carbide steel suit for zero edge/scandi kind of grind. You'd better bet on steel like 1095, O1 or 52100
 
The grind angle is nearly irrelevant in comparison to the angle to which you choose to sharpen. With that said it is contingent upon the thickness of the spine, width of the blade and thickness of the edge prior to sharpening. If you can post those dimensions, I'll give you an angle.
 
A lot of aspiring knife makers, who are headed the right direction (like John Candy), have their eye properly set on geometry. And as such, the new knife maker asks himself, "what should the angle of my bevels be?" I asked the same, quite often when beginning, until I realized that the thickness of the steel, and how tall (wide) the blade is automatically determines what the bevel angle is going to be. And as such, the knife maker never needs to worry about the actual bevel angle number, as long as he is conscience of the proper steel thickness for the job intended, and how tall he wants the blade to be. The only angle numbers that really need to be taken into account are the final edge angles, when sharpening is done. Carbonsteel sais basically the same now that I re read it.

Also, I agree with some of the other comments. For a true scandi style blade and edge, high carbide steels probably aren't the best choice. A role best suited for finer grain steels, as mentioned. 1095 52100 W2 and the like.
 
Iam an Izula-Owner and use it as a template although the handle will be complettly custom and quite different, but that should'nt really matter i guess.

The Idea behind this was that i wanted a knife as handy as an Izula with a bit beafier grip and a scandi-grind that has more bite when it comes to light wood work without loosing it's edge, and that could be used for fishing, therefore rust-resistent.
Although i didn't think about the acute Angle and the therefore problematic use of S90V, so that i have to use a flat grind whether i want it or not.

The thickness of the blade is 0.150inch and the height is 1.18inch on the back.


Iam already thinking about another steel for the next knife, i think N690 should be kinda nice.
It doesn't rust, is quite wear-resistent and has no problems with acute angles as in a Scandi-Grind.


Thank you all for your help!
 
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With a .150 spine, 1.18 blade width and taken to .002 before sharpening, you're looking at ~6° (3°/3°) . Of course this assuming that you do a full flat grind without thinning the spine.
 
And it seems most knives, as long as they are in this general size category, are going to have bevel angles of around 3 degrees per side, as carbonsteel928 pointed out. I love Trig. I use that math daily. Sine Cosine and Tangent are our friends! SOHCAHTOA!!!!!
 
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