I have a very basic question when writing a C.N.C. program, let's say drilling one .500hole in a part .100 deep. X=0 and Y=0. I'm trying to get a understanding in referencing the part "fixture"and tool compensation reference. How ? and what reacts with what? I have a tool compensation of -11.250, that's from the top of the tool holder to the bottom of the drill. I placed that into DT. I also jogged the "Z" with the tool holder, chuck and drill in the spindle to the fixture "0" point or .100 above the part. This number is -7.150. I placed that into DF. I removed the drill from the tool holder "about 4" long" and run the program without the part and my chuck ends up about 3" above the bed and moves .100 down. I need a better understanding of the basics. When you put a E1 or H1 in a program, what table does it look at. I think H1 looks at the DT table and if it does, I don't have a understanding in measuring the "0" point of either the fixture, "part" or tool "0". I realize these a very basic questions, but I would like to get a foot hold in working with a C.N.C. I have a Fadal 4020HT.
Simple program
N1 o358(drill hole
N2 T1 M6
N3 G0 G90 S400 M3 X0. Y0.
N4 H1 D1 M8 Z-.1
N5 G98 M30
Thanks Jerry