Millwright Level 1 Practice Exam 2026 - Free Millwright Practice Questions and Study Guide

Question: 1 / 445

What tool is used to cut an O-ring groove?

End mill

Form tool

The use of a form tool is key for cutting an O-ring groove because it is specifically designed to create complex profiles and shapes within a workpiece. Form tools are custom-shaped cutting tools that can achieve the precise geometry needed for the O-ring groove without generating excessive tool wear or requiring multiple passes.

This capability allows for the accurate reproduction of the groove’s cross-sectional shape, which is essential for ensuring a proper seal when the O-ring is installed. The design and shape of the form tool can be tailored to fit the required dimensions of the groove, making it the most suitable option for this type of machining task. In contrast, the other tools mentioned may not be designed for such specific applications, potentially leading to inaccurate grooves or surface finishes that do not meet the required standards.

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Lathe bit

Ball nose cutter

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