Rotary truing of vitreous bond diamond grinding wheels using metal bond diamond disks

Experiments on rotary truing of vitreous bond diamond grinding wheels were conducted to investigate the effects of truing speed ratio, type of diamond in the metal bond truing disks (synthetic versus natural), and diamond gri t size in the grinding wheel on the wear of truing disk and on the cylindri cal grinding of zirconia. Similar to G-ratio, a new parameter called D-rati o is defined to quantify the wear rate of the diamond truing disks. Experim ental results show that, under the same truing condition, the truing disk w ith blocky, low friability synthetic diamond has a higher D-ratio than the truing disk with natural diamond. Diamond wheels trued by the disk with syn thetic diamond also generate lower grinding force and rougher surface finis h. High truing disk surface speed, 1.8 times higher than the surface speed of the grinding wheel, was tested and did not show any improvement in D-rat io. This study indicates that mu m-scale precision form truing of the vitre ous bond diamond wheel is difficult due to excess wear of the metal bond di amond truing disk.