I agree that you SHOULD do it in one pass. But sometimes the part won't allow it. I just came from a swiss shop where there were many people better than me and they would do it in multiple passes when needed. Again, the chips are the problem.
Furthermore, the speeds recommended in the book are not for swiss. The tools in my previous shop would last for whole shifts and more. Slower is the key.
And yes, everybody knows you can only turn in Z the length of the bushing land. So to make a long shaft by multiple passes, you would have to do the length in multiple Z passes as well. Standard training in a swiss shop. |