I won't! (But I'm tempted to flip it on for a half second to see what it would look like. I'm sure it would stay put, but that handle would really be moving! Maybe in back gear.)
I'm tempted to flip it on for a half second to see what it would look like. I'm sure it would stay put, but that handle would really be moving! Maybe in back gear.)
I'm afraid I just made it up as I went along--no drawings--so the "exploded" view above is probably the best I can do. I started with a 1 3/4" diameter piece of steel. The angle of the tapered parts isn't critical, as long as they match. I cut six slots in the expanding part but four would probably work as long as it fits fairly snug inside the bore of the spindle. I hope this helps.
I still haven't used it for threading, which is what I made it for, but I've used it for tapping and to finish parting off a piece which had to be "trapped" by the live center, making me nervous about finishing the parting off under power. It worked well for both of those things. I'm going to stick a label on it to remind me to never insert it without unplugging the lathe, after reading some of the comments above!
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