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Pink Calathea https://jonathanhiener.com/shop/p/orchid-2hgdl monthly 0.5 2020-03-31 https://images.squarespace-cdn.com/content/v1/5ce6d339a8ffbf0001a8fb20/1559327121147-RG1ANONPMAAXJKDWRODD/Ecomm_04_Orchid_005.jpg Shop - Orchid https://images.squarespace-cdn.com/content/v1/5ce6d339a8ffbf0001a8fb20/1559327125219-JCR32SDS9YYAYE56A60K/texture-orchid.jpg Shop - Orchid https://jonathanhiener.com/portfolio daily 0.75 2022-06-02 https://jonathanhiener.com/portfolio/project-two-3jraw monthly 0.5 2022-06-02 https://images.squarespace-cdn.com/content/v1/6299038a249c9f4d78296a3b/b6b15b16-0db8-4785-bf83-56ba8c92cf5b/BJP_front.jpg Portfolio - Functional Magnetic Binder Jet Printer - Overview For my Senior Design Project, I worked with a team of peers to complete a Binder Jet 3D Printer that is capable of producing metal parts with functional magnetic properties. This project was sponsored by Dr. Markus Chmielus of Pitt’s AM3 Materials Lab, who desired a prototype printer to confirm their theories on the properties of functional magnetic 3D printed components. https://images.squarespace-cdn.com/content/v1/6299038a249c9f4d78296a3b/cc7baf83-b8d6-4f47-aaa1-dc3a4966510c/Powder_fields.PNG Portfolio - Functional Magnetic Binder Jet Printer - Concept The goal of the printer is to build complex parts with arbitrary geometry which can react physically in the presence of a magnetic field. The core principle permitting this is the alignment of the magnetic fields of the metal powder particles that comprise a binder jet printed part. By aligning the magnetic domains of the individual metallic powder grains using an electromagnet during the 3D printing process, the resulting cohesive magnetic structure mimics that of a single ferromagnetic grain and therefore will strain when in the presence of a strong magnetic field. https://images.squarespace-cdn.com/content/v1/6299038a249c9f4d78296a3b/92e33da5-8156-460f-a3ab-f81872132d82/compliant.gif Portfolio - Functional Magnetic Binder Jet Printer - Make it stand out Image credit: compliantmechanisms.byu.edu https://images.squarespace-cdn.com/content/v1/6299038a249c9f4d78296a3b/f074c202-ca68-4460-a6ee-c65ccaece6f4/layout.png Portfolio - Functional Magnetic Binder Jet Printer KiCAD main board layout (top) https://images.squarespace-cdn.com/content/v1/6299038a249c9f4d78296a3b/243261bf-eae4-4f96-9f22-46b3169ebdfc/board+bottom.jpg Portfolio - Functional Magnetic Binder Jet Printer Assembled protoboard (bottom) https://images.squarespace-cdn.com/content/v1/6299038a249c9f4d78296a3b/ed0a7643-e5c3-4fb2-b013-29ba67c4eb3b/cables.jpeg Portfolio - Functional Magnetic Binder Jet Printer Populated main board with drivers, Arduino, and wiring https://images.squarespace-cdn.com/content/v1/6299038a249c9f4d78296a3b/7127e746-beca-4570-9369-f17683bcb0d0/PSU.jpg Portfolio - Functional Magnetic Binder Jet Printer Standard ATX PSU, plugged in to main board https://jonathanhiener.com/portfolio/project-one-cj22m monthly 0.5 2022-06-03 https://images.squarespace-cdn.com/content/v1/6299038a249c9f4d78296a3b/bec7bffb-2dc0-4fb6-887f-b9ab8e9118f4/Detail.PNG Portfolio - Feasibilty Analysis - Mechanical Energy Storage - I took responsibility for modeling the system, both in gathering CAD models for the commercial gearbox, lead screw and associated hardware, and in modeling custom springs, housings, and guide rods. Our design features a 5:1 gearbox from Boston Gear, six parallel compression springs for energy storage, with guide rods to prevent spring buckling, a cylindrical acrylic blast shield, and ergonomic vinyl handles. https://images.squarespace-cdn.com/content/v1/6299038a249c9f4d78296a3b/2ec7b57c-b6a5-4714-93e0-a7c39598122f/heatmaps.png Portfolio - Feasibilty Analysis - Mechanical Energy Storage - My team first used Python to model the system parametrically, with constraints of 10 Watt-Hours of required energy storage, and limits on the applied crank force we determined through human factors research. Through this process, we plotted sweeps of various mechanical properties, such as spring wire diameter, number of parallel springs, and the free length of the system to determine appropriate values for the system’s dimensions. Further analysis was completed in Python to calculate the stresses within common metric lead screws to determine an appropriate component selection. We elected to use an 2”-4 lead screw, which under a ‘fully charged’ load resulted in a factor of safety of 3.8. https://images.squarespace-cdn.com/content/v1/6299038a249c9f4d78296a3b/75029d80-df60-44c2-b442-1fe1852c4c60/Total_Iso.png Portfolio - Feasibilty Analysis - Mechanical Energy Storage In my undergraduate Mechanical Design II Course, I worked with a team of peers to complete a feasibility analysis on a mechanical energy storage device capable of storing enough energy to charge a cell phone. The primary design limitations were that the energy had to be stored in springs and be operable by a hand crank. We chose to maximize the use of off-the-shelf components while minimizing cost and footprint. Ultimately, our design (weighing in at a simulated 120lbs) proved that while springs can be effective short-term energy absorbers for mechanical systems, the long-term storage of energy is best left to other options, such as electrochemical or thermal solutions. https://images.squarespace-cdn.com/content/v1/6299038a249c9f4d78296a3b/ff572ce8-ffe8-46b0-b9fc-9261eed72380/battery.png Portfolio - Feasibilty Analysis - Mechanical Energy Storage - Cost analysis of our system resulted in a bill of material with a price tag in excess of $3500 USD. When compared to electrochemical energy storage devices, such as Lithium-ion batteries, a similar quantity of energy can be stored in readily accessible batteries for under $20 USD. Our group was easily able to determine that such an energy storage device was wildly impractical. Even without a method of converting elastic potential energy into electricity, our device required significant user effort, carried a high price tag, and was several orders of magnitude less efficient in volumetric energy storage. https://jonathanhiener.com/portfolio/pinball-machine monthly 0.5 2022-06-03 https://images.squarespace-cdn.com/content/v1/6299038a249c9f4d78296a3b/611eabab-f744-440d-b9cc-51c8805735c1/Firmware_flowchart.jpg Portfolio - Mechatronics Project - Pinball Machine - Firmware The microcontroller for the project was to be an ATMEL ATMega328P, and our group chose to write all of the code in C. The flowchart shows the general logic of the system, using interrupts for the user inputs (flipper buttons) and the ball drain detection. Since the ATMega only has two hardware interrupts, the signal from the IR sensor was read to the analog comparator, which has an additional interrupt. SPI was used to communicate with a MAXIM display driver IC, reducing the number of microcontroller pins to control the four digit 7-segment display. https://images.squarespace-cdn.com/content/v1/6299038a249c9f4d78296a3b/7811e64d-e956-4973-b2e9-f677d1e6b66c/forces2.png Portfolio - Mechatronics Project - Pinball Machine https://images.squarespace-cdn.com/content/v1/6299038a249c9f4d78296a3b/1654437470339-U1O4LEFUKHTE9XY4GGCZ/Motor_calcs.drawio.jpg Portfolio - Mechatronics Project - Pinball Machine