Irish Researchers Examine Benefits of Kinematic Error Modeling & Error Compensation in 3D Printing

Share this Article

While 3D printing has certainly hit the mainstream, industries of all sizes have been using the technology to their benefit due to greater affordability, self-sustainability in creating as the middleman can be eliminated, speed in turnaround for projects—and the ultimate, as objects and projects can now be created that were not thought (or even thought of!) possible previously.

Researchers like Shane Keaveney, Pat Connolly, and Eoin D. O’Cearbhaill—hailing from Dublin—are continuing to refine 3D printing, as outlined in a recently published paper, ‘Kinematic error modeling and error compensation of desktop 3D printer.’

The Irish research team focuses mainly on the benefits of CNC systems, along with using ISO standards for error assessment (namely, the ballbar method in ISO 230-4). In detailing basic error compensation models, the researchers hope to contribute to new standards for manufacturing, and more specifically medical devices. They used the Ultimaker Original for experimenting with kinematic error modeling and compensation due to its simplicity and affordability for users. For assessing errors both before and after compensation, the team used a Renishaw QC10 Ballbar in machine calibration.

“The experimental program set out to investigate the geometric errors of the Ultimaker Original 3D printer and the response of the system to compensation for detected errors modeled to include squareness, scale, and backlash,” stated the researchers.

Regarding further assessments for this project, the researchers state:

“Kinematic machine errors are errors concerned with the kinematic structure of the machine. This model represents the errors of the kinematic chains that provide a representation of the effects of the errors on a given print path. These errors, which include axis alignment, axis straightness, yaw, pitch, roll, offset of center of rotation, and offset errors, can be predicted or measured directly through machine error assessment methods such as the ballbar used in this study.”

The researchers also applied backlash compensation as designated by specific algorithms examining the tool path. Compensation can only be either ‘on’ (with an offset applied) or ‘off’ (also applied along the toolpath). Overall, the experiment was successful as the ballbar was extremely precise, requiring only one test. With application of relative error compensation, the researchers noted the ‘desired result,’ along with suggesting that this model and methods could be used in other systems with Cartesian linear axes configurations.

“The approach presented here allows for rigorous tuning in a systematic and thorough manner either periodically or during the initial machine manufacturing,” stated the researchers. “The ballbar method itself can be used for frequent checking of the 3D printer’s accuracy, precision, and consistency during the manufacturing process and the machine lifetime.”

In conclusion, the research team points out that greater standards are needed to encourage consistent quality in 3D printing—and especially for medical devices.

“Higher accuracies on these low-cost systems, as controlled and tested by standardized methods such as from ISO or ASTM, enables the impact and functionality of produced components to improve considerably,” concluded the researchers.

What do you think of this news? Let us know your thoughts! Join the discussion of this and other 3D printing topics at 3DPrintBoard.com.

[Source / Images: ScienceDirect]

Control ballbar result trace in CCW direction; (top right) control ballbar result trace in CW direction showing squareness error identification as no orientation change from CCW trace; (bottom) simulated pure backlash for demonstration of effect.

Comparison of uncompensated ballbar test trace (red) versus compensated ballbar test trace (green) showing the improvement in contouring and accuracy performance.

Share this Article


Recent News

3D Printing News Briefs: December 15, 2019

Korea: 3D Printed Protection Suits for Senior Citizens



Categories

3D Design

3D Printed Art

3D Printed Food

3D Printed Guns


You May Also Like

Surgeons Turning to 3D Printing & Pre-Surgical Planning for Jaw Surgeries in Korea

In ‘Comparison of time and cost between conventional surgical planning and virtual surgical planning in orthognathic surgery in Korea,’ authors Si-Yeon Park, Dae-Seok Hwang, Jae-Min Song, and Uk-Kuy Kim explore...

Interview with Korean Firm Graphy on Developing Cutting Edge Photopolymers for 3D Printing

Whereas FDM knowledge has been spread far and wide DLP and SLA learnings are often locked away behind closed doors. Only recently have we started to see many low-cost SLA...

Interview with 3DGuru’s Inbo Song on 3D Printing in Korea

We’re all familiar with Terry Wohlers and his eponymous report. What you may not know is that there is also a Korean Terry, Inbo Song. He provides companies with research,...

Interview with Lizy Shin of Carima on DLP 3D Printing for Manufacturing

Korean companies are few and far between in 3D printing. Given the advanced state of the Korean economy and their leadership in things such as chips, phones, and other electronics,...


Shop

View our broad assortment of in house and third party products.


Services & Data

Subscribe To Our Newsletter

Subscribe To Our Newsletter

Join our mailing list to receive the latest news and updates from our 3DPrint.com.

You have Successfully Subscribed!