| 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 |
The Invisible Backbone of Quality: Why Metrology Engineering Matters metrology engineering
