According to GB/6318-85 standard, material: HT250,working surface scraped or sophisticated research grinding process for the measurement of the work piece straightness and flatness and equipment installation, the use of temperature (20±5).Cast iron straight edge includes type-bridge, type rectangular, type angle and type dedicated for machine tool guideways, the accuracy check of the table, the geometric precision of measurement, the measurement of precision parts, scraped processing technology and so on, is the benchmark of precision measurement.
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