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 the geometric parameters of the grinding process on the precision of their shape and the shape of the worn surface of a diamond wheel were reported. The shape accuracy criteria were the diameter variation and the out-of-roundness profile shape factor for ground balls and the radial slope angle of the working surface profile and the rate of change in this angle for the worn wheel surface shape. This effect was described by adequate linear functions of process parameters from the ratio between the quantities of balls on the circumferences of their location and the eccentricity of the location of a field of ball trajectories from the rotation axis of a diamond wheel under constant overlapping between the wheel rotation axis and the outer circumference, on which the balls were placed. The values of geometric parameters, at which the studied ball grinding scheme was reasonable to apply, were given.</p>