Start the R point (G99 novice with caution as the workpiece non-planar translation of the next hole will crash) to protect the boring and hole wall recommended to see the instructions on the use of fixed cycle instructions that you can try to get started
The purpose of the boring tool is to stop the automatic positioning of the hole at the bottom of the hole (the direction of the tool nose is the direction when you put the knife) and then move the Q value to lift the workpiece surface G98 to G50 Z50.H * in the Z50.
G76 is a boring fixed cycle command as long as the fine boring knife when the positioning of some of the machine panel has a spindle positioning key is not in the MDI mode input M19 manual positioning spindle and then hit the HANDLE (hand wheel) mode
