·(1) The inner diameter correction of the diamond grinding wheel and the processing of positioning holes must be carried out by the factory. If the processing is poor, it will affect the product's use effect and may cause danger. In principle, the hole expansion should not exceed the original hole diameter by 20mm to avoid affecting the stress balance.

·(2) If the diamond grinding wheel is not used immediately, it should be laid flat or hung up by using the inner hole. Do not stack other objects or step on the flat saw blade, and pay attention to moisture and rust.

·(3) When the diamond grinding wheel is no longer sharp and the cutting surface is rough, it must be regrinded in time. Grinding cannot change the original angle and destroy the dynamic balance.