Before starting to tap the drilled hole, what preparatory step should you perform?

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Prepare for the Machinist Apprentice Level One Test. Utilize flashcards and multiple choice questions, complete with hints and explanations, to ensure readiness for your exam!

Multiple Choice

Before starting to tap the drilled hole, what preparatory step should you perform?

Explanation:
The starting contact of the tap is at the rim of the hole, so removing any burr on the hole’s top edge creates a smooth, clean entry. A burr there can catch the tap, cause it to walk or bind, and lead to crooked or damaged threads. By deburring the lip, you ensure the tap starts true and cuts evenly from the first rotation. Deburring the interior helps as well, but it doesn’t address the initial entry as directly as clearing the top edge. Opening the hole larger would ruin the threaded fit, and while cutting oil aids cutting action, lubrication is not the corrective prep for starting threads.

The starting contact of the tap is at the rim of the hole, so removing any burr on the hole’s top edge creates a smooth, clean entry. A burr there can catch the tap, cause it to walk or bind, and lead to crooked or damaged threads. By deburring the lip, you ensure the tap starts true and cuts evenly from the first rotation. Deburring the interior helps as well, but it doesn’t address the initial entry as directly as clearing the top edge. Opening the hole larger would ruin the threaded fit, and while cutting oil aids cutting action, lubrication is not the corrective prep for starting threads.

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