Metrology Engineering =link=

| Symbol | Control | Measurement method | |--------|---------|--------------------| | ⚪ (⌀) | Diameter | CMM, micrometer | | ⌖ | Position | CMM (requires datum alignment) | | ⫟ | Flatness | Surface plate & height gage / CMM | | ⌭ | Runout (circular/total) | Lathe + dial indicator | | ⏥ | Profile of a surface | CMM or optical scanner vs CAD |

means an unbroken chain of comparisons linking a measurement to a national or international standard (e.g., NIST, PTB, NPL). Calibration is the process of comparing an instrument’s readings against a known standard to determine bias or adjust the instrument. metrology engineering

: The permissible limit or limits of variation in a physical dimension or a measured value of a manufactured object. Primary Branches of Metrology | Symbol | Control | Measurement method |

: Researching new measurement methods and maintaining the highest standards. Primary Branches of Metrology : Researching new measurement