An automatic core joiner and cutter apparatus for use in the recycling of used cores and the manufacture of new conjoined cores is disclosed. The apparatus combines an infeed unit, a milling unit, and an outfeed unit, all controlled by a PC. The used core is milled by the infeed milling bit and the core remnant is milled by the outfeed milling bit. A glue applicator applies glue to at least one of the milled surfaces and the milled surfaces are mated together to produce a new conjoined core. The infeed cutting and milling operations and the outfeed cutting and milling operations are controlled by the controller and performed at the same time.