Spindle hours are the total time a machine's spindle has actually been running — the machine-tool equivalent of miles on a car and one of the most important indicators of wear and remaining life on a used machine. Low spindle hours on an older machine suggest light use; high hours warrant a closer look at the spindle, ways and ballscrews.
Along with age, condition and control generation, spindle hours are a core input to a used machine's value — which is exactly what a Machine Blue Book valuation weighs.
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