The alternative is to reprobe frequently, up to every toolchange or even every cut if the tolerances require it.

Since the spindle is cantilevered out so far, if the front of the column gets warmer than the back, or asymmetric heating of certain other members takes palce, it will arch and lift the tool much more than the linear thermal expansion rate. This problem plagues the whole UMC line, in combination with poorly done thermal comp software. To fix it with thermal comp, they would have to add a bunch more thermocouples in several locations, and have a much more complicated compensation model. What I've heard works best on these machines is to turn off the thermal comp, and take every measure you can to keep the temperature of the machine constant within a very small window. For comparison, I get less than .001" Z change over 20°F on my CM-1's.

Look in your Windows Start Menu > scroll down to the "Mastercam" folder, and find the "Quick Reference Card". Lots of shortcuts and handy tips there! In the "Data Entry Field", instead of typing a letter, Right-Click, and you'll get the full shortcut list. Also, are you aware you can do "math" in any field with a yellow background? This is a "calculatable value field", and you can not only do simple math, but can use parenthesis as well, to form more complex calculations. For example > (0.8775/2) * 1.414