Until the mid-80s of the 20th century, most of the tungsten carbide rotaries are manufactured by hand to the production. With the increasing development of computer numerical control technology, automatic machines began to spread over the world, they can be sculpted out of relying on any groove style rotary file, and through the finishing end of the cutting to fit specific requirements.
Tungsten carbide rotary is one of the tungsten carbide products which are sintered from tungsten carbide powders, with cobalt and nickel powder as their binders. Compared to other tungsten carbide products, tungsten carbide rotary is usually made by computer controlled machines, for the dimensions and specifications are accurate and can not be easily reached through hand-working.