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--captions by vitac--
Www.Vitac.Com
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Captions paid for by
Discovery communications, inc.
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Narrator: today
On "How it's made,"
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Robotic arms...
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Tattoos...
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Sanitary napkins...
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And concrete pipes.
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The term "Robot" comes
From the czech word "Robota,"
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Which means "Forced labor."
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Most robots are designed
For repetitive work
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That's difficult,
Dangerous,
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Or would just bore human beings
To death.
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Robotic arms have varying
Degrees of freedom,
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Meaning they can pivot
In different ways.
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A robotic arm
Resembles a human arm.
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It has a shoulder,
An elbow, a wrist, and a hand.
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The shoulder is actually
A stationary base
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To which the rest is attached.
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An engineer first designs
All the parts on a computer.
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Then those plans
Go into action.
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To form the base's outer casing,
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They bend steel sheeting
Into shape
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Using a computer-guided press.
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Next they paint the casing
In powder paint,
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Using an electrostatic process
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That guarantees
A thorough, even coat.
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They run a negative
Electrical charge to the casing
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And a positive charge
To the paint particles.
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This makes the casing draw
The paint to it like a magnet.
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Once the paint on the base
Casing dries,
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They use silk-screen printing
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To apply what's called
The "User diagram."
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It illustrates which parts move
Where and how.
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Now they build the robotic arm's
Hand, called the end effector.
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Robots can be outfitted
With all sorts of end effectors.
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Here they're making a gripper,
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Whose two claws come together
To grasp and carry objects.
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To make each claw,
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An automated metal drill cuts a
Groove lengthwise and widthwise
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In a piece of aluminum.
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They assemble
The electrical circuit board
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That will later
Go inside the base.
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The robotic arm's six separate
Motors will plug into it.
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Next they assemble the
Mechanical parts of the base.
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First the motor
That makes the arm rotate,
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Then the gear that goes on
The vertical shaft
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Holding the robotic arm upright.
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When the motor makes
The gear and the shaft turn,
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The robotic arm turns with it.
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At the arm's shoulder level,
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They install a system
Of four pulleys.
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Each consists of two plastic
Wheels on a separate axle
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With a rubber belt running
Between them like a clothesline.
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The belt has little teeth
That grip grooves on the wheels.
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It rotates the wheels,
Making the robotic arm move.
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Each joint in the robotic arm
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Is capable of and programmed for
A specific range of movement.
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Like the human arm,
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The combination
Of these movements
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Manipulates the end effector.
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They plug an electrical wire
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That links the gripper
To the shoulder
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Into a circuit board
Located in the shoulder.
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Then they screw the entire arm
To the base.
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They link up the wires from
The circuit board in the base
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To the motors in the shoulder.
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To do this, they have to bunch
The wires, 48 of them in total,
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And thread them
Through the shaft
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That attaches
The base to the arm.
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Once everything's connected,
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They fine-tune and test
The gear and pulley systems
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To see if they run smoothly.
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Now they can install
The gripper
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And the shaft and gear system
That operates it.
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Turning the gear one way
Opens the grip.
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Turning it the other way
Closes it.
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Now they mount the assembled
Gripper to the forearm,
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Plugging its motor
Into a circuit board
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That they've already
Installed there.
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They plug the wires
From all six motors
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Into the main circuit board
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Which they then install
At the back of the base.
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The robot controller --
The brain that runs the arm --
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Is a separate unit.
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It controls everything
Connected to the circuit.
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To move the robot,
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The computer
Inside the controller
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Switches on
All the necessary motors.
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It can control eight motors --
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Six in the robot
And two optional accessories.
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You can program it
To perform a variety of tasks.
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From start to finish,
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It's taken just under 30 hours
To assemble this robotic arm.
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It can lift up to 10 pounds --
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About the weight
Of a full-grown cat --
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And it can move at a speed
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Of a little over
One mile per hour.
