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That's a hefty job for the Sherline, but it's getting through it! For the ringing, try wrapping the pipe with a few layers of masking tape to damp the vibes. You could also try solder wrapped around it but you may not have room between ring and lathe bed for a piece of cigarette paper- let alone solder...... Ring turning should not be like a Peter Appleyard vibraphone concert at dial setting 11.
ChrisI’m learning a lot following this thread; and I’ll put it to use shortly. On my current project I need to turn a 13 inch flywheel and I have a 12 inch lathe. Ain’t gonna happen unless I take the gap insert out, but even we’re I to do that, at 70 RPM As it’s slowest speed, I’m not sure even carbide tooling would cut cast iron on a 13 inch diameter at that speed. I was thinking this would be a turntable project, and you certainly have given me some ideas on how to address that.
Did the discs ring much during turning Chris, like the rims were? Just curious.