Shown below is the Addexton Rock Lathe. Two variable speed motors enable the cutter to shape a stone the same way a machinist cuts metal. Cutting a tapper is no problem. Simply rotate the carriage to the angle desired. This unit sells for $3,000 as shown with a the tool holder powered by a 8,000 rpm variable speed motor with a 3/8" chuck. Incorporation of other tools, such as tools for core drilling small or large holes or a guild to obtain multiple stones of the same identical shapes can be provided to meet your special needs. At this time these units have 110 voltage motors only and use in other than the USA may require a transformer.