I Built an Invisible Katana (it's indestructible)

Mike Shake
10 Apr 202422:02

Summary

TLDRIn this inventive video, the creator embarks on a unique project to construct an 'invisible' katana made from polycarbonate, a material known for its transparency and durability. Through a series of meticulous steps, including designing, cutting, grinding, and polishing the material, the creator successfully forges a sword that appears nearly transparent under certain conditions. Rigorous testing against a variety of targets demonstrates the katana's impressive strength and sharpness, despite an unexpected break during a brick test. The video concludes with the creator's excitement over the katana's capabilities and a teaser for a future project.

Takeaways

  • 🗡️ The project's goal is to create an invisible, unbreakable, and sharp katana sword using unconventional materials.
  • 💡 Initial considerations for the material involved glass, but polycarbonate was chosen for its superior impact resistance and lightweight properties.
  • 🚀 A test involving hitting a polycarbonate panel with a sledgehammer demonstrated its impressive durability.
  • 📏 The katana design began with outlining the shape on a large sheet of polycarbonate and cutting it to size.
  • 🔨 The creation process included multiple steps such as grinding, sanding, and polishing to achieve the desired transparency and sharpness.
  • 🔧 A bevel was added to the blade for sharpness, but it introduced distortions, leading to a redesign with a shorter bevel to minimize visibility.
  • 🔩 The handle was initially a concern for breaking the sword, but it was later reinforced with additional polycarbonate for extra strength.
  • 🥊 The katana was tested against various targets, demonstrating its cutting power on soft to hard materials without significant damage to the blade.
  • 🏆 Despite the impressive results, the katana's edge was still expected to chip and require resharpening after extensive use.
  • 💡 The experiment showcased the potential of polycarbonate as a material for creating unique and functional objects with the right techniques and treatments.

Q & A

  • What was the initial idea behind creating the invisible sword?

    -The initial idea was to create a sword that was not only invisible but also destructible, sharp, and functionally similar to a normal sword, specifically a katana.

  • Why was glass dismissed as a suitable material for the invisible sword?

    -Glass was dismissed because, despite its transparency and the ability to make it sharp with a diamond stone, it is prone to breaking too easily, making it unsuitable for constructing a durable katana.

  • What property of polycarbonate makes it an ideal material for the invisible sword?

    -Polycarbonate is ideal because it is transparent, impact-resistant, and approximately 10 times more resistant than steel by weight, making it suitable for creating a durable and invisible sword.

  • How was the shape of the katana transferred onto the polycarbonate panel?

    -The shape was transferred using tape to outline the consistent curve of the katana on the panel, which was then used as a reference for the actual cut.

  • What was the outcome of the test where the polycarbonate panel was hit with a sledgehammer?

    -The polycarbonate panel remained completely fine after being hit with the sledgehammer, with only a barely noticeable scratch, demonstrating its resilience and suitability for the sword project.

  • How did the creator ensure the katana maintained its lightness despite being twice the size of a normal katana?

    -The creator used polycarbonate, which is lighter than steel, ensuring that the larger size of the katana would not compromise its ability to be swung easily.

  • What was the process of sharpening the katana?

    -The process involved creating a bevel on the blade by grinding it symmetrically on both sides using a belt grinder, followed by smoothing out the angle between the spine and the bevel to prevent reflections and further polishing to increase transparency.

  • What issue arose from the variable thickness of the transparent material?

    -The variable thickness caused distortion of objects behind the katana when viewed through it, which reduced the desired invisible effect.

  • How was the handle of the katana initially intended to be made?

    -The initial plan was to use an acrylic block and carve a handle from it, but the creator opted for a simpler and more transparent approach by gluing extra polycarbonate pieces and shaping them into a handle.

  • What happened when the katana was tested on various targets, and how did the creator address the issue of the sword breaking?

    -The katana successfully cut through soft to hard targets, but it broke when extra material was glued to the handle for rigidity. The creator theorized that the rigidity made the sword more likely to break, so they decided to use the sword without the handle, which proved to be unbreakable even when hitting a brick.

