Drill and method for manufacturing machined product

A drill, comprising:

• a body extended along a rotation axis from a first end to a second end,
• the body comprising
• an outer peripheral surface,
• a cutting edge located on a side of the first end,
• a flank surface located along the cutting edge on a rear side in a rotation direction of the rotation axis, and
• a flute extended from the cutting edge toward the second end,
• the cutting edge comprising
• a first cutting edge,
• a second cutting edge extended from the first cutting edge toward the outer peripheral surface, and
• a third cutting edge extended from the second cutting edge toward the outer peripheral surface,
• the flank surface comprising
• a first flank surface which is located along the first cutting edge and has a first clearance angle,
• a second flank surface which is located along the second cutting edge and has a second clearance angle, and
• a third flank surface which is located along the third cutting edge and has a third clearance angle,
• the second clearance angle being smaller than each of the first clearance angle and the third clearance angle, and
• the first clearance angle is larger than the third clearance angle.

A drill, comprising:

• a body extended along a rotation axis from a first end to a second end,
• the body comprising
• an outer peripheral surface,
• a cutting edge located on a side of the first end,
• a flank surface located along the cutting edge on a rear side in a rotation direction of the rotation axis, and
• a flute extended from the cutting edge toward the second end,
• the cutting edge comprising
• a first cutting edge,
• a second cutting edge extended from the first cutting edge toward the outer peripheral surface, and
• a third cutting edge extended from the second cutting edge toward the outer peripheral surface,
• the flank surface comprising
• a first flank surface which is located along the first cutting edge and has a first clearance angle,
• a second flank surface which is located along the second cutting edge and has a second clearance angle, and
• a third flank surface which is located along the third cutting edge and has a third clearance angle,
• the second clearance angle being smaller than each of the first clearance angle and the third clearance angle, and
• the first flank surface is flat, and the second flank surface and the third flank surface are curved.