Introduction: Make a Two Bladed Pocket Knife
Make A Two Bladed Folding Pocket Knife Made From PVC & Hacksaw Blade.
Step 1: Parts and Tools Needed
To make a Two Bladed Folding Pocket Knife you will need 1/2 " pop rivet, 2 washers, and "thin wall" Class 200 PVC . Time to make about 1/2 hour. Tools needed are hack saw, pop rivet gun, stove, sand paper, grinder (you can use a sharping stone rather than a grinder but it takes longer).
Step 2: Make Blade Blanks
Flex hacksaw blade back and forth to brake off the ends for blades. I leave one as a saw but you could make it a knife, screwdriver or other tools. You can make 3, 4 or more blades if you want.
Step 3: PVC
I used class 200 PVC 1" split into 1/3 but you can also use a whole section of PVC (heat and smash; then cut length ways to make your handle)
Step 4: Grind Blades
Grind the teeth off of one of the blades, sharpen and shape.
Step 5: Keep Them Cool
When grinding never let your blades get so hot you can not touch. If they get too hot them they will not hold an edge. Cool often by dunking in a can of water.
Step 6: Soften the PVC
Heat PVC over your stove. Do not scorch. Keep it moving always. You should be able to just barly handle it by hand. When soft and flexable quickly insert your two blades and press it into shape till it cools.
Step 7: Shape PVC
Use a hot pad to press the soft and hot PVC to make your handle. Make sure you first insert the blades so that the handle will not be too tight.
Step 8: Blades and Handle.
Blades and handle.
Step 9: Smooth Handle
Sand and round the edges of the PVC. also sand out a finger slot to grab the blades when folded.
Step 10: Assemble Blades Into Handle
Drill hole same diameter as the rivet. Place the hole 5/8 " from the end of your handle so that when blades are open the back of blades are supported by the handle. See the two washers on the rivet. The PVC is not stiff enough without the washers.
Step 11: Before Riveting...
Wedge the mid section of your hacksaw blade between the two blades of your knife before pop riveting. This when removed provides spacing so you can open the blades after riveting other wise the blades get squeezed together by the rivet.
Step 12: Note:
End of rivet protruding. Also note how back the blades ,when the knife is open, rest on the handle
Step 13: Sand Rivet
Sand of file the pop rivet so it is smooth.
Step 14: Folded
Two Bladed Folding Pocket Knife folded.
Step 15: Make Stuff and Have Fun
Two Bladed Folding Pocket Knife finished. Sharpen knife. Try useing other materials for handles. Try more blades. Make stuff and have fun. See my other instructables including: Folding Pocket Saw Make From Jig Saw Blade: https://www.instructables.com/id/ENL46QP3WBEP2877LF/ and look at my http://www.webfun.org site.
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78 Comments
5 years ago
Wow! That's such a simple and cheap pocketknife!
6 years ago on Introduction
9 years ago on Introduction
pretty cool r u going to put ur name into the side contact me back
9 years ago on Introduction
Thats is awesome. sadly i dont have all the tools to make it :(
9 years ago on Introduction
Seems to me like the pvc would wear and let the blades wobble around and fall shut. I wonder if you could use one of those spring washers between the blades. that seems like it would keep them the right tightness even when the thing wears a bit.
9 years ago on Introduction
Clever!
9 years ago on Step 15
Thank you, I appreciate these sorts of projects and the nice layout that is step by step.
9 years ago on Step 7
awsome
dude
9 years ago on Introduction
If you arrange the saw blade so that it cuts on the pull stroke, rather than the push stroke like normal, it'll help prevent the blade from breaking.
Reply 9 years ago on Introduction
hey yeah....like a japanese hand saw!
9 years ago on Introduction
seems pretty awesome, although i have tried making knives from hacksaw blades and they always snap. i would try this, but use old reciprocating saw blades.
10 years ago on Step 15
looks good. the blades will be a little brittle, but should work. well done
10 years ago on Introduction
extraordinarily good!
10 years ago on Introduction
G567 MY NEW CODE NAME
10 years ago on Step 15
looks pretty cool and easy. Might have to try it when i get some time!
11 years ago on Introduction
have you tryed meccano for the handle?
11 years ago on Introduction
Nice Instructions. very clear and precise. 2 bladed folding knife is very handy. i was thnking of making one with 2 saw blades. thanks for sharing
Spring Assisted Knives
11 years ago on Introduction
I like it. Nice work. I make mini neck knives out of hacksaw blades as well.
I use a simpler technique they are part of a necklace kit I make.
But I really like this. These are up to $5 and you just made one for free basically.
Strong work keep it up. Peace
11 years ago on Introduction
So how do you make the knife lock.
11 years ago on Introduction
i made a few of these knives today i made one like the one in the picture but with a sharp point rather than a rounded one i also made a single bladed version (also sharp pointed) and then i made a folding fillet knife but with the same materials! i not only made the point on the blade but i polished the blade with a belt sander and then fie sand paper and it looks really professional! thank you so much for the idea by the way!