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The paper researches a novel engineering application of Lipschitz exponent function and harmonic wavelet for detecting tool condition. Tool wear affects often the quality grade of products and is gradually formed during cutting process. Meanwhile, since cutting noise is very strong, we think tool wear belongs to detecting weak singularity signals in strong noise. It is difficult to obtain a reliable worn result by raw sampled data. We propose singularity analysis with harmonic wavelet for datadoi:10.1155/2013/489261 fatcat:smu5r3r2hfd2roxglft7ksb56m