Weeeeelll, it's not quite rue that I have done it to one of my khuk's, but as has been said, "I've wanted to."
However I did do the two kardas I made for my 18" AK.

On the thin bladed one I was about half sick that day and tired as well, I know better than to work when I'm like this, but went ahead and did it anyway. It's alright, but not nearly as nice as the file work I did on the karda I made from 1/2 of a pruneing shear.

Really I've been waiting on a certain special khuk to do file work on.
The Foxy's Follie just might be the one!!!!
Chainsaw files are excellent for file work as they are straight instead of tapered, makes it much easier to control!!!!
But I like to do a large part of the work with my Ryobi hand grinder with carbide bits. They make a nice cut if you have the work clamped down solid and can use both hands to control the motor. any slips and you've done screwed up, especially if the bit goes Willy Nilly across the blade!!!!
But it's best if you clamp the work down solid even with hand tools because two hands in this case is a thousand times better than one!!!!
Dan gives some good tips!!!! Pay attention to what he's saying.
Oh yeah.
I like to use a magic marker to mark the work area and after it's good and dry I mark the centerline of the work and the depth or distance I'm going down the blade with.
I also mark the depth or distance I'm going to cut into the spine as well.
I mark off each side from the centerline whatever depth I think will look good.
I also like to taper mine so that the area near the handle is deeper both down from the spine and into the spine and go shallower both ways the further down the blade I go.
It takes some practice to figure out what you want and how to do it, I think it's a good idea to work on a piece of hardwood the approximate thickness of the blade I'm gonna do.
A practice pice lets you know in advance what your filework is gonna look like and about how difficult it will be.
Keep it simple at first and then work up to the more complicated designs.
Good Luck!!!!