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Most robots
Are reprogrammable --
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Meaning that to change
Their behavior,
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You simply write a new program.
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From an employer's perspective,
Robots may be the ideal workers.
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Granted, they have no ideas
Of their own,
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But their productivity
Is constant,
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They never call in sick,
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And they never take
Lunch or coffee breaks.
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Narrator: tattooing dates
At least as far back
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As the bronze age.
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A 5,000-year-old body
Found in a european glacier
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Had several tattoos
On his skin.
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Archaeologists have even
Uncovered
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What they believe are stone age
Tattooing instruments --
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Sharp bone needles
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And clay disks
Containing mineral pigments.
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Walk into a tattoo parlor
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And the vast selection
Of elaborate designs
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Will astound you.
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Once you make your choice,
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The tattoo artist
Traces the image.
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Next, he places the traced image
On carbon paper
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And re-traces the lines.
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This creates a carbon outline of
The tattoo on the reverse side.
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The artist will use his
Blueprint, as it's called,
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As his guide.
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He cleans the customer's skin,
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Then firmly presses
On the blueprint.
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The carbon image
Transfers easily
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Because the skin is damp.
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Now it's time to construct
The needles.
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Most tattoos require
Two needles --
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One to make the outline
Of the image,
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The other to shade
And color it in.
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Each needle is made up of
As many as 20 smaller needles.
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The artist aligns these
Small needles in a jig,
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Then solders them together
Onto one end of a steel rod.
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There's an eye on the other end.
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The number of small needles
In a needle
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Depends
On the tattoo design --
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How thick the lines are,
How big its colored areas are.
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The finished needles go into
An autoclave to be sterilized.
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That takes 20 minutes
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00:08:13,137 --> 00:08:17,896
At precisely
338 degrees fahrenheit.
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The tattoo artist uses that time
To assemble the tattoo gun.
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After cleaning the frame
With rubbing alcohol,
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He installs the motor,
Called the coil.
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When an electric current
Runs through the coil,
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It oscillates the needle
At up to 50 times per second.
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Once the two needles
Are sterilized,
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He takes the one for outlining,
Called the liner,
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And slides it
Into the tattoo gun.
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He hooks the eye on
The other end onto the spring.
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As the spring moves
Back and forth,
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It moves the needle
Up and down.
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The tattoo artist stops
And starts it with a foot pedal,
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Like a sewing machine.
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Time to tattoo.
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He turns on the power supply
To 10 volts
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And dabs the needle
In the ink cap.
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The gun sucks up the ink.
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Some petroleum jelly
On the skin
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Helps the needle
Glide more easily.
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He begins by tracing the lines
Of the blueprint.
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The needle punctures the skin
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At a rate
Of up to 3,000 times per minute,
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Injecting micro-particles
Of ink,
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Which intermingle with the cells
Of the dermis,
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The skin's second layer.
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The artist continually
Wipes away the excess ink
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To keep his work area clean.
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After finishing the outline,
He reapplies petroleum jelly.
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This seals the pores of the skin
And prevents bleeding.
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Then he changes
To the other needle
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And begins shading
And coloring the image
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With a back-and-forth movement.
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He applies one color at a time,
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Overlapping them to ensure
Thorough and even coverage.
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The needle can penetrate
From .04 to .15 of an inch,
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And a good tattoo artist
Knows just how deep to go
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To create the different parts
Of the image.
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For example, he has to inject
The outline the deepest,
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But going too deep
Can tear the skin
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And cause excessive pain
And bleeding.
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But not going deep enough
Misses the dermis
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And leaves marks after healing.
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The cells of the dermis
Are remarkably stable,
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So tattoos last a lifetime.
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This tattoo has taken
Approximately 45 minutes to do
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From start to finish.
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The area will dry and scab over.
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Then the scab will fall off,
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And this body art
Will be ready for exhibition.
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Narrator:
Believe it or not,
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World war I led to the invention
Of disposable sanitary napkins.
