Thanks guys, it's the QC. I looked at the bit adapters again and it looks like there is the beginning of one indention on the adapter. I also think the Y gear or bearings are shot as I slid the Y/Z carriage to the center and it was grinding this time. Is there a major advantage of one chuck over the other? It looks like the Rock is easier to swap out. Thanks again for all of your advice/help.

Thanks
Bill
Hobby Central