Outlines

00:00

🗡️ Crafting an Invisible and Indestructible Katana

The video begins with the creator's fascination for an invisible sword, leading to the ambitious project of building one. The material selection process is discussed, with polycarbonate being chosen over glass due to its superior impact resistance and durability. The creator tests the polycarbonate's strength with a sledgehammer and proceeds to shape the katana using a panel of polycarbonate. The video highlights the challenges and the creative solutions employed, such as using tape to outline the sword's curve and employing a jigsaw and band saw for cutting. Despite the katana's oversized appearance, its light weight ensures maneuverability, and the creator expresses excitement about the final product's potential invisibility and strength.

05:11

🔪 Sharpening and Perfecting the Invisible Blade

In this segment, the creator focuses on sharpening the katana and enhancing its invisibility. The process of creating a bevel on the blade using a belt grinder is detailed, along with the development of a custom tool to maintain a consistent angle during grinding. The creator's inexperience with grinding does not deter the progress, and after a messy yet successful process, the katana begins to take shape. Further steps to refine the blade's transparency involve sanding with various grits and polishing with a headlight polisher. The creator also addresses the issue of light distortion caused by variable thickness in the blade and introduces a new design approach to maintain consistency in thickness for better invisibility, resulting in an improved, more transparent katana.

10:13

🥋 Testing the Katana's Cutting Power and Durability

The creator moves on to testing the katana's functionality by cutting various targets ranging from soft to hard, such as pineapple, watermelon, pumpkin, a wooden plank, a ballistic dummy, and finally, a brick. The katana performs remarkably well, slicing through the soft targets effortlessly and even managing to break through the brick, much to the creator's surprise. However, a significant issue arises when the katana snaps at the handle during testing, revealing the drawback of adding rigidity to the handle. The creator hypothesizes that the handle's extra material made it too rigid, negating the polycarbonate's natural ability to bend and absorb impacts. After reconfiguring the handle, the katana continues to pass tests with flying colors, demonstrating its sharpness and durability even after cutting through bone in the ballistic dummy.

15:13

🏹 The Ultimate Test: Cutting Through a Brick

The video concludes with the ultimate test of the katana's strength and durability: cutting through a brick. Despite initial doubts, the katana exceeds expectations by not only cutting through the brick but also by doing so without significant damage to the blade. The creator's astonishment is evident as the katana proves its worth, even after facing the most challenging test. The video ends on a high note, with the creator's satisfaction in the katana's performance and an invitation for viewers to subscribe for upcoming projects and support the creator on Patreon for behind-the-scenes content and early access to videos.

Mindmap

Keywords

💡Invisible Sword

The concept of an 'Invisible Sword' refers to a weapon that is not visible to the naked eye, often due to its transparent nature. In the video, the creator aims to build a sword that is not just invisible but also durable and sharp, using materials like glass and polycarbonate to achieve the desired effect. This central theme drives the entire project, as the creator experiments with different methods and materials to make the sword appear invisible while maintaining its functionality.

💡Polycarbonate

Polycarbonate is a type of plastic material known for its high impact resistance and transparency. It is used in the video as the primary material for constructing the invisible sword due to its ability to withstand significant force without breaking and its transparency, which is essential for achieving the 'invisible' effect. The material's properties make it an ideal candidate for creating a durable and lightweight sword that maintains the appearance of being invisible.

💡Katana

A katana is a traditional Japanese longsword characterized by its curved, single-edged blade and long handle. In the context of the video, the creator designs and builds an oversized katana using polycarbonate to achieve the goal of an invisible and indestructible sword. The katana serves as the blueprint for the invisible sword, with modifications made to its size and material to fit the project's requirements.

💡Sharpness

Sharpness refers to the ability of a blade to cut or pierce objects with ease, often due to the fineness of its edge. In the video, the creator is concerned with not only making the sword invisible but also ensuring it remains sharp enough to function as a cutting tool. This involves creating a bevel on the blade and then honing it to a sharp edge using various grinding and polishing techniques.

💡Durability

Durability refers to the ability of an object to withstand wear, damage, or decay over time without significant loss of function or aesthetic quality. In the video, the creator seeks to build a sword that is not only invisible but also highly durable, meaning it can withstand impacts and cutting forces without breaking or becoming damaged. This is crucial for the project, as the sword must be able to function effectively and maintain its appearance through various tests.

