Thanks for the replies. after re-reading my OP, I realized I was talking about a lathe, not a mill.
I was kind of hoping to avoid having to cut these manually - i'll have to look into the guides, or setting up a jig or something....
Thanks for the ideas - I really appreciate the help.
I'll preface this all by saying :
-I don't own a mill
-I've never used a mill
-I don't know the terminology
-I have done just about enough research to be dangerous!
I have a project where I need to cut small tubes of aluminum, brass, and possibly copper (Think cutting pen bodies in half)...