A drill that chips at the cutting edge typically indicates which condition?

A drill that chips at the cutting edge typically indicates which condition?

• A. Too much feed
• B. Too little feed
• C. Sharp point
• D. Dull edge

Answer: (A)

When the drill edge chips, the cutting edge is being overloaded. Pushing more material into the cut than the edge can cleanly shear per revolution increases the cutting forces on the tip. That higher force can fracture the hardest part of the tool, causing the edge to chip off. A proper, moderate feed lets the material be removed smoothly and the edge stay intact. If the feed is too light, you’ll get rubbing and poor chip formation rather than edge damage; a sharp point helps, while a dull edge tends to rub and heat up rather than chip from the load. So, the edge chipping points to too much feed.

When the drill edge chips, the cutting edge is being overloaded. Pushing more material into the cut than the edge can cleanly shear per revolution increases the cutting forces on the tip. That higher force can fracture the hardest part of the tool, causing the edge to chip off. A proper, moderate feed lets the material be removed smoothly and the edge stay intact. If the feed is too light, you’ll get rubbing and poor chip formation rather than edge damage; a sharp point helps, while a dull edge tends to rub and heat up rather than chip from the load. So, the edge chipping points to too much feed.