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- [Narrator] In this video,
we're gonna use 3D animation

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to show the inside of a combination lock.

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I'm gonna go over exactly why putting in

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a three-digit combination
allows us to open the lock.

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Let's check it out.

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(electricity crackling)

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This video is sponsored by CG Boost.

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Stay tuned at the end of this video

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to discover how you can
create your own 3D animations

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using a free program called Blender.

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(upbeat electronic music)

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During most of my teen years,

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I used a combination lock at
school to open up my locker.

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Before making this video,

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I really didn't understand how it worked.

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So I did some research,
looked at a few patents,

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and then opened one up to
see what's on the inside.

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Let me show you what I learned.

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(bright music)

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Here's the case that
holds all of our parts.

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This metal curved bar
is called the shackle.

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It won't come out until the
right combination is put in.

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Then, it pops right open.

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This piece is called the lever.

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It slides right onto the bar here.

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The lever can rotate counterclockwise.

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This piece of metal wants to flex outward.

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Once it's bent inside of here,
the tension makes the latch

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want to spring back to
its original position.

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Normally, the latch would just keep going,

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but the rotation will be
stopped by this tiny bump.

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The lever also has a tiny latch here

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that is spring loaded from the inside.

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The shackle comes down,
pushes the latch in,

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and then the latch fits
right into the groove,

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and we are locked.

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When the shackle is pulled out,

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the latch is forced to rotate

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to allow the shackle to
come all the way out.

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Then, the lever springs back into place.

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Let's watch that again.

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The shackle can't come all the way out

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because of the shackle collar.

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It guides the shackle
as it slides along here.

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But it stops us once we hit the very top.

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Okay, the reason that the
locking mechanism works

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is that, if the latch can't rotate,

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then the shackle won't come out.

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This is where the three
cams come into play.

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Let me show you.

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The back place has a bar sticking out.

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It holds the three cams,
washers in between,

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and a spring at the end.

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The spring ensures that the three cams

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and the washers are all pressed together.

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Cam two and three can spin freely.

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But cam number one is
actually attached to the dial.

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So when the dial spins,
this cam spins too.

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This is what it looks
like al put together.

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Each cam has an indentation in them.

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The lock will open when all
three of them are lined up.

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You can see how the lever can now rotate,

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which allows the shackle to open.

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When these three indentations
are not lined up,

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the lever can't rotate,

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which means the shackle can't come out.

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So how do we line up the cams
by only turning this dial?

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Let's look a little closer.

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Each cam has at least one of
these teeth sticking off of it.

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You can see them better
from this point of view.

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If we turn cam one far enough,

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the tooth on cam one will
contact the tooth on cam two.

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And then if we keep turning,
all three cams move together.

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In fact, this is the first
step to opening up the lock.

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Let's walk through this
process on the inside.

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This time we're looking
at it from the front,

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so all three cams will
need to line up here.

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We turn the dial clockwise
three times to clear it.

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All three cam teeth are
in contact with each other

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and move as one.

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Now let's keep turning the dial

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until we hit the first
number in the combination,

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which in this case is 21.

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Notice how cam three is now lined up

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right where it should be.

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Now let's work on the second
number in the combination.

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This time we turn counterclockwise
one full rotation.

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Watch as the teeth from cam one

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come in contact with came
two on the other side.

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Notice how this doesn't touch cam three,

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which is still right where it should be.

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Now we keep spinning the dial

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until we hit the second
number, which is 34.

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Now cam two and cam three are lined up.

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For the last number in the combination,

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just rotate the dial clockwise

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until it lines up with the third number.

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And there we go.

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All three cams are lined
up, the lever rotates,

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allowing the shackle to come out.

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As the shackle is pushed back in,

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it comes down with a bit of a jolt,

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which is usually enough to
nudge the cams out of alignment.

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This means the lock won't
open a second time for free;

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you'll need to use the correct
combination once again.

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(upbeat electronic music)

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The animation that you've just seen

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is created with a program called Blender.

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Is use Blender to create
all of the animations

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on my YouTube channel.

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And yes, the program is completely free.

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You can even download it
right now if you want to.

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However, it takes some
dedication to learn,

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and you'll need a good teacher.

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Let me introduce you to my
friend Zach from CG Boost.

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I've been following his
channel for years now

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because he does amazing work,

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and I've learned a lot from him.

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Recently he's released a new course

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called Blender 2.8 Launch Pad.

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Check it out at CGBoost.com/JaredOwen.

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The course takes you
from the very beginning;

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you don't need any prior knowledge.

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You'll learn the fundamentals

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of Blender's tools and interface,

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which you'll then use to
create this car animation.

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After completing the course,
you'll be able to create

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almost anything you
can imagine in Blender.

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I have personally watched
the entire course,

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and I can highly recommend it

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to anyone wanting to learn 3D animation.

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Remember that Blender is free.

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And this course by CG Boost is only $59.

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Plus the first 100 people to
use my link will get 20% off.

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Just go to CGBoost.com/JaredOwen.

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(upbeat electronic music)