I am new to my Tornado 200 w/Fanuc O-T control. I am learning (?) how to check and set tool offsets ie: T0101 = Tool 1 Offset 01. Wrote a program to make a cut and then I measure and check the offsets. I have a program that uses T0606 and makes a G71 rough cut canned cycle and G70 finish cut which measure ok. Then I use G01 with T0606 and program a different rough and finish cut and the cut is .020" larger in dia. (.936 is actually .956" dia). That's when I did the tool check program. Called T0606, made a 1.100 dia cut and it measures 1.102" As a check, I called up the 1st program, called up the oversized cut portion with T0606, stopped the program and used the jog control to move the tool to the part surface with a piece of paper to check clearance. Position reads .937" but measurement is .956" I have not changed the work offset or datum shifts that I know of. I start both programs with G92 and G40. I've been reading the manuals but........Any suggestions for a new guy?