💡Material Testing

Material testing involves the process of evaluating a material's properties and performance under various conditions to determine its suitability for a specific application. In the video, the creator conducts several tests on polycarbonate and the finished katana to assess their strength, impact resistance, and transparency. These tests are essential to ensure that the materials used can meet the project's goals of creating an invisible and durable sword.

💡Belt Grinder

A belt grinder is a power tool used for grinding, shaping, and finishing metal or other hard materials. In the video, the belt grinder is used to shape the bevel on the katana's blade, which is a crucial step in achieving the desired sharpness. The belt grinder's abrasive belt, which can be adjusted for different levels of coarseness, allows for precise shaping and smoothing of the blade's edge.

💡Sanding and Polishing

Sanding and polishing are finishing processes used to smooth surfaces and reduce imperfections such as scratches or rough edges. In the context of the video, these processes are critical for achieving the invisible effect of the katana. By using sanders with progressively finer grits and polishing compounds, the creator is able to remove scratches from the belt grinder and create a smooth, transparent surface on the blade.

💡Distortion

Distortion refers to the alteration or misrepresentation of the shape or appearance of an object, often caused by the refraction of light through a medium with varying thickness. In the video, the creator notes that the katana's blade can cause distortion due to its variable thickness and bevel. This effect is undesirable as it compromises the sword's 'invisible' appearance, making objects behind the blade appear warped.

💡Handle

A handle is an attachment to a tool or weapon that allows for a user to grip and control it. In the video, the handle of the katana is a critical component, as it not only affects the usability of the sword but also its structural integrity. The creator initially struggles with the handle's design, finding that adding extra material made it too rigid and caused the sword to break. Through trial and error, the creator discovers that a minimalist, transparent handle best maintains the katana's flexibility and invisibility.

💡Testing

Testing in this context refers to the process of evaluating the performance and effectiveness of the katana through a series of challenges. The creator conducts various tests on the katana, ranging from cutting soft fruits to striking hard materials like bricks, to assess its sharpness, cutting ability, and durability. These tests are essential in determining whether the sword meets the project's goals and serves as proof of its capabilities.

Highlights

The concept of creating an invisible, destructible, and sharp sword was introduced, inspired by a picture of an invisible sword.

The first material considered for the sword was glass, due to its transparency and the ability to make it sharp with a diamond stone.

Polycarbonate was identified as a superior material due to its transparency, impact resistance, and usage in items like riot shields and armored vehicles.

A test was conducted to assess the durability of polycarbonate by hitting it with a sledgehammer, which left no visible damage.

A 2m by 0.5 and 12mm polycarbonate panel was chosen to be the body of the invisible and indestructible sword.

The process of shaping the katana involved using tape to outline the desired curve and then cutting the shape out with a jigsaw and a bandsaw.

The creator realized the katana was twice as large as a normal one, but due to the lightweight nature of polycarbonate, it wasn't expected to be a problem to swing.

The process of sharpening the sword involved creating a bevel on the blade and using a belt grinder to ensure a consistent angle on both sides.

To achieve invisibility, the creator sanded the sword with eight different grits, starting from coarse to polishing ones.

Headlight polish was applied to remove micro-scratches and further enhance the transparency of the katana.

A design issue was discovered with the variable thickness of the blade causing distortion; a solution was proposed to maintain consistent thickness as much as possible.

The handle was created by gluing extra polycarbonate pieces and then shaping and polishing it, resulting in a unique ice-like effect.

The katana was tested against various targets, including soft fruits and a ballistic dummy, demonstrating its cutting power and durability.

The katana was found to be capable of slicing through a wooden plank and even a brick, showcasing its impressive strength.

Despite the initial break during testing, the katana's blade remained sharp and undamaged, highlighting its resilience.

The final katana was not only invisible and sharp but also demonstrated a high level of durability and cutting power, making it a successful experiment.

