RESEARCH PAPER
Linear Motion Error Evaluation of Open-Loop CNC Milling Using a Laser Interferometer
1
Department of Mechanical Engineering, Vocational School, Universitas Gadjah Mada, Jl. Yacaranda Sekip Unit IV, Yogyakarta 55281, Indonesia
Submission date: 2021-10-02
Acceptance date: 2022-02-10
Online publication date: 2022-03-24
Publication date: 2022-06-01
Acta Mechanica et Automatica 2022;16(2):124-129
KEYWORDS
ABSTRACT
The usage of computerised numerical control (CNC) machines requires accuracy verification to ensure the high accuracy of the processed products. This paper introduces an accuracy verification method of an open-loop CNC milling machine using a fringe counting of He–Ne laser interferometry to evaluate the best possible accuracy and functionality. The linear motion accuracy of open-loop CNC milling was evaluated based on the number of pulses from the controller against the actual displacement measured by the He–Ne fringe-counting method. Interval distances between two pulses are also precisely measured using the He–Ne interferometry. The linear motion error and controller error can be simultaneously evaluated in sub-micro accuracy. The linear positioning error due to the micro-stepping driver accuracy of the mini-CNC milling machine was measured with the expanded uncertainty of measurement and was estimated at 240 nm. The experimental results show that linear motion error of the open-loop CNC milling can reach up to 50 μm for 200 mm translation length.
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