Introduction: How to Make a Harpoon on the Cheap
Demonstrates how to make a harpoon, similar to the Hoffman Harpoon, intended as a sort of minimalist survival tool. It's 8 inches long, with a 2 and one half inch blade, the handle is wrapped in paracord.
I haven't made a sheath for it yet, but will post it when I do.
Step 1: Gather Materials and Tools
For this project you will need the following:
- 8"x2" peice of metal.
(I used an old machete from walmart)
- saw to cut metal aka hacksaw.
- a couple metal files; flat, rounded, and 1/4" round file.
- sandpaper, grits 60 and up.
- paracord, or whatever 1/8" cordage you've got lying around.
- vise (optional but helps a lot)
- drill (optional if you make a lanyard hole)
- honing stone (optional, but not if you want a sharp blade)
Step 2: Find a Helper
If you don't have a vise you can always get a puppy to help out, just make sure not to stick 'em with your new harpoon.
Step 3: Make a Template
Graph paper helps here, sketch out what you want the tool to look like, it's helpful to include a line indicating where the blade bevel will stop (I forgot to do that). Fot this one I made the blade at a 30degree angle to the handle, if I made another one I'd reduce that to 25 or 20 degrees. It is 8 inches over all, the blade is 2 1/2 inches long, the main part of the handle is about 1/2 an inch thick. The curve at the base of the blade serves a dual purpose of a hand grip and making a barb, ensuring whatever you stick won't come lose. Line up the flat edge of your blank and the template and glue the template onto the metal. Any glue will work but I used superglue so I wouldn't have to wait long for it to dry.
Step 4: Cut Out the Blank
Time to use the vise and hacksaw. There's a special purpose blade for cutting metal that's round, letting you change directions much easier than with the normal flat blade. In retrospect this would have made cutting a lot simpler.
To accomidate the blade I used I had to notch above the handle to create enough space to cut out the blank and then had to recut to get the thickness of the handle where I wanted it. Also when cutting the curves in the handle make sure to cut kerfs, being careful to stop just short of the edge, otherwise it requires a lot of filing to get rid of the gouge and may alter the shape you intended. Oh, and if you use a flat blade like I did you'll probablly have to rotate the blade occasionally so the frame of the saw isn't in the way.
An optional step is to drill a lanyard hole in the base.
Step 5: File and Sand
First file everything down to the lines on your template, making sure that all is smooth. Use care when filing the blade section to make it as flat as you can. About where your thumb will rest if your index finger is in the curve below the blade I make a few notches with a round file to improve grip when cutting. To start them make a very shallow cut with the hacksaw.
For the blade edge I made only one bevel, leaving the other side flat. Take into consideration which side you want the bevel on, especally if you're left-handed (make it on the opposite side I did).
Next sand off the paper, sand around the edges, sand the edges smooth, sand the file marks off the blade. Start with 60 grit paper, and work up to at least 220. The more care and higher grits you go to the better it will look in the end. You don't really need to worry about sanding off the black coating if you're using a walmart-machete; it'll help prevent rust by leaving as much on as possible but if you take care of it that won't be necessairy.
Step 6: Hone the Blade to a Knife-edge and Wrap Handle
To hone the blade use a shapening, or honing, stone. The blade should be fairly sharp after sanding but this will give it an even better edge. Follow the directions that came with your particular stone, mine came from Ace Hardware for about $10 and I have to use a light oil with it, some recommend water. Just make sure to hold it at the same angle you've filed and sanded, which should be 15 to 20 degrees. Because it's chisel-edged, insted of v-ground like a knife, sharpen it on the stone by placing the bevel down and drawing the blade toward you. Don't run it back and forth.
The only thing left to do now is to attach the cord on the handle. This is to make it easier and more comfortable to use as a cutting tool, and also to store the cord you'll need to attach it to a staff, making a true harpoon out of it. Ideally the cord is to be paracord, but if you can't run down to your local army surplus store, just about any 1/8" cordage will do.
To wrap the cord, first hold the ends together and find the middle. Place the harpoon on top of the middle of your cord. make an overhand knot, the same as the first step of tying your shoes. The way I do it the cord on the left will always go under, the cord on the right will always go over. If in doubt study the tying diagram. You can finish the wrap by tying a square knot on one side of the handle (two overhand knots on top of each other) or if there's enough cord, just go through the lanyard hole and make a knot on the other side of it. Tie the two ends together to make a loop.
Step 7: Use Your New Tool
I went out to a stream where there's usually clear shallow water so to demonstrate how to use the harpoon to catch a fish, but the rain from last night and this morning has made it as muddy as the mississippi. So not wasting an opportunity I cut a peice of a tire innertube to use (https://www.instructables.com/id/Comfortable-shoes%3a-How-to-make-shoe-insoles-from-i/) because my helper ate the insoles of my boots.