Do you use two different edge geometries on 2-blade folder?

[deltablade]

A comment some time back peaked my curiosity, as a old hunter and woodsman commented one day that he put a steeper edge angle on one blade of his bullet type knife, the one he used for general purposes, and a flatter edge on the other blade, that he used for delicate work like skinning and whittling. Have any of you heard of this concept, and maybe do it yourself?

 

[Arathol]

That absolutely was a thing some years ago. Case for instance did some spey blades like this

 

[JWright214]

I put different edge angles and finishes on my traditional folder blades. Makes them a bit more versatile imo

 

[knarfeng]

Heard of it. I don't practice it. I can really only remember one knife I used to do something along that line.

Some decades ago as a young engineer part of my job called for trimming sheets of a silicone rubber material which had been applied to a Mylar backing such that the two materials were exactly even on the edges. Cutting into the Mylar would ruin the piece. I found that the best way to ensure that the Mylar was not cut was to use a dull blade for that trimming operation. So I dulled out the spey blade on the little Buck Cadet I used to carry everyday and used that.

 

[Zootripper]

Well yes, we does. But most of us primitive blade sharpeners like to keep it simple, lol.

 

[Wowbagger]

Do you use two different edge geometries on 2-blade folder?​

No I remove one of the blades for a cleaner uncluttered grip on the handle . (usually remove the Spay blade on my Trappers . I don't need to spread peanut butter with it .)
ALL of my edges I prefer to have stupid acute ~ 12 degrees per side and 10 thou behind the edge. If I mess up the edge , I am using it wrong (I don't recall that ever happening ).

One specialized knife I have is way more acute ; haven't measured it but it is a zero ground Swiss Army Bantom (must be like 9 degrees per side Polished edge) . . . I was showing off cutting hard white plastic wire ties that were about 1/2 inch wide and the edge got a tiny bit wavy from it . BLEW THROUGH THE WIRE TIES NO PROBLEM THOUGH over and over.
!
I once was using a Temple Builder's Paring chisel (blue paper steel) . It was a chisel grind , obviously , and at twenty degrees "inslusive" . I was using it on some crazy hard and tough Purple Heart wood and the edge was showing a little bit of dinging / rolling .
I increased the total angle to 22 degrees and the thing cut for days parring VERY LARGE dovetail joints with no further edge problems .

So that works out to 11 degrees per side in a pocket knife .
hmmmmm

Can't think of anything else I would do that would need a more obtuse edge . Outside of metal working .

Here is the chisel


Here are the joints by the by.
Lots of cross grain / end grain cutting . That is what beats on the edge.