explain the following drilling machine operations: i. reaming ii. boring

i. Reaming is a drilling machine operation that involves the use of a reamer, which is a type of cutting tool with a cylindrical shape and a series of cutting edges along its length. Reaming is used to enlarge and smooth the surface of a hole that has already been drilled, and it is typically used to achieve a precise size and finish on the hole. Reaming is typically done on a drilling machine, using a reamer that is mounted in a chuck or a collet. The reamer is rotated and advanced into the hole, and the cutting edges remove a small amount of material from the walls of the hole.

ii. Boring is a drilling machine operation that involves the use of a boring bar, which is a long, slender tool with a cutting edge at one end. Boring is used to enlarge or deepen a hole that has already been drilled, and it is typically used to create a precise and smooth finish on the hole. Boring is typically done on a drilling machine, using a boring bar that is mounted in a chuck or a collet. The boring bar is rotated and advanced into the hole, and the cutting edge removes a small amount of material from the walls of the hole. Boring is often used to create accurate and precise holes in large or complex parts, and it is often used in conjunction with other machining operations, such as milling or turning.