I've been encountering some chattering while doing a finishing push cut, about halfway up the bowl from base to top, tailstock to chuck. I'll go back and try a second push cut, and the same thing happens. I can go back afterwards with a fat scraper to clean up the marks, but I'd really rather have the nice smooth finish cut.
I measured the runout on the 3520 lathe spindle and Vicmarc chucks; nothing there (spindle is perfect, chuck < .001"). I'm using an Ellsworth grind on multiple gouges (⅝" and ½"), and sharpening doesn't seem to help. This seems to have started just the last few weeks, but I don't recall that I've changed my technique, and I haven't changed any of my equipment.
What causes this chattering?
I measured the runout on the 3520 lathe spindle and Vicmarc chucks; nothing there (spindle is perfect, chuck < .001"). I'm using an Ellsworth grind on multiple gouges (⅝" and ½"), and sharpening doesn't seem to help. This seems to have started just the last few weeks, but I don't recall that I've changed my technique, and I haven't changed any of my equipment.
What causes this chattering?