How should you engage the workpiece to avoid chipping the fragile cutting inserts and edges?

• A. Gently
• B. Firmly
• C. Quickly
• D. Slowly

Answer: (A)

Starting with a gentle engagement is essential because brittle cutting inserts crack or chip when they are subjected to a sudden, high load. By easing the tool into the cut with a light depth of cut and a low feed, you create a gradual, controlled contact that keeps cutting forces small and avoids shock on the edge. This also helps minimize heat from rubbing and reduces vibrations, both of which can contribute to edge damage. Use a ramping approach, slowly increasing into the full depth of cut, and ensure proper workholding to prevent chatter. Engaging quickly or firmly creates large instantaneous loads, while a very slow, rubbing entry can overheat and dull the edge; neither is as protective as a gentle, gradual start.