Ignoramus8984 fired this volley in
:

I need to copy a sprocket from an old motorcycle for a friend of
mine. It has a conical hub.


My first two questions would be: "Is the hub conical simply as a
casting/forging expediency?", and (if it's tapered on the i.d.) "could I
cut that with a tapered reamer instead of milling the hole?"

LLoyd