Definition

Noun: - A precision measuring tool, specifically a gauge, consisting of a scriber (a pointed marking tool) attached to an adjustable stand. Its primary function is to test and mark the accuracy, flatness, or parallelism of plane surfaces by comparing them to a known reference surface.

Usage

• The surface gage is used in metalworking and machining to transfer measurements from a reference surface (like a surface plate) to a workpiece or to check if a surface is truly flat.
• It is a fundamental tool in metrology (the science of measurement) for layout work.

Examples

Advanced Usage

• "To set up a surface gage": Refers to the process of adjusting the scriber's height precisely against a reference standard, such as a height gauge or gauge blocks, before taking measurements.
  • He carefully set up the surface gage using a Jo block to ensure an accurate measurement.

Variants and Related Words

• Surface gauge: An alternative, more common spelling for the same tool.
• Scribing block: Another name for the same instrument, emphasizing its marking function.
• Height gauge / Height gage: A related but more advanced measuring instrument with a graduated scale for direct height measurement, often used for similar purposes.

Synonyms

• Marking gauge (in a broader, less precise context)
• Scribing gauge

Notes

• The term is specific to technical fields like machining, engineering, and toolmaking. It is not used in everyday general English.
• The spelling "gage" is an accepted variant of "gauge" in American English, particularly in technical contexts.

Noun

1. gauge consisting of a scriber mounted on an adjustable stand; used to test the accuracy of plane surfaces