This study explored the feasibility of statistical process control diagrams used in surface grinders in order to accelerate signal determination and timing for grinding wheel resharpening. When processed pieces are ground on a surface grinder, the grinding wheel gradually wears, and when engaging in continuous grinding processing, the grinding wheel surface changes from normal, congestion, chip-off to passivation. To detect the grinding wheel condition and grasp the timing for resharpening, the acceleration signals of the spindle were extracted. Then, the tine series statistical parameters were adopted for the analysis. The extracted statistical characteristic parameters of the grinding wheel condition were extracted, and the statistical characteristics parameters were entered into the statistical process control. Control diagrams were used to monitor whether or not the statistical characteristic parameters were out of tolerance. The time out of tolerance was the timing for grinding wheel resharpening.