![]() Posted in cnc hacks Tagged audacity, audio, chatter tooling, cnc, fft, spectrogram, spindle, vibration analysis Post navigation Whether it be finding bats, dumping ROMs, detecting lightning strikes, or cloning remote controls, Audacity is often the hacker’s tool of choice. Mixed in among these were spikes indicating chatter – nothing major, but still enough to measure.Īudacity has turned out to be an incredibly useful tool with a broad range of applications. then analyzed the data from the cut in the frequency domain and found the expected spindle harmonics, as well the harmonics from the three flutes on the tool. ![]() Most interesting, though, was the slight dip in frequency during the cut, indicating loading on the spindle. The white noise of the mist cooling system was clearly visible too, as were harmonic vibrations up and down the spectrum. Switching from waveform to spectrogram mode, he was able to identify a strong signal at about 5,000 Hz, corresponding to the spindle coming up to speed. The analysis begins at about the 5:13 mark in the video below, where fed the soundtrack of his video into Audacity. But like any benchtop machine, it lacks the sheer mass needed to reduce vibration, and tool chatter can be a problem. The benchtop machine is no slouch – an Avid Pro 2436 with a 3 hp S30C tool-changing spindle. ![]() To help develop that ear, did a spectral analysis of the sounds of his new CNC machine during its “first chip” outing. The angular momentum of the spindle of a modern CNC machine can be trouble if it gets unleashed the wrong way, which is why generations of machinists have developed an ear for the telltale sign of impending doom: chatter. When you’re operating a machine that’s powerful enough to tear a solid metal block to shards, it pays to be attentive to details.
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