Turning

Subject:
Chuck unscrewing from shaft

jorge
I just finished making a 15" spalted sugar maple bowl
I was sanding the inside at a slow speed and it started to wobble so I grabbed the bowl, it was then that I noticed it was unscrewing from the shaft.
Have this happened to you? I need to understand what went on, so it does not happen again. The chuck is the Vicmarc 100, new last winter, it does not have a proviso to tighten it to the shaft. The lathe is my trusty Powermatic 35-20b, 10 years old that gets used day in day out.

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