Technical Info

QCSS Policy and General Metrology

Traceability and NIST Report Numbers - Explains the metrology community stance on traceability, as well as why we no longer use NIST Report of Test Numbers.

Plain Ring Calibration Orientation and Tolerances - Shows the orientation that we refer to on your Calibration Report, as well as the types and tolerances.

Toolmakers Tolerance Chart - A reference chart for how most gages are classified for tolerancing.

Gage Block Stacking and Wringing - Shows how to properly prepare, stack, and wring gage blocks for accurate height or length checking.

Gage Ball Chart - A chart for finding the right class of gage ball for you.

Surface Plate Information

Proper Support of Surface Plates - Explains the reasoning for 3 point support of surface plates. Contains an illustrated explanation of the proper positioning of the 3 point support.

Surface Plate Tolerances (Flatness and Repeatability) - Surface plate tolerances for flatness and repeatability as defined by Federal Specification GGG-P-463c(1).