DEVELOPMENT OF GEOMETRIC ACCURACY MEASUREMENT OF THREE AXIS VERTICAL CNC MILLING MACHINE WITH MULTI CENTER DOUBLE BALLBAR MEASUREMENT

• Main Author: Vrince Chitra Japardi, Alwise
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/86305
• Institution: Institut Teknologi Bandung

The use of machine tools has had a significant impact on productivity in the manufacturing industry since the Industrial Revolution. Effective management of machine tools is crucial in reducing machine downtime and maintenance costs, thereby ensuring consistently high quality and precision of final products. In this context, the development of methods to measure geometric errors in CNC machines becomes essential for maintaining production accuracy and precision. This final project aims to identify and analyze geometric errors on the X and Y axes across the entire working area of a CNC milling machine using a double ballbar (DBB) measurement tool. Measurements were conducted at 18 coordinate points on the CNC machine's XY plane, considering feed rate variation at a single optimal speed for geometric error measurement, which is 3,000 mm/min. The measurement results indicated variations in deviation values at several points, which were then validated against straightness measurements obtained by a colleague using a laser interferometer. The research findings reveal significant differences in deviation values at certain points, with the maximum error recorded at 4.545 ?m at the point denoted as X4,Y2. The multi-center DBB method successfully provided a detailed depiction of the deviation distribution occurring in the CNC machine, although some limitations regarding the accuracy of the measurement results remain. Validation with more than one set of straightness data from laser interferometers, as well as further testing considering different Z-axis values, is necessary to obtain more comprehensive and thorough results.