Transcripts

00:00

have you ever seen an invisible

00:02

sword well I think I have a few days ago

00:06

I saw this picture right here that is an

00:09

invisible sword and now I want one just

00:12

like that a sword that's not all

00:14

invisible but also destructible and

00:17

sharp a sword that's basically like a

00:19

normal one but that you can't see I'm

00:22

going to build one not sure how yet I'm

00:25

going to have to figure it out and then

00:26

I'm going to test its sharpness and

00:28

durability against increasingly harder

00:30

targets the first step was choosing the

00:32

right material and the first one that

00:34

popped into my head well it was glass

00:37

glass is transparent when it's cleaner

00:40

than that and you can make it pretty

00:42

sharp by using a diamond Stone like it

00:44

did here but even though there are some

00:46

kinds of glass that can be more

00:48

resistant than usual and even

00:49

indestructible according to the

00:51

companies that sell them the problem

00:53

with glass is that glass is

00:55

glass and glass breaks at least way too

00:59

easily to make a katana out of it but

01:00

there is another material that not only

01:02

is transparent but it's 10 times more

01:05

impact resistant than steel by weight

01:08

I'm talking about polycarbonate it is

01:10

generally used for riot shields armored

01:12

vehicles safety glasses and other

01:15

indestructible items and because of all

01:17

that it sounds like the perfect material

01:19

for the job but I kind of still want to

01:21

see for myself how hard it actually is

01:24

to find that out I'm carrying out a

01:25

small sample from the panel I'm planning

01:27

to use for the katana and the idea is to

01:29

hit hit the polycarbonate as hard as I

01:31

can with this unnecessarily big

01:34

Sledgehammer 3 2

01:39

[Applause]

