The imbalance of the grinding wheel rotating at high speed when the unbalanced centrifugal force will spindle vibration, and seriously affect the processing quality, and may even cause the grinding wheel to rupture. Larger diameter (usually more than 250mm) wheel, after a rough balance and fine balance required before use. Crude grinding wheel should be balanced in a grinder, flap wheel circumference rounded diamond pen, both ends of the surface Shuhei, then remove from the grinder grinding wheel, rough balance fine balance. Required in the circumference of an arbitrary position can remain stable.