Which operation performed on the lathe is an inner diameter (ID) operation?

Which operation performed on the lathe is an inner diameter (ID) operation?

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

Answer: (A)

Inner diameter work means removing material from the inside surface of a hole to size and finish it precisely. On a lathe, boring is the process used to shape and finish the bore: a cutting tool works inside the hole as the tool advances along the axis, producing the required internal diameter and a smooth internal surface. Turning, by contrast, works on the outside of the part to create external diameters. Facing creates a flat end surface, and parting cuts the part off from the stock. So the operation that produces an inner diameter is boring.

Inner diameter work means removing material from the inside surface of a hole to size and finish it precisely. On a lathe, boring is the process used to shape and finish the bore: a cutting tool works inside the hole as the tool advances along the axis, producing the required internal diameter and a smooth internal surface. Turning, by contrast, works on the outside of the part to create external diameters. Facing creates a flat end surface, and parting cuts the part off from the stock. So the operation that produces an inner diameter is boring.