I did it by eye. I made it from the outer ring of a bearing (which is why my blade is 5 mm thick). I cut it in half, heated up one half, and forged it into a straight flat bar. Then I cut out the shape using an angle grinder (the teeth on the spine of the blade and fitted the shape for the handle) and sharpened the blade on a bench grinder. I made the holes in the blade using a drill press.
That’s awesome! I don’t understand the measurement scale pictured, though. How many bananas is that?
That’s a 20 cm (8-inch) ruler. The knife itself is 30 cm (12 inches). I put it there just for scale.
I was joking haha