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Username Post: Scandi edge vs convex edge        (Topic#840100)
Deer Hunter
Master Member KnifeNut!
*
12-25-08 06:59.55 - Post#1719275    



Hey Guys,

I know some of you have convex the edge of your scandi’s, which do you like the best.

If you had one knife on a backpacking and hunting trip, would you keep the scandi edge or convex edge?

Thanks,

Geoff
 


tstetz
The Puukko Prophet
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12-25-08 07:37.09 - Post#1719290    


    In response to Deer Hunter

Geoff, a lot of Scandi's just end up with a bit of a natural convex over time. I don't deliberately convex my Scandi's, but from hand sharpening it isn't uncommon that you end with the edge being a bit convexed anyway.

So my answer as to which I'd use is: yes
There are some who call me... Tim.

www.woodsmonkey.com


 
TrekWalker
JOTY
*
12-25-08 22:17.07 - Post#1719583    


    In response to tstetz

  • tstetz Said:
Geoff, a lot of Scandi's just end up with a bit of a natural convex over time. I don't deliberately convex my Scandi's, but from hand sharpening it isn't uncommon that you end with the edge being a bit convexed anyway.

So my answer as to which I'd use is: yes


Please excuse my ignorance but I keep hearing this and it puzzles the heck out of me.

If I understand edge geometry correctly, sharpening could not result in a convex edge no matter how slight (unless it's microscopic).

A scandi grind is a continuous bevel down a large portion of the blade (ie; vertically and extending past the tip). To develop a convex edge one would either have to remove a large portion of the blade or have a blade w/a ridiculously short bevel to begin with.

E.g. I own one small mora. About a quarter of the blade is beveled. The blade being rather thin to begin with (like other scandis i've seen) if I were to try to convex the edge i'd probably lose almost a third of the width!

Please educate me. This sort of stuff keeps me up at night. <chuckle>

Peace,

Richard.


 
ssj
Master Member KnifeNut!
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12-26-08 03:46.24 - Post#1719663    


    In response to TrekWalker

Trekwalker-
I think that most of us talk in a bit of code that needs to clarified from time to time. Usually, when we are discussing a convex edge on a scandi, we are referring to a convexed secondary bevel. The primary bevel on the scandi is as you describe
 
ssj
Master Member KnifeNut!
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12-26-08 04:14.55 - Post#1719680    


    In response to TrekWalker

To finish my statement: If you removed a lot of metal as you described, you would have a convexed "blade" and not a convexed "edge." I added a bit to this statement but ran out of time to edit and so lost it. Right now, I don't have the patience to recreate the whole thing and my wife is asking me if I have finished yet. So, I"m off.
Steve
 
PWork
Master Member KnifeNut!
*
12-26-08 04:40.26 - Post#1719695    


    In response to ssj

You can have a flat grind with a convex edge, or a convex grind with a flat edge. It's all in how the edge is applied to the knife.
In turn you can have either a flat or convex grind zero ground to sharp.

IMO, people tend to over think these things. As long as the edge is sharp, it makes little difference.

As always, YMMV.
Paul



 
hollowdweller
Master Member KnifeNut!
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12-26-08 05:15.47 - Post#1719710    


    In response to Deer Hunter

I think that how fine the edge is is more important then the type of grind.

Of course if you get it too fine, scandi, convex or flat the edge can chip or roll. If you get it too steep it won't cut as efficiently.

I think Scandi and Convex seem to be in favor more lately it seems due to the fact that scandis and convex, especially the way Bark River Does them, results in a really fine edge which cuts really efficiently.
WTF?


 
Deer Hunter
Master Member KnifeNut!
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12-26-08 05:19.19 - Post#1719713    


    In response to PWork

Hey Guys,

I have actually taken a file, mouse pad with different grit sand paper and diamond stones to make a convex blade on a #1 and Frosts Clipper.

The scadi bevel is gone. The edge is very thin and strong. It's easy to sharpen and since the work is done by hand, the blade temper remains. The process takes about ½ hour with no breaks.

They cut like crazy and the edge does not roll because of the edge geometry.

I think some others here have also done this and I just wanted to see what they preferred after testing the knives?

Geoff
 
Ragweed
Member KnifeNut!
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12-26-08 05:50.42 - Post#1719723    


    In response to Deer Hunter

Hi,

I think both can be good. But each will be optimal
for slightly different purposes. Other factors being
equal, the convex edge will last a bit longer,
and make deep cuts with a bit less effort. The
Scandi will be a bit keener and is significantly
easier to control when making shallow cuts, such
as when carving wood.
Here's four knives I started using 5 or 10 years
ago. The top two are non-laminated carbon Eriksson,
one with a scandi and one with a convex.
The bottom two are shorter laminated carbon Frosts.
Again, one has a scandi and one a convex
grind. I find the convex to work better in the
packing room where I'm cutting cardboard constantly.
The scandi work better for wood carving, and are easier
to sharpen properly in the field.
The convex blades are now much thinner than the
scandi, but this is a function of a lot more use.
When I first re-profiled them there wasn't much
loss of blade width. I spend a lot more time in
the packing room than carving wood these days.
The Mora I carry in the field has a scandi bevel.
As Hollowdweller says, It's important
to match the final angle to the hardness of the
steel and intended purpose. And as mentioned
by Paul, you can have a slight secondary of either
style. Again, the advantage of a convex secondary is
less resistance, while a flat secondary is easier to maintain
in the field. .
Personally I feel the less secondary the better, unless the
primary angle is too delicate for the steel and purpose at hand.
The big difference for the casual user is that
it’s a lot easier to learn how to sharpen a Scandi bevel.

Best regards,
R
"A knifeless man is a lifeless man."
-Old Nordic Proverb


 
Deer Hunter
Master Member KnifeNut!
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12-26-08 06:32.20 - Post#1719741    


    In response to Ragweed

Hey Ragweed,

I agree. Wow, you really hold on to your knives long and get the use out of them. Anyone who says these scadi knives don't hold up is crazy.

When I convex the blade it keeps the same blade shape. I just remove enough steel to remove the primary grind and get a thin high convex form.

For skinning and processing a deer or other large game, do you like the scandi grind or the convex?

Geoff
 


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