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00:11:12,551 --> 00:11:14,448
American nurses
Serving in france
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Discovered that the bandages
They used for the troops
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Could double as very absorbent
Menstrual pads.
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This led the bandage company
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00:11:22,241 --> 00:11:26,724
To introduce disposable
Sanitary napkins in 1921.
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00:11:31,724 --> 00:11:36,000
Today's disposable sanitary pads
Are made of layers of cellulose,
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Combined with super-absorbent
Polymer powder.
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00:11:38,758 --> 00:11:41,103
Polymer is
A fluid-absorbing chemical
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00:11:41,103 --> 00:11:43,586
Derived from either
Petroleum or wheat.
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00:11:43,586 --> 00:11:45,000
Cellulose is the fiber
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00:11:45,000 --> 00:11:47,896
That makes up the cell wall
Of trees and plants.
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00:11:47,896 --> 00:11:49,241
It also retains fluid.
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00:11:49,241 --> 00:11:51,862
Pulp and paper companies
Grind and moisten it
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00:11:51,862 --> 00:11:54,413
To form a product called pulp.
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00:11:54,413 --> 00:11:56,413
Producing sanitary napkins
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00:11:56,413 --> 00:12:00,413
Begins with 20-inch-wide rolls
Of cellulose pulp.
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00:12:00,413 --> 00:12:03,793
The rolls feed one long machine
That does everything.
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00:12:03,793 --> 00:12:06,586
First, knives spinning
At 3,000 thousand rpm
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00:12:06,586 --> 00:12:09,241
Shred the pulp
Into a fine fluff.
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00:12:09,241 --> 00:12:12,827
Then the machine sprinkles
That fluff with polymer powder.
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00:12:15,448 --> 00:12:19,000
The polymered fluff then travels
Through what's called the doser,
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00:12:19,000 --> 00:12:20,620
A device that measures out
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00:12:20,620 --> 00:12:23,275
The required amount of fluff
Per pad layer.
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00:12:23,275 --> 00:12:27,724
The machine then suctions
Each dose into a closed chamber
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00:12:27,724 --> 00:12:31,206
Where an air current blows it
Into a pad-shaped mold.
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00:12:31,206 --> 00:12:34,275
Then another air current
Blows it out of the mold
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00:12:34,275 --> 00:12:38,034
Onto a wheel that transfers it
To a conveyer belt.
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00:12:38,034 --> 00:12:41,448
The machine simultaneously
Makes a second pad layer.
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00:12:41,448 --> 00:12:43,310
This one is smaller,
Rectangular,
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00:12:43,310 --> 00:12:46,137
And at least double
The density of the first layer,
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00:12:46,137 --> 00:12:50,137
Meaning it has more cellulose
Compressed into a smaller size.
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00:12:50,137 --> 00:12:52,551
The compression roller
Also embosses a pattern
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00:12:52,551 --> 00:12:54,620
That will disperse
The menstrual flow,
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00:12:54,620 --> 00:12:56,034
Helping absorption.
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00:12:58,275 --> 00:12:59,758
This demonstration
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00:12:59,758 --> 00:13:03,482
Shows the critical absorption
Role the polymer powder plays.
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00:13:03,482 --> 00:13:07,448
It can retain
Up to 40 times its volume.
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00:13:07,448 --> 00:13:09,827
As the polymer soaks up
The liquid,
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00:13:09,827 --> 00:13:13,206
It transforms from powder
To gel.
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00:13:16,586 --> 00:13:20,896
Different types of polymers
Have different reaction speeds.
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00:13:20,896 --> 00:13:23,793
This type absorbs
At average speed.
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00:13:25,379 --> 00:13:26,793
This will be a two-layer pad.
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00:13:26,793 --> 00:13:28,724
The number of layers
And their weight
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00:13:28,724 --> 00:13:31,000
Depends on the degree
Of menstrual flow
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00:13:31,000 --> 00:13:33,068
A pad is designed to absorb.
