On 2010-07-28, Lloyd E. Sponenburgh lloydspinsidemindspring.com wrote:
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?"

No, it is tapered so that the sprocket would lock on the hub.

It is from some old Indian motorcycle. I am not a motorcycle guy and
have no knowledge or interest in them. But my friend does. This is
perhaps a 90 year old sprocket that needs to be reproduced. I would
guess that the angle on it is not standard.

i