Turning operation identification — grooving on a lathe In lathe work, which description best matches the grooving operation?

Introduction / Context:
Lathe operations include facing, turning, parting, threading, knurling, chamfering, and grooving. Each has a characteristic tool form and purpose. Grooving creates narrow recesses used for snap-ring seats, oil-retaining grooves, or reliefs before threading.

Given Data / Assumptions:

• External grooving on a cylindrical workpiece.
• Use of a form tool with a width equal to groove width.
• Standard engine lathe setup.

Concept / Approach:
Grooving is essentially localized turning confined to a small axial length. The tool plunges radially to a set depth to form a recess of controlled width. This differs from chamfering (bevel), knurling (pattern), or counterboring (internal enlargement).

Step-by-Step Solution:
Select a grooving tool with correct width and nose geometry.Align tool perpendicular to the axis, position at groove location.Feed radially to the specified depth, with light passes as needed.Finish with a dwell or light skim for clean flanks.

Verification / Alternative check:
Drawings will call out groove width, depth, and position tolerances; the lathe operation must meet these dimensions precisely.

Why Other Options Are Wrong:
(a) is chamfering, (b) is knurling, (d) is counterboring or internal enlargement, and none of these describe the narrow recess characteristic of grooving.

Common Pitfalls:
Using an overly wide tool causing chatter; not deburring groove edges; ignoring minimum fillet radius for stress relief.

Final Answer:
Reducing the diameter of a workpiece over a very narrow axial width