Look at paragraph 7.5.3.3. It explains the T word format. Tool 1 may have a number of entries in the tool table with different parameters set. The last two digits tell the program which tool table line to use. For example tool 1 may have 2 entries with different x offsets. This would allow the same tool to be used for parts that are on the high side of a tolerance band and for parts that are on the low side of a tolerance band. Say you had a nominal ?25 diameter and you wanted it to be the maximum diameter you would have a different offset to where you wanted that to be the minimum diameter.
