I'm saving money for my next batch of hacksaw blades, however.
With steel of that size, maybe a metal cutting bandsaw would be cheaper!
How you keep the bevel flat instead of convex, etc.
Typically I file "normally" for the majority of the work. In other words, I push the file from edge to spine, more or less. That leaves you with some degree of convexity in the edge. Because this knife was kind of angular, I used draw filing (to really thin the bevel down and flatten it. To draw file, I clamp the knife so it is pointing right at me, then I lay the file across the bevel, 90° to the edge, and both pull and push the file along the long axis of the blade. It's probably hell on my file, but it's seen worse! This is actually the first knife I did any draw filing on and it turned out just slightly convex instead of perfectly flat, but it's pretty darn close. I was inspired by my German buddy, who uses a file and everything is completely flat and perfect. An added bonus of draw filing is not only that you can thin out the convexity of the normal filing, but also it gets all your deep scratches going in one direction, so I found my finishing to be a LOT better once I started doing things this way. Otherwise I'd have these deep gouges that ran perpindicular to the blade that all the sanding in the world wouldn't get out.
Did YOU make this knife, or your German friend? If you did this, are you saying you used no sandpaper in it's completion/finish?
Sorry for the confusion. I made this knife. It used new techniques, for me, like draw filing, inspired by thie German guy. The grinding was all done with files, then of course, I used sandpaper for finishing. It'd be pretty tough to get a finish like that with a file! Actually, I file, draw file, then I use a coarse, medium then fine Lansky stone with water, then wet sand with 220, 320 and I think I stopped at 400 for this one. Then clay coated, sanded wiith 220, 320 and 400 again, then etched. Then rubbed with steel wool and WD-40.
I'd love to, but haven't gotten around to it. Now that I have a digital camera I could do it. The Jones Brothers have a great tutorial, but different from how I do it. I can't seem to find a link, but hopefully someone will post it. Hopefully that'll be something I can do as a project soon.