What is the best tool for detecting cracked or broken gear teeth?

The best tool for detecting cracked or broken gear teeth is time waveform analysis. This method allows for a detailed examination of the vibration signals captured during operation. When gear teeth are cracked or broken, they produce distinct patterns in the vibration data due to the changes in impact loads and the dynamic response of the gear system.

In time waveform analysis, the vibration signal is plotted against time, which helps in identifying sudden spikes or irregularities that correspond to impacts caused by damaged teeth. By examining these anomalies in the waveform, it's possible to determine the presence and severity of gear damage. This direct observation of changes over time can provide insights into the health of the gear teeth that other methods might not reveal as clearly.

While other methods, such as spectrum analysis, can be useful in identifying frequency components related to gear faults, they may not provide the same level of detail regarding transient events as time waveform analysis. Furthermore, motor current analysis focuses on electrical signatures and would not directly indicate physical damage in mechanical components like gear teeth. Thermographic analysis of the lubricant helps in understanding temperature variations but does not provide direct information on gear tooth condition.

Thus, for effective detection of cracked or broken gear teeth, time waveform analysis stands out as the most appropriate technique.