I am an apprentice of CNC vertical lathe. It's Siemens in the factory, and I don't understand the T function in the book. We change knives by hand. I want to know. Yes

I suggest you learn hand lathe first, and then learn CNC knowledge after learning the basic knowledge, so that you can have more systematic knowledge! !

Tool alignment is actually to establish the workpiece coordinate system in the machine tool coordinate system. You use an external circular knife to illustrate tool alignment. As long as the tool is properly set, its coordinate system on the machine tool will be established, and it will be fine to change the workpiece. If you change the workpiece and don't know the zero point of Z, you can quickly check only the zero point of Z. ..