Form Measurement

About Form Measurement

A form measurement is conducted to determine the overall form/shape of an object under test, which may refer to its flatness, straightness, parallelism, roundness, or cylindricity.

FAQs

• What is form measurement?
  Form measurement assesses an object's shape, geometry, and surface characteristics. This process evaluates straightness, flatness, roundness, cylindricity, and profile. The results determine if the shape meets specified tolerances and quality standards.

• How do you measure out-of-roundness and flatness accurately?
  To measure out-of-roundness, use a roundness tester or a coordinate measuring machine (CMM) with a touch-trigger probe for detailed surface points. To measure flatness, use a dial gauge on a precision surface plate, a surface profiler for detailed topography, or a CMM to record and compare surface points to a flat plane.

• How do you interpret the data from form measurement?
  Interpreting the data involves comparing the measured values to the specified tolerances and standards for the component. The data often visualised through graphs or 3D models, highlights irregularities or deviations from the ideal form. Statistical analysis helps understand patterns and identify causes of discrepancies.

• What instruments are used for form measurement?
  The Mitutoyo Surftest SJ-210 is a profilometer that measures surface roughness, provides sectional calculation results, and evaluates profiles, load variations, and amplitude distribution patterns.