Reduction of Lobing in Centreless Grinding via Variation of Set-Up Angles

Abstract. The growth and decay of lobes during centreless grinding have been studied by previous researchers using physical tests, identification of the roots of the Laplace transform of the characteristic equation, and time-domain simulation. In this paper, the authors have extended the latter two methods to generate stability diagrams spanning the entire practical range of machine setup angles. The authors also demonstrate that by varying the set-up angles in a prescribed manner during grinding, rapid rounding of arbitrarily lobed components can be achieved. This is verified via time-domain simulation. Suggestions for methods of altering the set-up angles are presented, including the use of twisted blades and CNC of the infeed of the regulating wheel and support blade.