Lathe operation vocabulary: The process of embossing a diamond-shaped pattern on a cylindrical workpiece surface is known as

Introduction / Context:
Operators often need to improve grip on knobs, handles, and fasteners. Rather than removing material, a forming operation is used on the lathe to create a textured pattern that enhances friction and aesthetics.

Given Data / Assumptions:

• Standard engine lathe operation.
• Use of knurling tool with hardened patterned wheels.
• Workpiece is cylindrical and free to rotate at low speed.

Concept / Approach:
Knurling is a cold-working process that displaces surface material using toothed rollers to produce patterns such as diamond or straight. It is not a cutting operation; it is a forming process that raises ridges on the surface.

Step-by-Step Solution:

Verification / Alternative check:
Compare with other terms: facing squares an end; grooving cuts a recess; counterboring enlarges an existing hole with a flat bottom. None produce a diamond surface pattern.

Why Other Options Are Wrong:

• Counterboring: enlarges and flats a hole entrance.
• Grooving: creates a groove; no surface texturing like a diamond.
• Facing: creates a flat end face; unrelated to patterning.

Common Pitfalls:
Running too high a speed or too little pressure causes double-tracking and irregular patterns. Proper knurl wheel pitch selection relative to diameter is essential.

Final Answer:
Knurling