Quote from: Geoff in Philly on October 29, 2010, 03:36:51 PMAs the distance to from the tool support to the knife edge changes, isn't the distance equalized by arcing the knife handle and not lifting it?.
If you arc the knife handle instead of lifting, it might be possible to keep that distance from tool support to knife edge constant, but I've never had success doing it that way. Of course, the distance from the tip of the knife to the location chosen to clamp the jig is critical.
If, on the other hand, you lift the handle rather than arcing it, it's very easy to keep the bevel angle constant. As Jeff said, you get a bevel width that's consistent. I remember when I first saw the video of Jeff doing it that way, it was one of those "Ah ha" moments.
Think of it this way. If you arc the handle, you've got two degrees of freedom. In addition to controlling the arc angle, you must also control the lift angle. The reason for this is that the flange on the jig is now in contact with the tool support at only one point. If instead you lift the handle, the flange on the jig stays in full contact with the tool support, and you have only one degree of freedom to control, the lift angel.
You should also be aware of the fact that for your many folding knives, the blades will be too short to use the jig. You'll have to free-hand them. I don't recall if there's a video of Jeff demonstrating that technique.