Iam new to machining and I am attempting to operate a 7" Gray horizontal boring mill (floor type)..the machine has an older fanuc control and on the control are three buttons (1) Bar only (2) Bar and Quill (3) Bar Lock...I can't quite figure out how these operations are supposed to work..the machine also came with 2 right angle heads that mounts to the spindle..I recently completed a 5 month school that taught me some basic machining on a small vertical mill and a small lather..I know nothing about using right angle heads and the mill I learned on didn't have the three buttons I mentioned earlier..can anyone give me some info on this subject?..does the z axis have to be in home position before i mount the right angle heads? What mode do I need to be in to switch from bar and quill to bar only? When do you use bar lock? Do u have to lock the bar before you can use bar and quill together? Any info anyone can give me would be really helpful.