Surface Plates: The Foundation of Precision Inspection

Surface plates provide a flat, stable reference for measurements. Made from granite or cast iron, they are essential for checking flatness, squareness, and parallelism.

During inspection, parts are placed on the plate. Any deviation from flatness is transferred to the part, making the plate's accuracy critical. Grades like AA, A, and B define tolerance levels.

Proper setup ensures accuracy. The plate must be clean, level, and supported on three points to avoid distortion. Temperature control matters because thermal expansion affects readings.

Using a surface plate with height gages, indicators, or angle plates allows precise layout and measurement. A simple test involves dragging a test indicator across the plate to verify consistency.

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