What is the primary function of a V-Block in machining?

The primary function of a V-Block in machining is to provide a 90-degree V-groove, which is specifically designed for securely holding round stock during machining operations. This V-groove allows the cylindrical workpiece to be stably positioned and aligned, ensuring accuracy when cutting or performing additional machining processes. The design of the V-Block facilitates easy access for tools and helps prevent the round stock from rolling away during machining, thereby increasing safety and precision in the operation.

The ability to hold round stock securely is crucial in applications requiring tight tolerances and consistent results. The other options do not accurately represent the main purpose of a V-Block. For instance, while a V-Block can assist in measuring or checking pieces indirectly, its primary role is not measurement. Similarly, enhancing cutting speed is not a function of the V-block itself. Instead, that aspect pertains to the tools and parameters of the machining process. Holding flat stock in place could be done in various ways, but the unique V-groove design specifically caters to round stock, making it essential for that use in machining environments.