Six years ago I had to replace a couple of veranda posts. Turned out they were Oregon so I put them aside for future use.
Just got around to using them recently. I've turned several boxes on the lathe, leaving enough material on the lid to make some carvings.
To mount them on the CNC, I cut a hole in a piece of MDF with a hole saw and jammed them in with a suitable amount of paper towel wrapped around them for a tight fit, then secured the MDF to the spoil board. I also wrapped the upper portion of the lid with painter's tape, hoping to minimise tearout when the bit passed the edges. The carving was done with an engraving bit. All told, about 5 hours cutting.
Graeme Chandler (Australia)