What Are The Positioning Benchmark For CNC Precision Parts?

DALIAN, China - Aug. 27, 2023 - PRLog -- In the manufacturing process of precision parts, the positioning benchmark is a critical element to ensure dimensional and shape accuracy. The positioning benchmarks can be classified into rough and fine benchmarks, each with its own characteristics and applications.

This article will delve into the definitions, features, and applications of these two positioning benchmarks in part manufacturing.

Rough Benchmark:

The rough benchmark refers to using the unprocessed surface or base surface of the blank as the reference for positioning the part. The blank is the original workpiece that has not undergone any precision machining and usually has a certain machining allowance and surface roughness. The rough benchmark is commonly used in the rough machining stage to roughly position the part and provide an initial reference for subsequent precision machining.

The advantage of using the rough benchmark is that it simplifies the manufacturing process, reducing the need for complex measurements and calibration steps. As the rough benchmark relies on the original state of the blank, it does not require extensive precision machining and measurement, thereby reducing manufacturing costs and time.

However, the limitation of the rough benchmark is that it cannot provide sufficient accuracy and stability, especially in the manufacturing of high-precision parts. Surface roughness and shape errors on the blank will transfer to the final machined surface, limiting the part's precision.
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