Introduction: Marking Knife
I made a marking knife this year as a christmas present. It has a hidden tang blade of 1095 steel, with a handle made of walnut, wenge, and bloodwood. It can be used for anything from marking wood, opening packages, cutting out designs on paper, or even whittling.
Hope you all like it, make sure to vote if you do!
Step 1: Materials and Tools
I used the following resources to make this marking knife:
*1/8" thick 1095 steel
*Walnut, wenge, and bloodwood for the handle. You can use whatever hardwoods you like though
*5 minute epoxy
*Waterstones for sharpening the blade
*Hammer and a hard surface
Step 2: Forging and Shaping the Blade
I start by cutting off a little piece of 1095. It's a little over half an inch wide, and is 1" long. Next, using my forge, I carefully draw out a long tang, alternating between a cross pein hammer and a flat sledge. Once this is done, I grind a slight angle into the face of the edge, making an acute tip on one side of the blade. Then I use a belt sander to quickly put in a bevel. Leave the edge about the thickness of a dime right now, a very thin edge will cause problems in the heat treat, and we can sharpen it later. Next, I remove a little material around the base of the tang with a bench grinder, then clamp it in a vice and file the base of the tang square.
Step 3: Heat Treatment
1095 is what's called a hyper-eutectoid steel, basically meaning that it needs a very fast quench to harden. In my experience, I've found hot brine to work the best as a quenchant, but feel free to experiment and find a quenchant that works for you.
Anyways, I start by filling a cup with hit water and salt, this will be my quenchant. This blade is small enough that it is likely that the forge will quickly overheat the metal, so I bring it up to heat by using my burner outside of the forge. Once the metal is an even light red heat and is no longer magnetic, quickly dip it into your quenchant and hold it there until it cools. To test if your blade properly hardened, run it lightly across a file. If the file digs in and removes material, you will have to redo the quench. If your blade skates across the surface of the file, it is likely to be fully hardened and ready for the temper.
Right now the blade is as hard as glass and very brittle. It needs to be softened somewhat througj a process called tempering. This particular blade needs a very sharp edge and won't be put under very much stress, so I temper it at 300° F for an hour, which will leave the blade very hard. At this point I can now grind in the edge onto my blade, just make sure to keep the blade cool while you are doing this.
Step 4: Glueing Up the Handle
For my handle, I get two pieces of walnut that were cutoffs from one of my tables, and some scrap wenge and bloodwood leftover from a cutting board. I start by glueing the wenge and bloodwood together in a checkerboard pattern with wood glue. Leave them to dry for around an hour. The faces likely won't end up perfectly even, so I sand them flat on a disc sander. Then I take my two pieces of walnut and glue them to either side of the bloodwood/wenge block.
Step 5: Shaping the Handle
I draw a square at the bottom of approximately how large I want the final piece to be. Then, using a belt sander, I sand down to the lines. After this is done, I add a slight taper going down from the back to the end, then round of the corners to give it a nice oval shape. Once this is done, I sand it smooth with 320 grit sandpaper.
Step 6: Mounting the Blade in the Handle
This part can be a little tricky. First, find a drill bit that is very slightly larger than the tang of your blade. Using two clamps, I prop the handle up vertically and drill straight down into it. At this point, put the blade in the handle and check to make sure it fits right. You may have to widen the hole slightly. Now go ahead and mix up some 5 minute epoxy. Start by packing it into the hole you just drilled, then lightly coat the tang with the glue. Push the blade down into the hole as far as it will go. If extra glue comes out, just wipe off the excess. Set this aside to fully harden. Once it is dry, you can coat the handle with mineral oil to protect it and bring out the grain and color more.
Step 7: Honing the Blade
For sharpening, I used a king 1000 - 6000 combination water stone. Start by soaking the stone in clean warm water for about 30 minutes to an hour.
Next, take it out and place it 1000 grit side up. Drip water on the top so that a thin film of water coats the entire stone. Now proceed to rub the blade back and forth across the stone at a constant angle. Make sure to sharpen both sides of the bevel equally. It is very difficult to tell when it is time to step up a grit, but you will eventually want to flip the stone and start using the 6000 grit side. For this stone I start by rubbing a nagura stone across its surface to flatten the stone and work up a slurry. Then, only in a single direction (not back and forth) push the blade across the face of the stone. Black metal dust will start to appear where you are honing the blade, when it builds up use your nagura stone to clean the surface of the stone. Now just simply keep repeating this process until you have achieved your desired sharpness.
Step 8: Finished
Now that it's done, I wrapped it up and it's ready to be given as a gift! I hope you all enjoyed this instructable, don't forget to vote! Happy Holidays to everyone :)
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