Which setup method involves using a fixed point to hold a workpart in a lathe?

The method that involves using a fixed point to secure a workpart in a lathe is known as "between centers." This setup entails using two centers: one at the tailstock and another at the headstock. The workpiece is held firmly in place by these centers, allowing for precise rotation and machining along its length.

This method is especially useful for producing cylindrical parts with high accuracy, as it enables the lathe to apply consistent pressure and alignment throughout the machining process. The fixed points provided by the centers not only enhance the stability of the workpiece but also ensure that the lathe can effectively cut or shape the material uniformly.

In contrast, other setup methods include collets, chucks, and face plates. Collets are typically used for smaller or specific shapes but may not provide the same level of support for longer workpieces as the between centers method does. Chucks can hold a variety of shapes but often rely on clamping mechanisms that may introduce some play or misalignment. Face plates are typically used for mounting flat or irregularly shaped workpieces rather than cylindrical parts. Therefore, when looking for a method that secures a workpart at fixed points along its length, the between centers setup is the optimum choice.