238
00:13:33,068 --> 00:13:35,931
Now the machine's
Conveyor belts merge,
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00:13:35,931 --> 00:13:37,862
Bringing the two layers
Together.
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00:13:42,758 --> 00:13:46,620
Now the machine sandwiches the
Layers between plastic sheets.
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00:13:46,620 --> 00:13:48,275
The top one is perforated
242
00:13:48,275 --> 00:13:52,000
To allow fluid to pass to
The absorbent layers underneath.
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00:13:52,000 --> 00:13:54,793
The bottom one
Acts as a leak-proof barrier.
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00:13:54,793 --> 00:13:57,310
A roller stamps
The contour of the pad,
245
00:13:57,310 --> 00:14:00,758
Sealing the absorbent layers
Inside.
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00:14:00,758 --> 00:14:03,724
Now the machine applies glue
To a paper strip
247
00:14:03,724 --> 00:14:06,310
And to a pair of small
Paper rectangles.
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00:14:06,310 --> 00:14:08,827
It slaps the strip on the back
Of the pad
249
00:14:08,827 --> 00:14:12,034
And the rectangles on the
Side flaps, called the wings.
250
00:14:12,034 --> 00:14:14,103
To secure the pad to underwear,
251
00:14:14,103 --> 00:14:17,103
You remove the paper
To expose the adhesive.
252
00:14:19,206 --> 00:14:21,896
The pads are still connected
To each other.
253
00:14:21,896 --> 00:14:24,586
A cutting die
Excises each one.
254
00:14:24,586 --> 00:14:26,896
Abrasive foam on either side
Of the die
255
00:14:26,896 --> 00:14:31,413
Grips then pulls away the
Material surrounding the pads.
256
00:14:38,655 --> 00:14:41,724
A vacuum then sucks
This excess away.
257
00:14:44,896 --> 00:14:47,758
Now the pads
Move onto the packaging line.
258
00:14:47,758 --> 00:14:50,241
The equipment first folds over
The adhesive wings,
259
00:14:50,241 --> 00:14:53,655
Then folds each pad in three.
260
00:15:06,103 --> 00:15:09,517
The folded pads
Now go into plastic wrap.
261
00:15:15,862 --> 00:15:19,068
A hot, iron-like device,
Called an embossing press,
262
00:15:19,068 --> 00:15:22,000
Seals the plastic
Around each pad.
263
00:15:22,000 --> 00:15:24,275
Then a knife cuts in between
The pads,
264
00:15:24,275 --> 00:15:26,724
Separating them
Into individual pouches.
265
00:15:29,551 --> 00:15:32,413
Next, two belts sandwich
The pouches
266
00:15:32,413 --> 00:15:34,586
And carry them down
To the stacker,
267
00:15:34,586 --> 00:15:37,965
Where an automated counter
Lines them up for packaging.
268
00:15:44,965 --> 00:15:46,827
As a vacuum opens the bag,
269
00:15:46,827 --> 00:15:48,896
A mechanical arm
Inserts the pads.
270
00:15:48,896 --> 00:15:52,206
The equipment
Then seals the bag shut.
271
00:15:52,206 --> 00:15:55,862
Everything you've seen happens
At an impressive pace.
272
00:15:55,862 --> 00:15:57,448
From start to finish,
273
00:15:57,448 --> 00:16:01,758
It takes just 40 seconds to make
And package a sanitary napkin.
274
00:16:14,896 --> 00:16:17,793
Narrator: most underground
Sewer and drainage pipes
275
00:16:17,793 --> 00:16:20,413
Are made of reinforced
Dry-mix concrete.
276
00:16:20,413 --> 00:16:22,068
"Reinforced" refers to the fact
277
00:16:22,068 --> 00:16:24,172
The concrete
Has steel bars inside it
278
00:16:24,172 --> 00:16:26,206
For added structural strength.
279
00:16:26,206 --> 00:16:28,827
"Dry-mix" refers to the type
Of concrete.
