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Analyzing machinery vibration can prevent plant breakdowns. A new weapon in the concrete producer's predictive maintenance (PdM) arsenal is vibration analysis. Here's how it works: portable data collector/analyzers are used to record and view vibration data. Then software analyzes the differences in the data to detect significant changes before machines fail. In a typical vibration-based PdM program, two types of data are measured: Overall reading and Fast Fourier Transform (FFT). The overall reading is a single number that represents all vibration energy. For data presented as an FFT, the X-axis shows the frequency of vibration in cycles per minute while the Y axis shows the amplitude of the vibration in inches per second. Buying tips and benefits of PdM are included. KEYWORDS: maintenance, plant equipment