01:40

1 and well I'm not exactly sure what

01:43

just happened I only know that even

01:45

though B saw horses broke because of the

01:47

impact the polycarbonate panel is

01:50

completely fine this thing has one

01:52

scratch but you can't even feel it it's

01:55

not even bended or anything it's like

01:58

insane and since polycarb is clearly

02:01

resilient meaning it can bend like a lot

02:04

without breaking it's definitely my best

02:07

option so to make the katana I got a big

02:09

panel of polycarbonate 2 m by 0.5 and 12

02:13

mm or 0.47 in Stick which is also the

02:16

maximum thickness I could find for this

02:18

material and this is going to be the

02:20

invisible and indestructible body of the

02:22

sword now to cut the right shape out of

02:24

the panel I'm going to use tape what I

02:27

mean is that tape should make it easier

02:29

to draw the consistent curve of the

02:31

katana on the panel and then I can use

02:33

that as a reference for the actual cut

02:35

and after outlining the tip the edge and

02:38

completing the handle I can start to see

02:40

the final shape of the sword there is

02:42

just one thing to point out I

02:45

involuntarily made this thing big like

02:48

way too big it's basically twice as

02:50

large as a normal Katana and I'm not

02:51

sure if I should be excited because the

02:53

katana is massive and it's going to be

02:55

powerful or worried because the katana

02:57

is massive and I might not be able to

02:59

even lifted but after making a few

03:01

scientific tests I realized that because

03:04

polycarbonate is so much lighter than

03:06

steel it shouldn't be a problem to swing

03:08

the sword even if it's that big and so

03:10

I'm not worried anymore I'm just really

03:13

excited instead then I use the jigsaw to

03:15

C out a smaller perimeter around the

03:17

sword so that it's going to be easier to

03:19

work with it in the next step and after

03:21

doing that it became even more

03:23

noticeable how big this thing is going

03:25

to be now the next step is to crop the

03:27

actual shape of the sword out of the

03:29

panel and and to do that I'm going to

03:30

use a b saw then after cutting the shape

03:33

I can remove the protective film and I'm

03:35

going to be able to see if the sword

03:36

actually looks invisible the problem is

03:38

that Ben sace don't look too friendly

03:41

and most importantly I don't exactly

03:43

know how to use one so I got pretty

03:47

nervous

03:49

uh I already cut one part I forgot to

03:53

film I cut it really bad you see the

03:57

good thing is that I need to follow the

03:59

in interor line this part inside here so

04:02

my terrible cut wasn't actually a big

04:04

deal for now then I cut the extra

04:07

material out of the other side of the

04:09

katana and like that I was getting

04:12

closer now comes the hardest part I need

04:14

to follow these lines here and be

04:17

precise now this is definitely scarier

04:20

and I don't mind my fingers being close

04:21

to a deadly saw but making a mistake

04:24

here means removing material out of the

04:26

final Katana and potentially having to

04:28

start from zero luckily though I was

04:30

getting the hang of it and after

04:32

removing the extra material from the

04:33

handle I'm fixing the final details on

04:36

the Belt grinder as you can clearly see

04:38

here anyways like that the first step to

04:41

make the sword is complete I'm also

04:44

happy to see the weight of the katana is

04:46

not a problem at all it's not too light

04:48

not too heavy and the katana is not

04:51

bending on itself which means I'm

04:53

definitely on the right track and now a

04:55

few seconds of Silence while I remove

04:57

the plastic wrap

05:10

now the sword looks pretty invisible

05:12

already but inside the shop the effect

05:14

is actually weaker because of the lights

05:17

like in real life like like this it's

05:20

completely transparent for me

05:23

wait what if I do

05:28

this and that was already more like it

05:32

or less like it but outside it gets even

05:37

better bear in mind you can still see

05:39

the edges because there is no blade and

05:41

the spine is not polished so it might be

05:44

that the katana also looks darker

05:46

because the edges block the light but

05:47

when the edges are perfectly

05:49

perpendicular to the camera this thing

05:51

looks fake the effect is even stronger

05:55

when there is light behind it and I'm

05:57

very excited to see what this Katana is

05:59

going to look look like when it's

06:00

done I'm going to get this thing sharp

06:03

then I'm going to make the handle and

06:04

then I'm going to test it

06:06

against a lot of

06:09

stuff the first step to get the sword

06:11

sharp is to create a bevel on the blade

06:13

so after marking the center of the blade

06:15

using a caliper I'm retracing the line

06:17

with a pencil this line is going to be

06:19

my reference for the edge while grinding

06:21

also to make sure I'm going to grind the

06:23

blade symmetrically on both sides

06:25

basically like this I made this tool

06:28

this mechanism allows me to set a

06:30

certain angle so that when I grind the

