The chuck grips the machined component by its jaws. It attaches directly to the spindle but is replaceable, so unique-sized parts can be machined. Axial cut depth. Pretty self-explanatory mainly because it displays the depth of a cut within the axial way. It's the main parameter for struggling with functions. https://zanderfvfnt.blogzet.com/precision-cnc-machining-for-dummies-46716372