What is a Turning Operation in CNC Machining?(modern cnc machines Arlen)
- source:NEWRGY CNC Machining
How Does Turning Work?
In turning, the cutting tool feeds into the rotating workpiece which is held in a chuck or collet. As the tool moves, it cuts away material, resulting in a cylindrical shape. The depth of cut is controlled by adjusting the tool's radial position. The feed rate determines how quickly the tool moves into the workpiece. These parameters, along with cutting speed, help determine the final properties of the machined part.
Major Types of Turning Operations
There are several common turning operations that can be performed on a CNC lathe:
- Facing: Machining the face of a part to create a flat surface perpendicular to the axis of rotation. This is done using a specially-ground facing tool.
- Straight Turning: Machining a cylindrical contour parallel to the part's axis of rotation. This process creates external diameters.
- Taper Turning: Producing conical or tapered surfaces by adjusting the tool angle or offsetting the tailstock.
- Grooving: Cutting internal or external grooves using a specially-shaped grooving tool. Grooves allow space for seals, o-rings, splines, etc.
- Threading: Machining external or internal threads using a threading tool. Threads allow parts to be assembled together.
- Boring: Enlarging and smoothing internal diameters. Boring is used to achieve tight tolerances and finer surface finishes inside holes.
- Parting/Cut Off: Separating a part from the bar stock by cutting through it completely. Parting tools are specially designed for this operation.
Modern CNC lathes offer a vast array of turning capabilities that enable the production of complex parts:
- Eccentric turning: Produces non-concentric diameters by oscillating the tool or workpiece. Used to machine elliptical, cam-shaped, and other eccentric profiles.
- Interpolation turning: Combines linear and circular interpolation to generate complex contours in a single operation. The tool moves along 2 or more axes simultaneously.
- Contour turning: Machines intricate curved or profiled surfaces using programmed tool path motions. The tool follows the programmed contour shape.
- Taper turning: In addition to straight tapers, CNC lathes can cut progressive, concave, convex, and other complex tapered forms.
- Threading: Single or multi-point tools can machine a wide range of thread types, including metric, whitworth, acme, worm, and trapezoidal threads.
- Grooving: Using driven tools, grooves can be cut in angles, radii, tapered walls, and irregular patterns. Groove width can be varied as needed.
- Drilling/Boring: CNC lathes have live drilling and boring capabilities. Holes can be machined to precise diameters and geometries.
- Knurling: Using a special knurling tool, decorative slip-resistant patterns can be rolled directly into the part surface.
Benefits of CNC Turning
There are many benefits to using CNC lathes for turning operations:
- High dimensional accuracy and repeatability. CNC machines provide tolerances up to 0.0005 inches or better.
- Excellent surface finishes. Parts can be machined to fine finishes of 32 microinches RMS or finer.
- Reduced setup times. CNC automation allows fast changeover between jobs.
- Minimal manual intervention. Lathes can run unattended after initial setup.
- Increased complexity capabilities. CNC allows machining of complex geometries not possible manually.
- Fast production. CNC turning yields high machining rates suitable for production environments.
- Reduced tooling costs. Indexable carbide insert tooling has a long working life before replacement is needed.
- Safer operation. The operator does not need to directly interface with the machine during cutting.
- Reliable and repeatable. Computer numeric control results in consistent output over long production runs.
In summary, turning is an essential operation for machining precision round metal parts. Modern CNC lathes offer accurate, flexible, and cost-effective turning capabilities suitable for prototype work or high volume production. Taking advantage of CNC turning allows manufacturers to increase productivity and consistently output high-quality turned parts. CNC Milling CNC Machining