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A Faraday disk dynamo is a DC generator, producing an emf that is constant in time. It consists of a conducting disk that rotates with a constant angular velocity in the magnetic field, perpendicular to the disk's plane. The rotation of the disk causes a change in magnetic flux, which induces an emf, causing opposite charges to develop on the rim and in the center of the disk. The polarity of the induced emf can be determined by the direction of the magnetic field and the direction of the...
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AC/off-grid photovoltaic powered open-source ball mill.

Maryam Mottaghi1, Motakabbir Rahman2, Apoorv Kulkarni3

  • 1Department of Mechanical and Materials Engineering, Western University, London, Canada.

Hardwarex
|May 15, 2023
PubMed
Summary

This study presents an affordable, open-source ball mill fabricated using digital manufacturing. This accessible design enables nanoparticle production even in off-grid settings, overcoming traditional limitations of cost and energy access.

Keywords:
3-D printingBall millGrindingMechanical grindingOpen hardwareOpen-source hardware

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Sustainable Technology

Background:

  • Ball milling is a standard comminution technique with advantages in capacity and reliability.
  • Traditional ball mills are often expensive, energy-intensive, and heavy, limiting their accessibility.
  • Lack of reliable grid electricity further restricts the use of ball mills in remote or developing regions.

Purpose of the Study:

  • To develop a low-cost, customizable ball mill using free and open-source hardware (FOSH) principles.
  • To enable distributed digital manufacturing of milling equipment for wider accessibility.
  • To create a ball mill suitable for diverse scientific applications, including off-grid environments.

Main Methods:

  • Fabrication of a ball mill utilizing free and open-source hardware and distributed digital manufacturing.
  • Implementation of a highly-customizable design for adaptability to various needs.
  • Integration of a switchable power system for both grid-tied (AC) and off-grid (solar/battery) operation.

Main Results:

  • The open-source ball mill was fabricated at a reduced cost (<$130 for AC, <$315 for off-grid).
  • The design allows for particle size reduction from millimeter to nanometer scale, demonstrated with silicon.
  • The solar-powered option enhances portability and reliability for field applications.

Conclusions:

  • The FOSH ball mill offers a cost-effective and accessible solution for comminution, particularly for nanoparticle production.
  • This approach democratizes access to advanced materials processing technology, even in resource-limited settings.
  • The customizable and portable design supports a broad range of scientific research and industrial applications.