I wanted to share some content of the type of things we do on a daily basis pertaining to scraping and rebuilding. In this instance the customer had issues with the column leaning forward creating squareness issues in Z and Y, which happens to most of these large HBM's. Makino factory spec is 12 microns per meter and this machine was showing out about 45 MPM. The first step we had to do was level the X bedways to create a baseline for alignment checks and we got it to ~0 in the Z direction(no twist) and then about 5 micron overall in the X direction using electronic precision levels. The next step was to remove the almost unbelievable amount of covers Makino uses so we could get the column out the front of the machine and the overhead crane gave us about 3 inches of clearance to make for a nice pucker factor. We used i-beam stands to sit the column on and we ended up doing all of the prep and scraping overhead and never had to lay the column down. Doing it this way is what I believe is a major key to running a profitable job and reducing various costs to the customer i.e riggers, more disassembly and much more time between rubs. We ended up getting the Z bed level to the same specs of X before finally reassembling the machine. At the end of the scraping process the Z-Y squareness was down to 6 micron per meter and the X-Y squareness was 3 MPM. Spindle point was out 1 micron in the X direction over a 330mm tram. It all sounds simple when reading the process but I didn't include the hundreds of pounds of chip removal, dozens of metal splinters and hours of pressure washing parts but as they say, You'll have that on them big jobs.