Whether it is a surface grinder, centerless grinder, gantry grinder, etc., as long as the moving track related to the grinder is based on V-line track and parallel track, some dovetail track, the track of the grinder in the movement and operation are the use of point running-in order to make the grinder move up to produce accuracy, the bottom surface of the track of the grinder is pasted with a layer of wear plate, The cast iron of the upper track and the wear plate below are run in, and the wear plate under the shovel can achieve the overall accuracy of the grinder by shoveling the upper point small and dense under the guarantee of smoothness and accuracy. Another point is to look at the experience and feel of the shovel master, as long as these points are guaranteed, the accuracy of the grinder on the track can be solved.