🔍 Key Concepts

• Function of a pilot hole when drilling large diameters • What the dead center (chisel edge) of a twist drill actually does • How pilot holes affect cutting action vs. speed of the main drill bit

💭 Think About

• Ask yourself: What part of a large drill bit has the hardest time starting a cut in solid metal? • Which option describes something a small hole can do for the center of the larger drill bit, not its outer cutting edges? • Which choices sound like real machining practice, and which sound more like guesses about speed or size?

✅ Before You Answer

• Make sure the option you choose relates to the center area of the drill, not just the outer cutting lips. • Eliminate any answers that focus only on speed or "maximum cut" without explaining how a pilot hole physically helps the larger bit. • Confirm that the correct choice involves making it easier for the large drill to start and stay on center.