Dressing tool

Abstract

A dressing tool for dressing an annular array of grinding tones disposed on a surface of a grinding wheel includes a dressing board for dressing the grinding stones and a support plate supporting a reverse side of the dressing board. The reverse side of the dressing board has a recess defined therein that has a depth terminating short of s face side of the dressing board that is opposite the reverse side thereof and corresponding to a usage-limit thickness of the dressing board.

What is claimed is: 
     
         1 . A dressing tool for dressing a plurality of grinding stones disposed in an annular array on a surface of a grinding wheel, comprising:
 a dressing part for dressing the grinding stones; and   a support part supporting a reverse side of the dressing part;   wherein the reverse side of the dressing part has a recess defined therein that has a depth terminating short of a face side of the dressing part that is opposite the reverse side thereof and corresponding to a usage-limit thickness of the dressing part.   
     
     
         2 . The dressing tool according to  claim 1 , wherein the recess of the dressing part is of a straight shape in a case where the dressing part is viewed from the reverse side thereof. 
     
     
         3 . The dressing tool according to  claim 1 , wherein the recess of the dressing part is disposed radially outwardly of a center of the dressing part in a case where the dressing part is viewed from the reverse side thereof. 
     
     
         4 . The dressing tool according to  claim 1 , wherein the recess of the dressing part is of an annular shape in a case where the dressing part is viewed from the reverse side thereof. 
     
     
         5 . The dressing tool according to  claim 1 , wherein the recess of the dressing part includes a firs recess having a first depth and a second recess having second depth larger than the first depth. 
     
     
         6 . The dressing tool according to  claim 5 , wherein the first recess and the second recess overlap each other in depthwise directions thereof.