I was turning a long thin tube of 60mm dural today, no matter what speed, feed, or tool I tried, it started to sing like a demented Canary, at a frequency that was very uncomfortable. I tried with and without lube and even tried to damp the noise with a rag held on the tube, still the same ??? Then I noticed a length of foam pipe insulation laying on the work bench, I cut 50mm lengths off and with a piece of dowel I started to pack the inside. I put the tube back on the lathe and tried again.............. absolutely no noise............no ear ache.............perfect finish...............result ;D
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