I recently purchased a C1 Waldown TPG, from a forum member, with the intention of using it uncoventionally on a Milling machine to true up a worn NT40 internal spindle taper, but I haven't got around to trying that yet. I also have some semi finished grinding wheel adaptors for my old surface grinder that just need the 1.250" locating diameter machined so I figured that the best way would be to grind then mounted on the actual machine spindle to ensure minimum run out on both the diameter and the face.
The results were much better than I expected.

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