02-16-2014, 08:55 AM
What I mean it that the threading insert seemed to stay within the path of the three previous passes.
If a part you're threading slips in a chuck that's driving it, the most common failure would be that the workpiece stops and the carbide shatters. In this case it sounded like a tiny bit of chatter, and in the next instant I noticed the end of the work had come away from the live center. That's when I retracted the tool and stopped the process. All I can assume is that there were very tiny, unnoticeable stops to the workpiece that for some reason didn't catch and didn't chip the carbide insert.
If a part you're threading slips in a chuck that's driving it, the most common failure would be that the workpiece stops and the carbide shatters. In this case it sounded like a tiny bit of chatter, and in the next instant I noticed the end of the work had come away from the live center. That's when I retracted the tool and stopped the process. All I can assume is that there were very tiny, unnoticeable stops to the workpiece that for some reason didn't catch and didn't chip the carbide insert.