[Sp1raleyes]

Hello there, I'm about 5 minutes ago new to the site.

I am currently a Lathe Set Up/Operator, and I am learning everything on my own. I have a question about a picture I have uploaded with this post, and I hope it's not to silly of a question.

-In the pic, this is the back end of a shaft I set up a lot, and need to do some reprogramming on. Here is my only question.

See how the Diameter is .500 +0/-.003? Well, my question is, once I program that diamter to be cut, I can't figure out how far to cut in Z. The 1 " dimension is where the radius of .130 will end, but where would the .130 radius begin?

I feel as if I should know this, but I am not afraid to be honest and say I don't. If anyone could please help me out with the answer to this, I would be very grateful. Thanks, and have a good day.