Question 658General Subjects - Assistant Engineer

70% to pass

Before boring a blind tapered hole, a good shop practice to follow is to _______________.

Adrill to the large diameter of the taper
Buse a tapered reamer
Cbore a straight hole
Ddrill to the small diameter of the taper
AI Explanation

The correct answer is D) drill to the small diameter of the taper. When boring a blind tapered hole, it is best practice to first drill a hole to the small diameter of the taper. This allows the boring tool to follow the taper without wandering or creating an oversized opening at the large end of the hole. Drilling to the small diameter ensures the taper is properly formed and maintains the desired dimensions. The other options are not recommended. Using a tapered reamer (B) could damage the workpiece, while boring a straight hole (C) would not create the intended tapered shape. Drilling to the large diameter (A) would result in an improperly formed taper.

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Official Resources
46 CFR Machinery & Electrical 46 CFR Engineering USCG National Maritime Center
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