Millwright Level 1 Practice Exam 2025 – All-in-One Guide to Master Your Certification!

Question: 1 / 445

What is the primary function of a shim on a milling machine?

Used for lubrication of components

As packing to support a work piece

The primary function of a shim on a milling machine is to serve as packing to support a work piece. Shims are thin pieces of material that can be inserted between components to fill gaps, provide support, or adjust the alignment of the work piece being machined. They help ensure that the work piece is held securely and precisely in place, which is essential for achieving accurate cuts and maintaining the quality of the machining process.

In milling operations, achieving the correct height and alignment of the work piece is crucial, and shimming allows for customizable adjustments that compensate for any inconsistencies in the setup. By placing shims under the work piece, operators can effectively level it and ensure proper engagement with cutting tools, thereby optimizing the machining operation.

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To adjust the height of the machine table

For securing cutting tools in place

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