What is the function of plate fixtures in machining?

Plate fixtures serve a crucial role in machining by ensuring that workpieces are held at the correct orientation relative to the machine table. This alignment is essential for achieving precision during the machining process. By holding workpieces parallel or perpendicular, plate fixtures help maintain consistent cutting angles and positions, which is vital for producing high-quality parts with tight tolerances.

Proper alignment reduces the risk of errors, such as misalignment during cuts or drills, which can lead to defects or rework. This accuracy is particularly important in industries where parts need to fit together seamlessly or where strict specifications must be met.

Other options like polishing workpieces, disposing of waste material, and measuring dimensions accurately do not encompass the primary role of plate fixtures. While these activities may be associated with other tools or processes in machining, they do not relate directly to the purpose of holding and stabilizing workpieces during the machining operation.