I spent the entire day today working on installing and calibrating the 5-axis trunnion on the Haas VF2.
My boss had a custom hoist system built to fit around the VF2 to allow easy install and removal of the 5th axis, and we installed it today. Right off the bat, the a-axis zeroed incorrectly, and I had to set it in the G54 with a dial indicator manually. I'm not sure how to change the machine code offsets, so it reads it as 0, which would be ideal, and will have to do some more research to find that.
After that, I had to bolt the 5th axis trunnion to the table and dial it in; this took quite a long time (45+ minutes) and had got frustrating toward the end of it. The basic idea was to bolt one screw down on one back and leave the other loose, then pivot off of that one until you got to the desired rotation, and secure the second one down.
From there, I probed the center of the B-axis using the Heimer probe and then checked it with a dial indicator to ensure it was correct. I then installed the Heimer tool probe and went through the whole calibration system to get all working correctly. For some reason, the right to left rotation of the tool probe was offset by quite a bit, and no matter how much you tried to adjust the set screws, you couldn't get it perfectly flat. I ended up placing a small shim at one end underneath the tool probe to raise the lower side and level it from there.
(A few months back, my boss took the trunnion off to send back to the Haas team to get one of the parts repaired. There was an issue before where surface finishes would have a weird spotty look to them when using the A and B axis.)