Expired grinding wheels should not be used because they can pose serious safety risks. Grinding wheels are designed to operate at a certain speed and with a certain level of abrasive material. Over time, the abrasive material on the wheel will wear down, causing the wheel to become less effective at grinding and potentially leading to an increase in heat and friction during use.
When a grinding wheel has expired, it may also become brittle and more prone to cracking, which can result in the release of dangerous flying debris during use. Additionally, expired grinding wheel may have accumulated rust or other contaminants that could cause damage to the workpiece or compromise the integrity of the wheel itself.
For these reasons, it is strongly recommended that only new, unused grinding wheels be used for grinding operations. Expired or damaged wheels should be properly disposed of and replaced with new ones to ensure safe and effective grinding.

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