Graham Medlin
Ultra-wideband (UWB) real-time location and tracking systems
Embedded Systems Scientist
Hardware & RF design, Zephyr firmware
Senior R&D Engineer
Firmware, thermal management, process control, and testing in SLA 3D-printing
Senior Multiphysics Research Scientist
Industrial research, development, and prototyping of electric motors and power electronics
US20220140668A1 - Electric Machine and Method for Manufacture
US20220357238A1 - Energy harvesting sensors and methods
WO2023218224A1 - Auxiliary windings of an electric motor for powering electronic components
WO2023012505A1 - Cooling arrangement for integrated motor-drive
ABB Corporate Research
Prototyping and concept development
Design, simulate, prototype, and test manufacturing technologies, motors, and power electronics.
CAD: Solidworks and Fusion 360
FEA and CFD simulation: Ansys, Fluent, Icepak
PCB design and layout: Altium to hand soldering QFN
Embedded programming
Develop laboratory testing facilities and prototyping capabilities.
SLA and FDM 3D-printing, CAM, CNC milling, laser cutting
Measurement: power, torque, logic analyzer, material properties
Nuts and bolts and hand tools
Reverse engineering
Safety, always
PhD Experimental neutron physics
Characterization of the PULSTAR Ultracold Neutron Source (2017)
Medlin, G., et. al., External Moderation of Reactor Core Neutrons for Optimized Production of Ultra-Cold Neutrons, J. Nucl. Eng. (2024), 5(4), 486-499; 10.3390/jne5040030
Korobkina, E.; Medlin, G.; et. al., Ultracold neutron source at the PULSTAR reactor: Engineering design and cryogenic testing, Nuc. Instr. Meth. A (2014), 767 169. 10.1016/ j.nima.2014.08.016.
Korobkina, E., Growing solid deuterium for UCN production, J. Neutron Res. (2022), vol. 24 . 10.3233/JNR-220010.
BS Physics with honors (2009)
Minors in computer science, mathematics
North Carolina State University
Graduate student, research assistant
Designed, constructed, implemented, operated, and maintained gas handling, cryostat, and high vacuum systems for solid deuterium and solid methane neutron targets, as well as apparatus for molecular spin-state conversion, Raman spectroscopy, and study of deuterium crystal growth.
Designed components in AutoCAD, Inventor, or Solidworks and fabricated in the student shop, by the precision machine shop, or outside vendors.
Programmed LabVIEW-based GUI and HMI for data acquisition and control over analog, serial, and network interfaces.
Maintained and troubleshot liquid-helium production and refrigeration system including modification of PLC programming and HMI.
Worked on Monte Carlo neutron transport models based in Fortran and C
Managed Debian Linux webserver for electronic logbook, Git, and wiki
A big fan of LaTeX and Python/Jupyter
Teaching
North Carolina State University
Head TA and lab instructor: Modern Physics, Honors and Majors Introductory Physics
Responsible for design of labs, coordination of TAs
University of North Carolina at Wilmington
TA/Group Tutor: Introductory Calculus-Based Physics
TA: Summer Ventures student research program, Computer Applications in Physics
Hobbies
Custom 3D printer builds and nonplanar slicing, UV/NIR photography, drone scanning, hardware hacking, retro video game emulation, dog & cat wrangling
The Fleet
Voron Belt
190 × 230 × 250 mm
This is a Formbot kit-built Voron 2.4 with the belt from a CR-30. It automatically prints and ejects a queue of parts or it can print infinitely long parts by slicing at 45°. This would definitely violate Markerbot/Stratasys’ patent as a product, but the infinite axis is a gimmick, so there are better ways to automate a queue.
CR-10 of Theseus
300 × 300 × 400 mm
The O.G. began as a CR-10, but I have replaced almost every functional component. It currently runs Klipper with a 0.8 mm nozzle to print chunks of plastic as fast as possible.
Rat Rig
500 × 500 × 500 mm
This is my current favorite 3D printer kit. It is giant. This is an in-progress build primarily for testing features for an even larger printer such as dual AB steppers and CAN bus connectivity.
The SLA Printers
The Form 2 and Prusa SL1S mainly get used when I want a 3D print to not look 3D printed. The Form 1 doesn’t get much use. For awhile, Peopoly Moai tanks could be used, but even those are now hard to find.
