| 摘要 |
A shaped diamond wheel, at certain height, determined by both the type of grinding wheel which is being used and the working stage, is provided with a rotating feeling pin, consisting of a metal element a few millimeters high which projects for few hundreths of a millimeter with regard to the shape of grinding wheel. The rotating feeling pin does not interfere with the working of stone, with the exception of very small portion of stone which come into contact with the rotating feeling pin.
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