Free and Open-source Control Software for 3-D Motion and Processing

Wijnen, Bas; Anzalone, Gerald C.; Haselhuhn, Amberlee S.; Sanders, Paul G.; Pearce, Joshua M.

doi:10.5334/jors.78

Cited by 40 publications

(13 citation statements)

References 15 publications

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“…13. Drops were suspended from 1.37 mm diameter nozzles and images were taken with a digital microscope with an intense backlight to increase contrast.…”

Section: Methodsmentioning

confidence: 99%

Linking Rheology and Printability for Dense and Strong Ceramics by Direct Ink Writing

M’Barki¹,

Bocquet²,

Stevenson³

2017

Sci Rep

285

212

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Direct ink writing of dense and strong ceramic objects remains an important open challenge. We develop a universal dimensionless criterion for printing such objects. Boehmite, an Al2O3 precursor, was used to assess the rheological properties leading to dense structures in ceramics manufactured by direct ink writing. Boehmite suspensions undergo time dependent gelation, thus providing a rheological laboratory of flow behaviours that can be correlated with printability requirements. We measured the evolution of rheological properties over several days and quantified the deformation of simple printed shapes at different aging times. We then identified the relevant physical parameters leading to printable suspensions. We defined a dimensionless number, Ξ, based on measured rheological properties, that predicts deformation of the printed object and determines the printability criterion. An important difference with this criterion is that Ξ necessarily accounts for capillary forces and gravitational slumping. We show that boehmite inks reach a printed shape fidelity > 90% when Ξ > 1, and that Al2O3 bars printed under these conditions can be sintered to 97% density, without printing defects, and have flexural strengths (500–600 MPa) competitive with commercial aluminas. Using Ξ, researchers can rationally design inks for printing dense materials by tailoring their rheological properties such that Ξ ≈ 1.

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“…13. Drops were suspended from 1.37 mm diameter nozzles and images were taken with a digital microscope with an intense backlight to increase contrast.…”

Section: Methodsmentioning

confidence: 99%

Linking Rheology and Printability for Dense and Strong Ceramics by Direct Ink Writing

M’Barki¹,

Bocquet²,

Stevenson³

2017

Sci Rep

285

212

View full text Add to dashboard Cite

show abstract

“…First, two sheets of HDPE were set on top of each other. Then, a water channel was formed by welding both sheets together based on a preprogrammed digital model and open-source Franklin control software [37]. Although the unit that was fabricated and tested in this study consisted of only a single stack, the fabrication process can be repeated to build multi-stack heat exchangers using the same concept.…”

Section: Heat Exchanger Geometry and Fabricationmentioning

confidence: 99%

Experimental characterization of heat transfer in an additively manufactured polymer heat exchanger

Arie

Shooshtari

Tiwari

et al. 2017

Applied Thermal Engineering

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In addition to their low cost and weight, polymer heat exchangers offer good anticorrosion and antifouling properties. In this work, a cost effective air-water polymer heat exchanger made of thin polymer sheets using layer-by-layer line welding with a laser through an additive manufacturing process was fabricated and experimentally tested. The flow channels were made of 150 μm-thick high density polyethylene sheets, which were 15.5 cm wide and 29 cm long. The experimental results show that the overall heat transfer coefficient of 35-120 W/m 2 K is achievable for an air-water fluid combination for air-side flow rate of 3-24 L/s and water-side flow rate of 12.5 mL/s. In addition, by fabricating a very thin wall heat exchanger (150 μm), the wall thermal resistance, which usually becomes the limiting factor on polymer heat exchangers, was calculated to account for only 3% of the total thermal resistance. A comparison of the air-side heat transfer coefficient of the present polymer heat exchanger with some of the commercially available plain plate fin heat exchanger surfaces suggests that its performance in general is superior to that of common plain plate fin surfaces.

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“…However, it uses a stage printing setup allowing for stationary heavy toolheads [28,29] while automatically controlling the movement of a substrate with three-axis control under a fixed perpendicular weld gun printer head ( Figure 1C). The motion controls are managed by an Arduino-based microcontroller and the free and open source 3-D motion control software called Franklin [30]. Franklin also controls the welder (e.g., on for printing and off for traveling).…”

Section: Methodsmentioning

confidence: 99%

Applications of Open Source GMAW-Based Metal 3-D Printing

Nilsiam

Sanders

Pearce

2018

JMMP

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The metal 3-D printing market is currently dominated by high-end applications, which make it inaccessible for small and medium enterprises, fab labs, and individual makers who are interested in the ability to prototype and additively manufacture final products in metal. Recent progress led to low-cost open-source metal 3-D printers using a gas metal arc welding (GMAW)-based print head. This reduced the cost of metal 3-D printers into the range of desktop prosumer polymer 3-D printers. Consequent research established good material properties of metal 3-D printed parts with readily-available weld filler wire, reusable substrates, thermal and stress properties, toolpath planning, bead-width control, mechanical properties, and support for overhangs. These previous works showed that GMAW-based metal 3-D printing has a good adhesion between layers and is not porous inside the printed parts, but they did not proceed far enough to demonstrate applications. In this study, the utility of the GMAW approach to 3-D printing is investigated using a low-cost open-source metal 3-D printer and a converted Computer Numerical Control router machine to make useful parts over a range of applications including: fixing an existing part by adding a 3-D metal feature, creating a product using the substrate as part of the component, 3-D printing in high resolution of useful objects, near net objects, and making an integrated product using a combination of steel and polymer 3-D printing. The results show that GMAW-based 3-D printing is capable of distributed manufacturing of useful products for a wide variety of applications for sustainable development.

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Free and Open-source Control Software for 3-D Motion and Processing

Cited by 40 publications

References 15 publications

Linking Rheology and Printability for Dense and Strong Ceramics by Direct Ink Writing

Linking Rheology and Printability for Dense and Strong Ceramics by Direct Ink Writing

Experimental characterization of heat transfer in an additively manufactured polymer heat exchanger

Applications of Open Source GMAW-Based Metal 3-D Printing

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