Before we start: WHAT I HAVE & HAVEN'T READ TO AVOID SPOILERS - I HAVE NOT READ WIND AND TRUTH, ONLY 1-4 STORMLIGHT & MISTBORN 1. ALL I KNOW OF MAGIC IS FROM THE COPPERMIND, IF YOU NEED MORE INFORMATION PLEASE CHECK OUT MY INTRO POST.
Alrighty then, first off lets assume that you have infinite investiture because this is going to need a STORMING lot of investiture.
Take a super large ball of steel (don't ask where I got that), like moon sized ball of steel. Now use a LOT of breaths, like a LOT. Awaken it with the command "Use Feruchemy and Allomancy to create spin using the steel ball." Now you somehow forge a connection to the infinite investiture you have, as well as somehow (not quite sure how you would do this, any thoughts?) use connection to enable it to use Feruchemy and Allomancy. Now it should start using the speed it can (theoretically) infinitely gain to make the steel ball spin. It will (eventually) become almost as fast as the speed of light. Now you just fire small ball of anything into it, and...
Any thoughts? Any ways this won't work (it almost definitely won't), and how to fix this? This is my first post (besides intro post), so I hope this is all good. Thanks!