06:32

sword with a belt grinder the angle

06:34

should stay consistent as well as the

06:36

bevel on both sides and this is all

06:38

Theory by the way I've never grinded

06:41

almost anything in my life and this

06:43

could honestly mess up the entire sword

06:45

but of course there is only one way to

06:47

find

06:48

out and well even though I felt like I

06:51

was doing everything wrong at the

06:52

beginning after basically 1 hour of

06:54

grinding the first side of the bevel was

06:57

completed and besides making an absolute

06:59

mess everywhere including on my face I

07:02

think it came out bad but much better

07:05

than expected and so after repeating the

07:08

process on the other side of the blade

07:09

the rush shape of the sword is done the

07:12

katana is not sharp yet but it has an

07:14

edge now and so the next step is going

07:16

to be making it invisible through do

07:18

that I'm going to smooth out the angle

07:20

between the spine and the bevel mainly

07:22

to prevent Reflections like the ones you

07:24

see here and while doing so I'm going to

07:25

also remove the scratches I got from the

07:27

belt grinder and hopefully turn turned

07:29

the katana even more transparent than

07:32

how it was before so I got a sander with

07:34

eight different bads from a course crit

07:37

to basically a polishing one and by

07:39

sending the katana with each one of the

07:41

pads in theory I'm going to be able to

07:44

make it transparent and well after a

07:46

little more than 2 hours I was basically

07:49

done with a first pad anyways I made

07:52

sure to remove every single scratch from

07:54

the belt grinder and even after just the

07:56

corser pad the katana already looks

07:59

pretty cool now I'm going to repeat the

08:03

process seven times and so I did each

08:06

time with a finer grd and each time

08:09

making sure to remove all the scratches

08:11

that were there before and after about 1

08:13

hour and something I was using the final

08:16

pad after that I'm sending everything

08:18

with a 2500 great sandpaper by hand and

08:22

with this I'm finally starting to see

08:23

the first good results now it's looking

08:26

good when it's wet it looks great

08:36

right now there are still a lot of micro

08:38

scratches on the surface of the blade

08:40

and that's why the katana doesn't really

08:42

look transparent yet so now I'm going to

08:44

try to remove them using this headlight

08:47

polisher and after applying it on the

08:48

sword with a sponged pad the katana was

08:51

polished and transparent there is just

08:54

one problem that I'm realizing literally

08:57

right now I forgot about

09:00

physics yeah want to know what happens

09:03

when a block of transparent material has

09:05

variable thickness like in my case

09:08

Distortion that's what happens and so

09:11

even though the katana looks good and

09:13

it's transparent when you look through

09:15

it it's going to always distort the

09:17

objects behind it basically like you see

09:20

here and even though I actually like

09:21

this Katana and I spent three days

09:23

working on it I already wrote the title

09:26

of this video and I don't want to

09:27

clickbait you so the sword has to be

09:30

more invisible than that now the problem

09:32

is that I would always need a bevel to

09:34

make the sword sharp and a bevel creates

09:37

Distortion but what if what if I try to

09:40

keep the thickness consistent as long as

09:42

I can and then make a really short

09:46

bevel by doing that in theory the entire

09:49

sword will be invisible and only a small

09:51

part of it would create distortions so

09:54

to confirm the theory I tried making a

09:56

small sample with this new concept and

09:58

it turned out honestly great let's make

10:01

another

10:03

sword so I drew a new sword cut it out

10:06

of the panel with the band saw flat in

10:08

the edges and like that had the new Rush

10:10

shape of the katana then I made a new

10:12

shorter bevel on the Belt grinder and

10:14

even though this took a while like a

10:17

long long while the new Edge came out so

10:21

much better than the old one so after

10:23

polishing it and polishing the spine of

10:25

the blade and turning my hand into a

10:27

tomato after one one day of work the

10:30

final blade is ready you can obviously

10:33

still see the bevel and the bevel still

10:35

distorts what's behind it but besides

10:38

that now the entire blade is completely

10:41

transparent for comparison this is how

10:43

version one of the katana looked and

10:45

this is how it looks now I really like

10:48

this and the more I look at this thing

10:50

the more I can't wait to test it the

10:52

katana is also pretty sharp now and I

10:55

know that because I randomly hit the

10:56

damm's head with the blade and this

10:59

happened so yeah it cuts at this point

11:02

to complete the katana I got to make the

11:04

handle and the guard Katana guards are

11:07

pieces of art they're often handmade and

11:09

they just look awesome but I'm a

11:12

minimalist so mine is just transparent I

11:15

actually tried to do something fancier

11:17

