Just getting started with Haas, manual machinist tool maker for 15+ years, worked with prototrak 2 and 3 axis. Very diferent animals but similar principles. My question concerns tool length offset. I see videos showing touching off the top of vise behind solid jaw using 123 block, then adding -3.000 to number. Then I see videos touching off part itself and setting zero there. It just is not clear to me the touching off the vise or table, looking for a good explanation. Do you do the first prior to your part in the chuck, then do it?