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Granite Block 18"x24"x4" Free

  • 24 May 2021 6:20 AM
    Reply # 10544362 on 10524141

    Sounds like a machinist's surface plate.

    FYI, from Wikipedia:

    surface plate is a solid, flat plate used as the main horizontal reference plane for precision inspection, marking out (layout), and tooling setup.[1] The surface plate is often used as the baseline for all measurements to a workpiece, therefore one primary surface is finished extremely flat with tolerances below 11.5 μm or 0.0115 mm per 2960 mm for a grade 0 plate.[2] Surface plates are a common tool in the manufacturing industry and are often fitted with mounting points so that it can be an integrated structural element of a machine such as a coordinate-measuring machine, precision optical assembly, or other high precision scientific & industrial machine. Plates are typically square or rectangular, although they may be cut to any shape.


    Last modified: 24 May 2021 8:05 AM | Aaron Endelman
  • 19 May 2021 2:09 PM
    Message # 10524141
    Anonymous

    Perfectly Flat, used for sandpaper sharpening. 


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