The drive at the center of gravity (DCG) principle has been adopted in computer numerical control (CNC) machines and industrial robots that require heavy-duty and quick feeds. Using this principle requires accurate corrections of positioning errors. Conventional error compensation methods may cause vibrations and unstable control performances due to the delay between compensation and motor motion. This paper proposes a new method to reduce the positioning errors of the dual-driving gantry-type machine tool (DDGTMT), namely, a typical DCG-principle-based machine tool. An error prediction method is proposed to characterize errors online. An algorithm is proposed to quickly and accurately compensate the errors of the DDGTMT. Experiment results verify that the non-delay error compensation method proposed in this paper can effectively improve the accuracy of the DDGTMT.
Bibliographical noteFunding Information:
Funding: This work was supported by the National Nature Science Foundation of China (no. 51675393) and the Hubei Province Intellectual Property “Three Major Projects”: Development of new straightening process and numerical control straightening technology for motor shaft (Grant no. 2019-1-76).
© 2020 by the authors.
- Drive at the center of gravity (DCG)
- Dual-driving system
- Error prediction
- Machine tool accuracy
- Non-delay error compensation
ASJC Scopus subject areas
- Chemical Engineering (miscellaneous)
- Process Chemistry and Technology