Open-source grinding machine for compression screw manufacturing

Jacob Franz, Joshua M. Pearce*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Some of the most promising distributed recycling and additive manufacturing (DRAM) technical systems use fused particle fabrication (FPF) or fused granular fabrication (FGF), where compression screws force post-consumer waste plastic through a heated nozzle for direct 3D printing. To assist the technical evolution of these systems, this study provided the details of an invention for a low-cost, easily replicable open-source grinding machine for compression screw manufacturing. The system itself can be largely fabricated using FPF/FGF following the self-replicating rapid prototyper (RepRap) methodology. This grinding machine can be made from a cordless cut-off grinder and < $155 in parts. The new invention is demonstrated to be able to cut custom screws with variable (i) channel depths, (ii) screw diameters, (iii) screw lengths, (iv) pitches, (v) abrasive disk thicknesses, (vi) handedness of the screws, (vii) and materials (three types of steel tested: 1045 steel, 1144 steel, and 416 stainless steel). The results show that the device is more than capable of replicating commercial screws as well as providing makers with a much greater flexibility to make custom screws. This invention enables the DRAM toolchain to become even more self-sufficient, which assists the goals of the circular economy.

Original languageEnglish
Article number26
Pages (from-to)1-27
Number of pages27
JournalInventions
Volume5
Issue number3
DOIs
Publication statusPublished - Sep 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • Angle grinder
  • Compression screw
  • Cylindrical grinding machine
  • Grinding
  • Grinding machine
  • Material extrusion
  • Open hardware
  • Open-source appropriate technology
  • Open-source hardware
  • Recycling

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