This instructable is a tag-along to my first, "How to Build a Knife." I had some requests for this after I posted that first one, so here it is--a lot sooner than I thought, too.
So, you want to make a sheath? Maybe you have a nice old knife lying around that doesn't have one, or has a crappy one. Maybe that knife is store-bought or maybe you made it yourself, maybe it's a hunting knife, a fishing knife, a fighting knife, or a kitchen knife; in any case, you can make a good sheath for it.
So, if you're intrigued, or if you have nothing better to do, read on.
Step 1: Designing the sheath
Step number one: same as last time. Get out a pad of paper and a pencil. First, the sheath has to accommodate your knife's blade. Trace out the entire knife, handle and all, on the paper--see picture one. After that's done, draw your sheath around the knife. ALWAYS allow adequate space around the blade for expansion when the knife is in the sheath and connection of the sheath's sides. Here I'm going to make a layered leather type of sheath, a good kind for beginners as leather is more forgiving than other types of material like wood or metal. My project has three layers--the back of the sheath, the front panel, and a spacer between them. I gave about a quarter inch of space (maybe a little more in places) to connect them all. Of course, this much space might not be needed if you're doing another kind of sheath, such as a buckskin or front-sewn sheath.
As you can see from the second picture, the structural design of my sheath is pretty simple. It has a pouch and a belt loop, somewhat contoured to the first half of the grip. Don't think that something simple like this is the only option--there are thousands of other variations you can use, from the practical to the totally outlandish. I favor practical designs , but that's just me.