Introduction: Make a Two Bladed Pocket Knife

Picture of Make a Two Bladed Pocket Knife

Make A Two Bladed Folding Pocket Knife Made From PVC & Hacksaw Blade.

Step 1: Parts and Tools Needed

Picture of 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

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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

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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

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Grind the teeth off of one of the blades, sharpen and shape.

Step 5: Keep Them Cool

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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

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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

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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.

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Blades and handle.

Step 9: Smooth Handle

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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

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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...

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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:

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End of rivet protruding. Also note how back the blades ,when the knife is open, rest on the handle

Step 13: Sand Rivet

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Sand of file the pop rivet so it is smooth.

Step 14: Folded

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Two Bladed Folding Pocket Knife folded.

Step 15: Make Stuff and Have Fun

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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: and look at my site.


Yonatan24 (author)2016-01-10

Wow! That's such a simple and cheap pocketknife!

kalebpolley (author)2014-11-03

Schmidty16 (author)2012-06-02

pretty cool r u going to put ur name into the side contact me back

bioprodigy04 (author)2012-03-28

Thats is awesome. sadly i dont have all the tools to make it :(

heathbar64 (author)2012-02-13

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.

applesaucemodifier (author)2012-02-12


Grimmy Grim (author)2012-01-01

Thank you, I appreciate these sorts of projects and the nice layout that is step by step.

ghost999 (author)2011-12-05


The Mariner (author)2011-08-21

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.

acoleman3 (author)The Mariner2011-11-23

hey a japanese hand saw!

ilpug (author)2011-08-21

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.

gary.918 (author)2011-03-28

looks good. the blades will be a little brittle, but should work. well done

teodoropires (author)2011-02-22

extraordinarily good!

(YOUR N (author)2010-11-23


TALLJ29 (author)2010-08-11

looks pretty cool and easy. Might have to try it when i get some time!

skimmo (author)2010-06-11

have you tryed meccano for the handle?

ajjardin (author)2010-04-30

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

cloudrunnersurvival (author)2009-10-23

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

Don,t try this at home (author)2009-09-23

So how do you make the knife lock.

weaponscollector94 (author)2009-08-29

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!

tahirhh (author)2009-03-13

if you have access to a laser cutter, you can make the sided bits on 2D Design

ajk97 (author)2009-03-13

Does the knife stay open or is it loose and fall back into the handle? Thanks and great Instructable.

Murdok (author)2007-08-02

How do you pop-rivet? I need a substitute, any ideas?

Matin (author)Murdok2007-08-03

Pop-rivets are small metal rivets that require a "Pop-rivet tool" to make it work. You can get both at most hardware stores. You can also use regular copper rivets which use a hammer to mash the protruding end.

imthatguy1125 (author)Matin2009-01-29

how much does a pop rivet gun cost

bob_shaftenkluger (author)Murdok2008-09-12

Use a bolt?

berky93 (author)2007-01-11

I'm in the process of making a metal version of one of these, but I realized that the knives will dull when they contact the metal over and over. What can I use to cusion them? I was thining of this rubber coating stuff, but I don't know what it is called and where to get it. help please?!

l96470fps (author)berky932008-12-07

y dont u use inner tube??

Vendigroth (author)berky932007-01-30

er....try a little bit of papre, just folded and pushed into the handle, if that doesn't work try and get some thin leather or a piece of the sealing rubber off waterproof torches. or even an elastic band poked into the bit where the knife'd touch the metal

reeding (author)Vendigroth2007-02-02

take a swiss and cut off all but 2 blades

chemy999 (author)reeding2007-06-11

or just take a swiss

Vendigroth (author)berky932007-01-30

i know i should leave you alone, but i just realised as i got home from college that if you use copper as the metal, the steel'd not be damaged cos the copper's softer

xenongamer (author)2008-11-30

good. I might try this, seeing as my other knife got... broken... while i was trying to modify it. yeah, who knew that tungsten could destroy half the house.

im so thirsty (author)2008-11-28

i like the style i made one sorta like it expet was an otf swicth

im so thirsty (author)2008-11-28

and i mean the par were u bind the pvc

im so thirsty (author)2008-11-28

its realy cool but how do u get it to fold

pumpkinman (author)2008-11-10

extremly nice instructable, i used boilin water to bend my pvc pipe and that did not work so well. do you have any idea of what to make of the rest of the hack saw blade?

Lance Mt. (author)2008-11-07

Boiled water. It does the job rather than a naked flame with toxic fumes.. Other than that, It's super sweeeet (making 1 now.)

nfsaggese (author)2008-10-03

Do you know how to make it a locking blade?

led_scorched (author)2008-09-13

very cool.. if i had more time, i would totally try this!

DIYerr (author)2008-08-21

This is an exellent instructable. I am using the pvc material and method described here as a substitute to a kydex sheath for a very small neck knife I just started making.

bowmaster (author)2008-08-20

I am going to make a balisong

AnarchistAsian (author)2008-07-06

nice instructable, but when you melt the plastic, be careful, the fumes coming off of it could kill you...

stone3408 (author)2007-01-04

I diagree this could be very useful if produced without the knife (that could be a problem). Think screwdriver shape, lock pick, wire bending notch, or awl along wih the saw. I would even consider using jig saw blades, less grinding I will have to destroy some saw blades over this one. I wonder if you could wrap that all up in one sawsall blade sheath it and make it wallet worth.

stone3408 (author)stone34082007-01-04

like this...

sk8erdude (author)stone34082008-05-23


sk8erdude (author)2008-05-23

Awesome!!! after seeing your other knife instructable i came up with the exact same idea but i didn't know what to use for a casinggreat instructable i rate 5 star! thx 4 posting -sk8erdude

omzig18 (author)2008-01-22

congratulations you have been added to stumble upon!

X_D_3_M_1 (author)2007-10-24

hey yo this was on primitive !

lewigi (author)X_D_3_M_12007-11-16


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