280
00:16:28,827 --> 00:16:31,551
You can mold it
Then immediately extract it,
281
00:16:31,551 --> 00:16:33,379
And it holds its shape.
282
00:16:36,931 --> 00:16:39,862
Concrete pipes can be
As small as 10 inches
283
00:16:39,862 --> 00:16:42,758
Or as large as 11 1/2 feet.
284
00:16:42,758 --> 00:16:45,068
It has a hundred-year life span.
285
00:16:45,068 --> 00:16:47,206
Dry-mix concrete
Is made of stone,
286
00:16:47,206 --> 00:16:49,241
Coarse sand,
Portland cement --
287
00:16:49,241 --> 00:16:52,413
Which is a finely-ground blend
Of clay and limestone --
288
00:16:52,413 --> 00:16:56,172
Water, and a chemical
That acts as a water reducer.
289
00:16:58,379 --> 00:17:02,413
Trucks unload the sand and stone
Into outdoor storage bins.
290
00:17:02,413 --> 00:17:05,689
The materials automatically drop
Onto a conveyor belt
291
00:17:05,689 --> 00:17:10,034
Which transports them to storage
Silos above the factory floor.
292
00:17:10,034 --> 00:17:12,310
The cement arrives
By cement tanker,
293
00:17:12,310 --> 00:17:14,241
Which blows it into a silo.
294
00:17:14,241 --> 00:17:16,793
All the silos feed the mixer.
295
00:17:16,793 --> 00:17:18,379
As the ingredients blend,
296
00:17:18,379 --> 00:17:21,172
The cement and water
Combine to form a paste
297
00:17:21,172 --> 00:17:23,413
That coats the sand and stone.
298
00:17:23,413 --> 00:17:26,551
The water reducer enables them
To use minimal water.
299
00:17:26,551 --> 00:17:30,034
The less water, the stronger
And more durable the concrete.
300
00:17:30,034 --> 00:17:33,000
Meanwhile,
Workers use a special machine
301
00:17:33,000 --> 00:17:34,896
To build what's called
The cage --
302
00:17:34,896 --> 00:17:36,103
A circular steel frame
303
00:17:36,103 --> 00:17:38,206
That will form the pipe's
Internal structure,
304
00:17:38,206 --> 00:17:39,655
Its backbone.
305
00:17:39,655 --> 00:17:42,620
They insert 8-foot-long
Steel rods
306
00:17:42,620 --> 00:17:44,931
In a circular configuration,
307
00:17:44,931 --> 00:17:48,862
Pushing each rod partway through
The machine to the other side.
308
00:17:48,862 --> 00:17:53,793
There, an automated spot-welder
Fuses a steel cable to one rod.
309
00:17:53,793 --> 00:17:56,068
Then the machine begins turning,
310
00:17:56,068 --> 00:17:59,068
Winding the cable tightly
Around the rods.
311
00:17:59,068 --> 00:18:02,172
Here a worker is turning
The machine manually
312
00:18:02,172 --> 00:18:05,724
Just to show us the process
In slow-motion.
313
00:18:05,724 --> 00:18:09,172
This is what it looks like
At the normal automated speed.
314
00:18:10,862 --> 00:18:13,206
As the rods
Pass through the machine,
315
00:18:13,206 --> 00:18:16,931
The welder fuses the cable to
Them in one continuous spiral.
316
00:18:21,172 --> 00:18:24,137
As the spiraled cable
Reaches the end of the rods,
317
00:18:24,137 --> 00:18:26,344
The machine's claws
Spread outward,
318
00:18:26,344 --> 00:18:28,586
Forming a wider section
On the end.
319
00:18:28,586 --> 00:18:30,896
This is called
The bell section.
320
00:18:34,137 --> 00:18:36,379
Workers position it
On a base ring
321
00:18:36,379 --> 00:18:38,551
Designed to hold the cage
In place.
322
00:18:38,551 --> 00:18:41,620
Then they close a hinged
Steel mold over it.
