Video of Solids of Constant Width

[M250cnc]

Maybe when parting off you held the piece in a revolving chuck in the tailstock. That would still leave a mark, so take that chuck and put it on the spindle and machine the other side? It should still be on center so that could work ... probably something a bit more ingenious though

Possible some sort of turning between centers was used ('save material').

Very cold. :lol:

I guess the question to ask is was it all machined in one operation or not?

Clues, not every one had the same operations there are some subtle differences, so you now know there is more than one operation. :naughty:

:whistling: I'm enjoying this.

Phil