Which operation would be used to create an internal diameter on a workpiece?

Which operation would be used to create an internal diameter on a workpiece?

• A. Boring
• B. Turning
• C. Facing
• D. Parting

Answer: (A)

Creating an internal diameter relies on removing material from inside a hole to bring the bore to the final size and precision. That process is boring: a boring tool or bar is guided along the axis of the hole to enlarge and finish the internal surface, achieving accurate diameter and smoothness. Turning is mainly for external surfaces or, in some setups, for cutting internal profiles with specialized tools, but traditionally it’s about outside shapes. Facing makes a flat surface at the end of the workpiece, not the bore. Parting cuts the part off from the stock. So for an internal diameter, boring is the correct operation because it directly machines and finishes the inside of a hole.

Creating an internal diameter relies on removing material from inside a hole to bring the bore to the final size and precision. That process is boring: a boring tool or bar is guided along the axis of the hole to enlarge and finish the internal surface, achieving accurate diameter and smoothness.

Turning is mainly for external surfaces or, in some setups, for cutting internal profiles with specialized tools, but traditionally it’s about outside shapes. Facing makes a flat surface at the end of the workpiece, not the bore. Parting cuts the part off from the stock. So for an internal diameter, boring is the correct operation because it directly machines and finishes the inside of a hole.