but I ended up right away with a chubby

11:21

Pac-Man and then it took me one day to

11:24

make this hole but at least it fits

11:26

nicely on the katana and at this point I

11:28

only got the handle left so my initial

11:30

plan was to use the acrylic block and

11:32

then carve a handle of it but besides

11:35

that taking a lot of time I fear it will

11:37

probably not come out as transparent as

11:39

I wanted because following the plan I

11:41

need to make a hole into the block and

11:43

then fit the handle into it and the

11:44

problem with hose is that they are

11:46

really hard to polish moreover I only

11:49

need to add just a few extra centimeters

11:51

on the thickness of the handle so why

11:54

can't I just glue extra polycarbonate to

11:56

it and then shape everything as a handle

11:59

well I tried on a smaller sample first

12:01

using super glue and it honestly worked

12:05

perfectly it's actually really strong I

12:08

hit it here and it didn't move so I cut

12:11

two pieces of polycarbonate with the

12:13

same dimensions of the handle and after

12:15

placing an entire super glue bottle on

12:17

each side of the handle I glued the two

12:20

pieces to it now I need to smooth the

12:22

edges and also reduce the thickness of

12:24

the Block in order to get the shape of

12:26

the final handle and I'm seeing this

12:29

just because there is no way for you to

12:31

tell but I got a big smile under the

12:34

mask there mainly because after grinding

12:36

for 30 minutes I was really happy about

12:38

how the handle was turning

12:40

out swear it's not dangerous besides

12:43

that the tape I put on the guard to

12:45

protect it didn't protect the guard at

12:47

all but it created a sort of pattern

12:50

that somehow reminds me of anime stuff

12:53

so I think I'm going to keep it this way

12:55

and since the handle already feels

12:56

pretty good in my hands I simply

12:58

finished it by polishing it as I

13:00

previously did with the body of the

13:01

sword and even though it was completely

13:03

random the glue created a unique effect

13:06

on the handle kind of looks like ice

13:10

anyways with this the katana is finally

13:13

completed and honestly I don't think it

13:16

looks cool I think it just looks like

13:19

I'm about to start my own anime Revenge

13:21

arc when I'm holding this thing I

13:24

absolutely love it of course you can

13:26

still C The Edge but everything else is

13:28

basically transparent especially when

13:30

there is ground or objects behind it and

13:33

now I want to test it though I want to

13:35

find out if this actually works like a

13:38

sword I want to see how well it can cut

13:41

and how powerful it is to find it out I

13:43

got a bunch of targets from soft to hard

13:47

pineapple watermelon and pumpkin a

13:50

wooden plank a ballistic dummy and then

13:54

a brick the plan is to try to cut all

13:57

this and see what happens to the sword

13:59

pineapple is first hardness one out of

14:02

10 a normal sword would easily cut this

14:04

but I'm not even sure if my Katana can

14:06

actually

14:07

cut let's find out well it didn't took

14:10

me much to realize three two

14:16

one that a really does

14:21

cut

14:23

hi and well I'm really happy about that

14:27

what I didn't know is that my happiness

14:29

wasn't going to last long though because

14:30

on the next attempt the second worst

14:32

thing that could possibly happen

14:40

happened no I wasn't expecting this at

14:44

all like at

14:50

all the sword snapped right after the

14:54

handle and then I stood literally 5

14:57

minutes like this trying to figure out

15:00

what why how was this possible

15:04

polycarbonate is basically unbreakable

15:07

then why did this happen the blade

15:10

itself is absolutely fine though it

15:12

doesn't even have a

15:17

scratch and then it clicked the reason

15:19

why polycarbonate is so resistant is

15:22

because it can bend a lot and absorb the

15:25

impacts and my theory is that by Glu in

15:27

extra material on the handle I just made

15:29

it way more rigid than the blade

15:32

effectively removing its ability to

15:34

bend so who says I need the handle if my

15:37

theory is right the sword without the

15:40

handle would be basically impossible to

15:42

break I'm going to use it this way and

15:44

if it works and if it's strong then I'm

15:46

going to remove the sharpness here but

15:49

if it works I mean it's perfect so

15:52

watermelon is next hardness 3 out of 10

15:55

I'm temporarily using a clo as a handle

15:57

to not cut myself and even though I'm a

16:00

little worried there's only one way to

16:02

find out what this sword can actually do

16:08

one and luckily it went through the

16:10

watermelon without

16:12

problems it doesn't cut clean probably

16:15

because of the thickness of the blade

16:17

and the fact that the blade bends a lot

16:20

but so far it cuts but I'm going to eat

16:23

this one next pumpkin hardness 5 out of

16:27

10 and this is not a normal pumpkin

16:30

besides the

16:31

shape but even my super sonic chain whip

16:34

struggled to slice one of this it's like

16:37

it's way harder than it looks and yet