323
00:18:41,620 --> 00:18:44,103
Now they're ready to pour
The concrete.
324
00:18:44,103 --> 00:18:46,068
A forklift transports the mold
325
00:18:46,068 --> 00:18:48,586
To a machine called
The packer head.
326
00:18:48,586 --> 00:18:51,413
They position the mold
Directly under it.
327
00:18:55,827 --> 00:18:59,206
A long, drill-like screw
Descends into the mold.
328
00:18:59,206 --> 00:19:00,689
As concrete pours in,
329
00:19:00,689 --> 00:19:04,068
The screw turns at high speed,
Moving up and down.
330
00:19:04,068 --> 00:19:08,000
Its blades propel the concrete
Outward against the mold walls,
331
00:19:08,000 --> 00:19:09,965
Forming the pipe.
332
00:19:09,965 --> 00:19:14,413
This process is called
Centrifugal projection forming.
333
00:19:22,275 --> 00:19:25,172
The process for making
Large-diameter pipes
334
00:19:25,172 --> 00:19:26,620
Is slightly different.
335
00:19:26,620 --> 00:19:30,827
A welder fuses spacers to
The cage, both inside and out.
336
00:19:30,827 --> 00:19:33,931
These will center the cage
Inside the mold.
337
00:19:33,931 --> 00:19:37,000
Workers position the cage
Onto a base ring,
338
00:19:37,000 --> 00:19:39,000
Then lower the outer part
Of the mold --
339
00:19:39,000 --> 00:19:41,137
Called the outside form --
Over it.
340
00:19:45,068 --> 00:19:46,827
After securing it to the ring,
341
00:19:46,827 --> 00:19:50,034
They lower the unit over
The smaller, inner part of mold,
342
00:19:50,034 --> 00:19:53,275
Called the inside form.
343
00:19:57,896 --> 00:20:00,068
An overhead funnel
Pours concrete
344
00:20:00,068 --> 00:20:02,724
Into the cavity
Between the two mold forms.
345
00:20:06,758 --> 00:20:10,000
Powerful electrical vibrators
Shake the mold.
346
00:20:10,000 --> 00:20:14,689
This forces the thick concrete
Downward, filling the cavity.
347
00:20:14,689 --> 00:20:17,482
This process is called
Vibration forming.
348
00:20:19,517 --> 00:20:21,551
With either
Pipe-forming technique,
349
00:20:21,551 --> 00:20:23,724
The molded concrete
Is quite fragile,
350
00:20:23,724 --> 00:20:27,758
So the molds go off to
The curing warehouse to harden.
351
00:20:27,758 --> 00:20:29,241
There, workers remove them,
352
00:20:29,241 --> 00:20:32,034
Leaving the pipes
Standing upright.
353
00:20:41,275 --> 00:20:45,241
Steam hoses transform the curing
Warehouse into a sauna.
354
00:20:45,241 --> 00:20:48,689
The temperature rises
To 140 degrees fahrenheit,
355
00:20:48,689 --> 00:20:51,000
The relative humidity 100%.
356
00:20:51,000 --> 00:20:55,103
The concrete hardens
In about 12 hours.
357
00:20:55,103 --> 00:20:57,241
Concrete pipes
Buried underground
358
00:20:57,241 --> 00:21:00,586
Have to be able to withstand the
Weight of the earth above them,
359
00:21:00,586 --> 00:21:04,068
So the company subjects sample
Pipes to extreme pressure
360
00:21:04,068 --> 00:21:06,724
To test their
Maximum resistance.
361
00:21:06,724 --> 00:21:11,206
Concrete pipes join together
With watertight rubber gaskets.
362
00:21:18,068 --> 00:21:20,241
If you have any comments
About the show
363
00:21:20,241 --> 00:21:22,896
Or if you'd like to suggest
Topics for future shows,
364
00:21:22,896 --> 00:21:25,000
Drop us a line at...
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