CNC turned parts are the result of a precision machining process that is controlled by a software program. Computer numerical control (CNC) offers the manufacturer precise control over the machining process because it minimizes the opportunity for human error. Instead, automated tools perform the process, programmed and supervised by an operator. CNC turned parts are cylindrical and available in a variety of shapes, including contoured, fillet and tapered ends.

CNC turned parts are machined from titanium, acrylic, brass, polycarbonate, nylon, copper, polyvinyl chloride (PVC), stainless steel and aluminum; CNC turning machines are able to work well with tough and rigid materials. The parts themselves are diverse and are used in bushes, pulleys, shafts, rods, hubs, tools, machine parts, flanges, nozzles, couplings, housings and more. Many industries benefit from the use of CNC turned parts because of the variety of parts and the abilities of the equipment; CNC machines are able to produce a large assortment of products from a wide range of materials with precise depths and dimensions in order to fit specific needs. These parts are used in the automotive, electronics, petroleum, defense, commercial, aerospace, marine and construction industries.
Computer-controlled turning is performed in machine shops. There are two main pieces of equipment used to produce turned parts: CNC screw machines or CNC lathes. Both work in similar ways. A round, square or hexagonal blank called a workpiece is attached to spindles on the machine, which hold it firmly in place. The blank begins to spin, and multiple automated cutting, drilling, notching and knurling tools attached to the machine apply the appropriate amount of pressure to mechanically cut away material. The tools are powered by a motor located at the machine's base that acts as the power source for all operations. These motors vary in horsepower in accordance with the size of the machine, the necessary speed and the material of the workpiece. Smoothing and finishing is completed and the finished part is removed from the machine. CNC screw machines have multiple spindles, which allows for the simultaneous machining of several parts. CNC lathes use a single spindle and a drill bit to cut away unnecessary material. Lathes using software are quickly replacing conventional lathes, which required an operator with high levels of skill, knowledge and experience. The difference between CNC turned parts and CNC milled part is in the machining process. Turned parts are rotated while the tool is held stationary, whereas milled parts are held stationary while the tool rotates.