This document provides details about Nathan Dozier's mechanical engineering projects and qualifications. It discusses his education background in mechanical engineering and skills in CAD software and machinery. It then summarizes four of his projects: an automatic crepe maker, a reclining car seat adjustment mechanism, connecting arm optimization, and a cantilever arm structure. Each project section briefly describes the goal and some design details.

1. Mechanical Engineering Projects
Nathan Dozier

2. About Me
I'm a B.S. Mechanical Engineering graduate from
Carnegie Mellon University. I'm well versed in using
3-D modeling software such as Inventor and
Solidworks for designing mechanical parts and
assemblies and performing Finite Element Analyses.
I'm also trained in the use of machinery such as the
band saw and drill press and I have experience as an
automotive mechanical assembler. I have a lot of
project experience from my Engineering Design
classes, graduate-level CAD and CAE course and
robotics club. I want to have a career that puts me in
a collaborative environment that will allow me to
learn more about other disciplines within
engineering.

3. Automatic Crepe Maker
Batter Dispenser - Removable,
machine washable, automated
and able to hold 600 ml of
batter (4-6 crepes)
Spreader - Must be flexible
enough to allow crepe batter
to pass while spreading it
Rotating Hot Plate - Entire
heating element rotates while
heated to spread the crepe
batter and cook it evenly

4. Rotating Hot Plate
Wood board used as
base for a slip ring that
is fitted to a belt drive
which rotates the hot
plate with threaded
pegs drilled in
Acryllic Seat screwing
into pegs to keep is
stationary with a hole in
the center that allows
the turntable to make a
fitted attachment only to
the belt gear
Hot plate screwed into
turntable to allow
rotation when the belt
drive is activated

5. Batter Dispenser
3-D printed adapter part
fitted to servo motor which
connects nylon valve and
allows for an automated
controlled flow of batter.
Nylon ball valve tightly
fitted to a plastic
refillable reservoir which
connects to adapter part
and can be removed and
machine washed.

6. Reclining Adjustment Mechanism
Goal: Design and analyze a
manufacturable mechanism that
functions as a recliner for a car seat.

7. Added Parts
1. Switch Cover
2. Handle
3. Torsion Spring
4. Pin 1 - For transmitting handle
motion
5. Pin 2 - Welded at point A
6. Connecting Arm 1
7. Shoulder Screw 1
8. Connecting Arm 2
9. Shoulder Screw 2

8. Original Design
Mass - 26.9 g
Maximum Stress - 8.2 MPa
Minimum Factor of Safety - 15
Mass - 14.8 g
Maximum Stress - 61.6 MPa
Minimum Factor of Safety - 3.4
Mass - 13.8 g
Maximum Stress - 56.3 MPa
Minimum Factor of Safety - 3.7
First Optimization Final Optimization
Material is cut out of the middle where
the stress is less concentrated while
the thickness is maintained. Results in a
more reasonable factor of safety and a
reduction in material used.
Middle bar added, part thickness
reduced, overall less material cut out
Initial factor of safety is way too large.
There is a lot of room for optimization to
reduce material used.
Connecting Arm Optimization

9. Cantilever Arm
Goal: Create a
cantilever structure
with sheet metal
strips and screws that
can lift a one pound
weight on the end
with a motor/lever
without deflecting
enough to touch the
window.

10. Calculations are done to find
the moments in our cantilever
structure and to find how
much torque our servo motor
would need to handle to lift
the weight at least 2 inches.