Abstract <p>For the diamond grinding of ceramic silicon nitride balls based on a plane with circular feed under oscillation, some results of experimental study on the effect of their positioning scheme and processing regime on the precision of their shape and the shape of the worn surface of a diamond wheel were reported. The shape accuracy criteria of ground balls were their diameter variation and the shape factor of their out-of-roundness profile and the radial slope angle of the working surface of a wheel and the curvature coefficient of its worn surface. This effect was described by adequate linear functions for the ball diameter variation from the wheel feed depth and rotation speed and the wheel profile inclination angle and curvature coefficient from the wheel feed depth and the rotation speed of the table with the balls. The processing regime parameters, at which the studied scheme of positioning the balls is reasonable, were predicted.</p>