Operations carried out on CNC turning steel parts after the primary machining process are referred to as secondary operations. These operations aim to improve the part's finish, appearance, performance, or tolerances. Some of the most common secondary operations for CNC turning steel parts include:

• Heat treatment: The mechanical properties of steel, including its strength, hardness, and toughness, can be changed by heat treatment. Common heat treatments for CNC turning steel parts include tempering, hardening, normalizing, and annealing.

• Surface finishing: The purpose of surface finishing procedures is to enhance the surface functionality and/or appearance of the part. Surface finishing methods like polishing, buffing, grinding, and plating are frequently used when CNC turning steel parts.

• Deburring: Burrs and sharp edges are removed from a machined item through the deburring process. For steel parts that are CNC turning, common deburring techniques include brushing, tumbling, and vibratory finishing.

• Hardware installation: The process of fastening bolts, nuts, screws, and inserts to a machined component is known as hardware installation. Usually, CNC turning steel parts have hardware installed using broaching, threading, and tapping.

It is essential to take into account the secondary operations needed to attain the right performance, tolerances, and finish when designing a CNC turning steel part. Designers can produce parts that are less expensive and easier to manufacture by being aware of the secondary operations that are accessible. It is useful to know what secondary operations were done on a CNC turning steel part in case it has an issue, like a dimensional error or a poor surface finish. Using this data, a solution can be developed and the problem's underlying cause found.