Drilling system with teeth driven in opposite directions

A drilling system comprising:

• a drill bit, the drill bit defining a longitudinal axis between a distal end and a proximal end, the drill bit configured to rotate about the longitudinal axis and to cut material at the distal end, the drill bit comprising:
• a plurality of chain assemblies, each of the plurality of chain assemblies comprising:
• a chain made up of a plurality of cutters, each cutter having teeth positioned in rows extending radially around the cutter, the teeth configured to rotate axially as the teeth engage a material for cutting;
• a proximal cog with a first set of gear teeth configured to drive the chain;
• and
• a distal cog configured with a second set of gear teeth configured to engage the chain, the drill bit configured to cut material with each chain at each distal cog;
• wherein the plurality of chain assemblies comprises at least a first chain assembly and a second chain assembly, the proximal cog of the first chain assembly configured to drive the first chain assembly in a direction opposite of the proximal cog of the second chain assembly;
• and
• wherein in a moment of time, the teeth on longitudinally adjacent cutters of the first chain assembly rotate in opposite directions when they engage a material for cutting.