Tool bit monitoring for on-vehicle brake lathe
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United States of America Patent
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May 15, 2012
Grant Date -
Jun 16, 2011
app pub date -
Dec 16, 2009
filing date -
Dec 16, 2009
priority date (Note) -
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Abstract
A system and method for monitoring the contact of tool bits of a lathe with surfaces of a brake disk being machined employs a vibration sensor coupled to the lathe. Signals from the vibration sensor are processed as time-averaged segments that can be grouped within time intervals; a microprocessor employs a qualifying routine to compare the signal level to a background noise threshold value and indicates as “failed” those time periods where the average signal level is not above the background noise threshold. An accumulator records the indications over a number of intervals and compares the result to a standard to make a determination of whether the lathe is likely actively cutting the disk surfaces. To isolate intermittent, high-intensity noises, a consistency routine can check further to see whether individual segments within an interval fall within a range based on the average signal level for that interval.
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