Groove Overhang Impact on the Result of Surface Roughness on Vertical CNC Milling Process

Abstract:

Computer Numerical Control (CNC) vertical milling is a cutting tool of a work piece by giving CNC G-code program to the milling machine to give the chisel end mill perpendicular to the surface of the work piece. The distance between overhang tool and holder is usually not standard causing the end mill chisel experience minimum and maximum deflection during the cutting process. This research observed the cutting and measuring the surface roughness of the specimen made of BJ37 mild steel. It is of a square shape with a rectangular cross-section cutting parameters of overhang groove, vibration and feeding from the left, the middle, and the right surface. Measurement was done by testing the surface roughness under the conditions of changing the overhang groove, vibration, and small feeding. The observations result in smaller deflection and angle to obtain Ra = 1.64 μm average minimum level of roughness using 25mm overhang with the same feeding of 0.18mm/rev. Ra = 1.64 μm is classified into Group N7 smooth, compared to the use standard 35mm overhang which obtains Ra = 1.88 μm, Group N7 normal. The minimum level of roughness can be obtained due to the smaller feeding.

• Periodical: Applied Mechanics and Materials (Volume 836)
• Pages: 191-196
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.836.191
• Online since: June 2016
• Authors: Agus Sujatmiko, Moh Hartono, R. Edy Purwanto
• Keywords: CNC milling machine, Overhang Groove, Roughness, Vibration

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