if i'm not mistaken, i remember seeing somewhere that 58mm x 8 tpi was the spindle dimensions
i have a shenwai 1236, i should pop the chuck off and see if i can verify.
Doc, I have seen Imperial threads on a metric machine and metric threads on a Imperial machine, but I have never seen a thread spec with a metric diameter and an Imperial pitch, at least not by design. Woe is me.