16:40

the katana actually sliced this one and

16:43

also pretty

16:44

easily the cut is also fairly clean this

16:47

time and once again the blade is

16:50

completely fine now I'm getting to the

16:52

hard targets St the next one is a wooden

16:55

plank and it's pretty thick too so I

16:59

think there are three possible ways this

17:00

can go down the katana could snap and

17:03

break in half it could Bend pretty badly

17:06

and stay bended or but it's unlikely it

17:10

will break the wood to find out I set up

17:12

the wooden plank and I fix the bottom

17:14

and the top so that it doesn't move when

17:16

I hit it the problem is that I still

17:18

haven't figure out how strong this blade

17:21

actually is and at this point I really

17:24

have no idea what's going to happen all

17:26

right let's just do it

17:30

3 2

17:37

1 and well I wasn't expecting

17:44

that it doesn't even

17:46

have nothing I completely destroyed that

17:50

and dented that one and the edge of the

17:53

blade is absolutely perfect so I think I

17:57

definitely underestimated this thing let

18:00

me let me try again I'm going to try to

18:03

break that piece I thought it was maybe

18:04

just a fluke so I hit the plank again

18:08

and the same thing happened this is the

18:10

mark he

18:14

left the wood is broken and the blade is

18:17

not even dented at this point I only got

18:20

the two hardest targets left so I

18:22

quickly went back to the shop and it's m

18:24

in the edges of the handle and now I got

18:26

something like this and I wasn't

18:28

expecting it but this handle works just

18:30

as well as the old one and so I can move

18:32

on with the next test this is a

18:35

ballistic dummy it has a layer of

18:37

ballistic gelatin which should simulate

18:39

muscle tissue and it also simulate bones

18:42

I'm going to hear it twice once here on

18:45

the neck where there is a lot of gelatin

18:48

and then once on the

18:50

Skool I think it's going to break hit

18:53

one

18:57

neck

19:01

I'm checking the blade right away to see

19:03

if it's shipped or it cracked but it's

19:05

perfect all right also the dummy looks

19:08

fine though it didn't seem like the

19:09

blade went through at first oh yeah I

19:13

caught it oh no way and then I saw it I

19:16

don't know if you can see but I got it

19:18

right here and it turns out the katana

19:20

not only sliced the gelatin and went

19:22

deep oh my God but it actually shattered

19:26

the bones below it that that is a piece

19:29

of bone it's insane because after the

19:30

handle I thought it was going to be an

19:32

absolute fail and instead the edge of

19:34

the katana was as sharp as when I

19:36

started testing it this thing is insane

19:39

I love it anyways now I'm going to go

19:41

for the head three two

19:52

one now a red thing is coming out of the

19:55

head of the ballistic dummy and I wasn't

19:58

expecting it

19:59

so I'm switching to zombie mode for the

20:01

next shots to make YouTube happy and

20:03

here you can kind of see the damage the

20:05

sko got cracked from here to here and

20:09

there is a deep gut where the katana hit

20:11

and the katana itself even after hitting

20:13

the bone doesn't even have a scratch on

20:15

it this thing is crazy the last Target

20:18

though is a break hardness 10 out of 10

20:22

this is clearly a dumb test I shouldn't

20:24

do this but so far the katana destroyed

20:27

everything without getting damaged so

20:29

where is the limit I want to find that I

20:32

already know the edge is probably going

20:34

to get damaged but I can always fix that

20:36

by resharpen it but I want to see if

20:38

it's going to crack or

20:39

break and I hope

20:43

not could have chosen a smaller brick to

20:46

be fair well I got the thickest one I

20:48

could find instead anyways after a bit

20:50

of mental preparation I loaded my swing

20:53

and I hit the Brak as hard as it

20:57

could

21:05

honestly this a win little

21:09

chips and damage on the brick now I want

21:12

also try to hit a smaller brick and see

21:15

what happens to the katana and the break

21:18

and this

21:20

time the katana actually broke the break

21:24

and I was definitely happy about it but

21:26

the best part for me is not not even the

21:28

broken break is the fact that after all

21:33

that this is the only damage on the

21:36

blade then I went back to the workshop

21:38

and after fixing it and polishing it the

21:40

blade itself has a few scratches but the

21:43

edge is basically brand new Next I'm

21:45

going to build an insanely powerful

21:47

slingshot subscribe to see when it will

21:49

come out and also let me know in the

21:50

comments what you want to see me build

21:52

after that one if you like my videos you

21:53

can also get behind the scenes an early

21:56

access to the videos on patreon as well

21:57

as your name the end of the video like

21:59

you see here check it out

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InvisibleKatanaPolycarbonateSwordSwordCraftingDurabilityTestInnovativeMaterialsWeaponEngineeringMartialArtsDIYProjectExperimentation
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