Author : Vijay Mohan.S, Ram Kishore Vodnala and Uday Kumar Madduri

The present paper is an experimental study aiming to analyze and improve the surface finish during drilling operation by controlling the unwanted vibrations in machine tool structures using composite materials. In general unwanted vibrations results in degraded quality on machined parts, shorter tool life and unpleasant noise which must be arrested in order to ensure higher accuracy along with productivity. Aim of study is to control parameters like unwanted vibrations using different thickness of composite plates, which affects on response like amplitude of vibration and surface roughness of machined part. In present work machine tool vibration on slotted table Radial drilling machine have been reduced using composites. In this work glass fiber epoxy plates and glass fiber polyester plates are used as composites. Initially holes are drilled on each composite plate. Mild steel plate is placed on the composite plates and setup is fixed to the table of radial drilling machine using nuts and bolts. A drilling operation is carried out using glass fiber epoxy and glass fiber polyester as a substitute for the base of work piece. Amplitude of vibrations is recorded on the screen of digital phosphor storage oscilloscope of Tektronix 1000 series through a magnetic base vibration pickup and Surface roughness of machined mild steel plate is measured by surface roughness tester machine (Sv-400). The experimental results reveal that the use of composite layers have significantly improved the surface quality and reduced the roughness value by 40%.

Keywords: Radial drilling machine, vibrations, surface roughness, composite layers, glass fiber epoxy, glass fiber polyester

Article published in International Journal of Current  Engineering  and Technology, Vol.4,No.3 (June- 2014)