Case Study On Circularity Deviation Of Top Arm Holes In Self Centering Steady Rest

A study conducted in an Small and Medium scale Enterprise SME revealed that a Vertical Milling Centre VMC frequently faces circularity deviations while machining the Arm of a Self Centering Steady Rest. A cause and effect analysis is carried out to determine the probable causes of deviations. Further more a statistical analysis of the deviations using ANOVA revealed that the circularity deviations are related to the linear worktable movement of the VMC. In order to overcome the deviations VMC was recalibrated. After recalibration of VMC an analysis on new sample revealed that there was no circularity deviations observed beyond the specified tolerance limits.