i should mention that i dont intend to run both spindles at once. the machine wont have a toolchanger so i was thinking 2 spindles = two tools on hand.
i dont have any pictures of the base yet but its possible to build the bridge in a way that you could have one spindle pulled against its home and the other spindle having full range of the work area on either pallet, then park the first spindle and bring in the second. would give tooling time to cool, and allow one spindle to be built heavier for roughing and heavier cuts, then the other to be lighter and loaded with a finishing tool. two spindles should last twice as long, or atleast provide a backup option should one spindle need repair/etc.
im mostly concerned about the ability to control it without spending a fortune on some fanuc controller.