Tombstone Horizontal Machining Center for a 500mm Pallet HMC – 12″ x 12″ x 32. HMC does not appear to have actually been used. It was with some other CNC machines that were used for a long time. Over the years, we upgraded, and finally got rid of the old CNC machines. Kept this tombstone back to sell it separately. Tombstone has never had any holes drilled in it. It has plain, machined sides. Base is made to fit a 500mm pallet for a horizontal machining center. Tombstone is bolted to a pallet from a Niigata SPN50 HMC.