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Tamotsu IIZUKA ， Japan society for the promotion of machirle industry ． Yahata1 − 1 − 12 ， Higashikurume city ， T｛)kyo Key W ( ) rds ：friction 、 wear 、 characteristic ， diamond， BK7 glass， ultra − precision ［ athe t． 緒 言

We investigate the wear characteristics of single crystal diamonds by experimentation of wear between single crystal diamonds and optical glass (BK7). This study's purpose is to examine the cause of diamond tool wear that occurs during glass cutting. The wear volume of diamond increases with the normal load and friction velocity. We also analyzed the friction surfaces of diamond and BK7 using Raman spectroscopy. Graphite was detected from the friction area of BK7; no diamond material was detected leading to a conclusion that the diamond changed into graphite resulting in wear.