You need to employ serious dust control at the lathe, not only to keep the place clean but to protect your son's lungs as well. Turning and finish sanding can produce very fine dust that is about the same size as enamel powder. If you're collecting dust at the source then you should not have a problem. Remember that dust collection for turners is just as important as ventilation for torch workers. Granted, way too many people ignore this in both areas, but it is true and should be taken seriously.
Robert
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