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That's great to hear you will have the concave base. I was thinking this yesterday but I've never had a cnc brush with one so just assumed it wasn't possible.
It just keeps getting better!
The photos below are of handles we turned back October. Note the dimple at the center of each base. I have vintage handles with concave bottoms and virtually identical dimples, so they don't really bother me. But Cody wasn't satisfied with that result, especially on handles he finished.
Shortly after these shots were taken, I had a tool-offset issue that produced a handle with the base turned about .01" too far out on the Z-axis, which is too much to properly correct by sanding. So I left the handle in the chuck, hand wrote a little program on the fly that included just the base code, and re-ran it 2-3 times, ooching the tool-path toward the chuck (i.e., Z-) a few .001s on each pass until I got it right.
I passed the off handle to Cody to finish. He noticed there wasn't any dimple, remembered it was the one I had to re-run, and suggested repeating that process on another handle to see if it achieved the same result. It did. Now it's an SOP. You can see three parallel tool-paths at the base in the NC plot posted above.
Cody's happy, but sometimes I miss the dimple.
The base diameter on the Chubbys is so large it tends to reduce the visual and tactile effects of the concavity at a given depth. Rather than increase the depth, we decided to turn a flat section extending inwards a little from the periphery before inserting code to turn the arc. (We haven't taken photos of a Chubby's base yet.)