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Reason for Materials
Product and Function
ABS plastic is used in the pen top cover, pen bottom cover, clicker cover, button, clicker, ink channel, and ink tube. The plastic was used because it is cheap. It is also hard to break and able to last for a long amount of time. The carbon steel is used for the spring, ink tip, and ink ball. Carbon steel is used because the pressure put on the pen when writing is a lot. Carbon steel is tough and ink is able to travel through it. It is also cheaper than other metals. The chrome finish is put on in order to make sure the metal does not crack and to make it last longer. Rubber is used for the grip. It is cheaper, and it is comfortable to hold. It keeps the pen from slipping from your hand.
This is a Uniball Signo Rt ball point pen. The pen works by pushing the button which pushes on the clicker. The clicker pushes the ink tube up. The ink channel connects the ink tube to the ink tip. The ink tip is connected to the ink ball. The ink travels from the tube to the channel then the tip and lastly the ball using gravity. From the ball, the ink goes onto the paper. The pen's bottom cover screws into the top cover. The clip cover attaches to the pen's top cover. All the covers are used to hold the more flimsy inside parts and keep the parts inside the pen. The grip goes around the pen's bottom cover for comfort when writing. The spring goes around the pen tip. It keeps the pen tip and ball in or out of the pen's bottom cover.
Ink Tip
- Function
-Material
It transfers ink to ink ball
Carbon steel with chrome finish
Pen Bottom Cover
- Density
- Texture
- Mass
Ink Tube
Smooth and hard
7.87 g/cm^3
less than .000 lb
- Volume
- Surface Area
- Function
- Material
To cover the ink tube and hold the spring. It allows tip to come out of bottom hole.
ABS plastic
.002 in^3
.196 in^2
- Density
- Mass
- Texture
.003 lb
1.06 g/cm^3
Smooth with grooves at the top
- Function
- Material
- Surface Area
- Volume
ABS plastic
To hold ink channel in place and store ink
.08 in^3
4.836 in^2
Button
- Mass
- Texture
- Density
.002 lb
1.06 g/cm^3
Smooth with very small bumps
- Surface Area
- Volume
- Function
- Material
4.745 in^2
.05 in^3
ABS plastic
To push clicker down from outside of pen
- Mass
- Texture
- Density
.001 lb
1.06 g/cm^3
Smooth with a sharper edge
- Volume
- Surface Area
.018 in^3
.973 in^2
Pen top cover
- Material
- Function
ABS plastic
To cover ink tube and hold clicker
- Density
- Mass
- Texture
Spring
Smooth
.005 lb
1.06 g/cm^3
- Volume
- Surface Area
6.783 in^2
.128 in^3
- Material
- Function
It helps keep ink tip in or out of the pen bottom cover
Carbon steel with chrome finish
- Density
- Texture
- Mass
7.87 g/cm^3
Ridged and hard
less than .000 lb
- Volume
- Surface Area
David Starcevich and Eric Schneider
2B
.002 in^3
.42 in^2
Clicker Cover
- Function
- Material
ABS plastic
To cover the clicker and clip pen to something
- Texture
- Mass
- Density
1.06 g/cm^3
.002 lb
Smooth with few ridges and a bump
Clicker
- Volume
- Surface Area
.055 in^3
3.491 in^2
- Function
- Material
ABS plastic
To push down ink tube so pen can write
- Mass
- Texture
- Density
1.06 g/cm^3
.001 lb
Ink Channel
Smooth with some grooves and ridges
- Surface Area
- Volume
.021 in^3
1.114 in^2
- Function
- Material
To hold ink tip and transfer ink from ink tube to tip
ABS plastic
- Texture
- Density
- Mass
1.06 g/cm^3
less than .000 lb
Smooth with some curves and bumps
Grip
Ink Ball
- Volume
- Surface Area
.009 in^3
.602 in^2
- Material
- Function
Rubber
- Function
- Material
To comfort hand when pen is held and to keep from slipping
It transfers ink to paper
Carbon steel with chrome finish
- Texture
- Density
- Mass
.93 g/cm^3
- Mass
- Texture
- Density
.001 lb
Smooth and squishy
7.87 g/cm^3
Smooth and hard
less than .000 lb
- Surface Area
- Volume
3.753 in^2
.03 in^3
- Volume
- Surface Area
.002 in^2
less than .000 in^3
Exploded
Assembly