Well I machined my own fixture to hold two dial indicators so I can do both axis at once. I have been having a heck of a time getting it all squared. What are you guys using for shims? I have been using hand hammered brass as it's all I have at the moment. I've noticed that you can have it dead on and move from the table to the top of the travel (or my squares in this case) and it still looks good. Then you run the travel back down and suddenly it's off (I think this can be attributed to my one square flexing which I noticed at the end of the work day). Even me standing on the very sturdy MDF cabinet it is solidly bolted to is causing discrepancies.
I guess the moral is to consider everything that could possibly affect the measuring process when tramming a mill.
James