aluminium funnel cone

[e2karnivor]

I'm new to the metal lathe world and came to a project that I don't know how to do. I need to make several mini funnel shape cones with a center hole just like any funnel but in aluminium and mini size. I have an idea on the out side cut but not how to do the inside cut. I have read articles but still not clear since I'm more a visual guy. Any videos to show how this is done?