In the first report, the phenomenon of interference between swell out residual was mentioned with cutting edge of conical shape. However, in the actual grinding process, the flattened cutting edge plays a great part.Then, in this paper, substituting flattened edge for the frustum of a cone, the behavior and interfered phenomenon of swell out residual are described.As a result, it was found that the rate of swell out residual increased rapidly when the shape factor L/D, which was decided from diameter of the bottom of frustum L and the depth of cut D, got some proper value (critical value of shape factor). This might be closely related to the fraction area of the flank wear of abrasive grain concerning about cutting edge life, and this critical value was larger for harder materials.The interfering behavior of material, which is caused by two grooves being approached, was affected by the value of shape factor, but the position of interfered highest tip and the positions where the interference begins and the prominence is gone to be interfered, could obtained geometrically by the result with single abrasive grain.