Boring and turning are common machining processes you use to shape your workpiece to match your design. In both instances, you utilize a single-point turning tool, making the operations less complicated and straightforward.
What is Turning?
The turning process allows you to shape a rotating workpiece into a cone or cylinder. Typically performed on a lathe, it allows you to extract material from the workpiece’s external surface using a single-point turning tool. The movement of the turning tool is usually in a linear path relative to the rotation axis. As such, it could be parallel or at an angle.
What is Boring?
Boring is a finishing machining process you use in enhancing the appearance of your hole formations i.e. dimensional requirements and surface quality. Using a single-point turning tool, you can enlarge holes or apply a desired finish. Depending on your setup, you can either have a rotating tool or workpiece utilizing a lathe or milling machine.
Differences Between Turning and Boring
· Process
While the turning tool in turning is usually stationary, it is either stationary or rotating in boring processes depending on machine setup. For the workpiece, you find it rotated in the turning process, while boring setups can have it rotating or stationary. Furthermore, boring process unlike turning is a secondary finishing process you perform on a cored or drilled hole.
· Features of Parts You Can Machine
You use the turning process to create features on the external surfaces of a workpiece such as axles, shafts, rods and pins. These include cylindrical shapes, external threads, tapers, cones, grooves, shoulders, contours and steps.
Contrarily, the boring process allows you to improve a part’s internal features such as in gearbox casings, engine cylinders and valve bodies. These include enlarging holes, making precision bores, contours, grooves, tapers and recesses.
· Tooling and Techniques
Both turning and boring processes utilize a single-point turning tool typically fashioned from carbide or high-speed steel material. However, in the turning process, you use techniques like straight turning, taper turning, parting, thread turning and grooving. Meanwhile, in boring, you utilize techniques like line boring, rough, jig and fine boring.
· Applications
The turning process allows you to transform the external profile of parts capable of rotation. These include threaded components, bushings, rollers, spindles, shafts, pins and axles. Alternatively, a boring process allows you to enhance the internal profile of hollowed parts. These include valves, engine cylinders, pumps, gearboxes, bearing housings, pump casings, valve bodies, die and mold cavities.
· Advantages
Turning offers you several advantages, including a wide range of external profiles, good finish and dimensional accuracy. It is also suitable for varied materials including metals and plastics. On the other hand, boring offers you exceptional accuracy and precision for internal hole parameters like alignment and outstanding surface finish.
· Limitations
You can only use turning process for external surfaces and not internal parts and are limited to the lathe capability. Conversely, boring is only ideal for internal features like drilled holes with a slower rate of material removal.
When to Choose Boring or Turning Machining
You cannot use boring and turning processes interchangeably; Therefore, you need to determine which process is appropriate for your application. Your choice is typically dependent on functional requirements and part geometry.
You choose the turning process when you need to shape the external surfaces of parts like pins, axles and shafts. Contrarily, boring is the ideal process when you want to modify internal features of an already existing hole formation.
Conclusion
Boring and turning are complementary processes that can allow you to meet a design need. For instance, you can turn a shaft and thereafter fit it into a bored housing.
FAQs
Is turning the same as boring?
No. Turning involves material removal from a part’s external surface, whereas boring involves modifying the features of an internal hole surface.
What are the different types of boring in machining?
- Horizontal boring: Performed horizontal boring on large parts.
- Jig boring: Applies fine tolerances for sensitive components.
- Line boring: Implements boring to high precision levels across multiple holes in alignment.
- Vertical boring: Ideal for components with large diameters.
What are the different types of turning on a lathe?
- Facing: Flattens a part end by removing material.
- Grooving: Creates recesses or narrow slots on the external surface.
- Profiling: Allows formation of curved shapes.
- Straight Turning: Helps form a cylindrical surface.
- Taper Turning: Transforms parts into a cone shape.
- Thread Turning: Creates screw threads on external surfaces.
