The operation of finishing a drilled hole to the correct size is known
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Reaming
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Counter-Sinking
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Counter Boring
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Spot Facing
Reaming is the finishing operation performed after drilling to achieve precise hole size and smooth surface finish. A reamer removes a small amount of material to bring the hole to exact dimensions.
To answer this question, you need to understand the different operations involved in finishing a drilled hole. Let's go through each option to understand why it is correct or incorrect:
Option A) Reaming - This option is correct. Reaming is the process of enlarging a drilled hole to the desired size and improving its surface finish. It is typically done using a reamer, which has multiple cutting edges and is rotated in the hole to remove a small amount of material.
Option B) Counter-Sinking - This option is incorrect. Counter-sinking is the process of creating a conical recess at the top of a drilled hole to allow the screw or bolt head to sit flush with the surface. It is not primarily used to enlarge the hole to the correct size.
Option C) Counter Boring - This option is incorrect. Counter-boring is the process of creating a cylindrical recess at the top of a drilled hole to allow the screw or bolt head to sit below the surface. It is not primarily used to enlarge the hole to the correct size.
Option D) Spot Facing - This option is incorrect. Spot facing is the process of creating a flat surface at the top of a drilled hole to provide a proper seating for a washer or nut. It is not primarily used to enlarge the hole to the correct size.
The correct answer is A) Reaming. This option is correct because reaming is the operation of finishing a drilled hole to the correct size.