Red Seal Machinist Practice Exam 2026 – All-in-One Comprehensive Guide to Exam Success!

Question: 1 / 400

Which component of a CNC machine is responsible for the motion of the cutting tool?

The base

The controller

The spindle

The spindle is the component of a CNC machine that is directly responsible for the motion of the cutting tool. It houses the tool holder and rotates the cutting tool at high speeds, enabling it to perform machining operations such as milling, drilling, or turning. The spindle's rotation and sometimes the axial movement contribute to the cutting action against the workpiece.

While the base provides stability and support for the entire machine, and the controller sends commands to various components to execute machining operations, it is the spindle that provides the actual rotational motion required for cutting. The chuck, on the other hand, grips the tool in place securely but does not provide motion itself; rather, it holds the tool steady while the spindle rotates it. Thus, the spindle's role in generating the necessary motion makes it the correct answer for this question.

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The chuck

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