I finally got motivated to tram my machine this morning. It's a custom build with original pro components - 24 in gantry and 48 in bed (nominal). I used the dual indicator tramming tool I previously used on my mill which has a 6 inch space between the indicator points.
The good news (good-ish anyway) is that the machine was perfect in X to start with, so I didn't have to worry about finding shims. I was a long way out in Y, which was expected because my tests had the kind of artifacts you get from an out of tram condition.
The first problem was finding an allen key that would fit behind the Hitachi router, I didn't have one that would fit, so I cut one down to fit. Once I got the mount loose I moved the machine into tram and tried to tighten it up. This didn't work - no matter how I rotated through the cap screws or how little I tightened them each time, the machine went out of tram as I got the cap screws tightened down.
Eventually I skewed the machine out of tram in the opposite direction by the amount I kept losing when I tightened the cap screws and using this method I got to within 2 thou over 6 inches.
How did you tram your machine?