NCCER Millwright Practice Exam 2025 – The Comprehensive All-in-One Guide for Exam Success!

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What is a common type of gear used in machinery?

Helical gears

Spur gears

Spur gears are a fundamental type of gear widely used in various machinery due to their straightforward design and efficiency in transmitting power. They have straight teeth that are aligned parallel to the gear axis, which allows for smooth engagement with other spur gears. This design results in minimal friction and noise, making them ideal for applications where speed and reliability are crucial.

Spur gears excel in operations where forces are mainly axial and are commonly found in applications like conveyor systems, automotive transmissions, and various industrial machinery. Their simplicity in construction also reflects in maintenance requirements, further underscoring their ubiquitous use in mechanical systems.

While helical, cone, and planetary gears are also essential in specific applications, spur gears are among the most common and foundational due to their effectiveness and ease of manufacture.

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Cone gears

Planetary gears

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