The accuracy of an instrument depends on 5 basic elements (SWIPE)

  1. S- Standard
  2. W- Workpiece
  3. I- Instrument
  4. P= Person
  5. E- Environment


Factor Affecting accuracy of a measuring System 
Factor Affecting accuracy of a measuring System

1. Standard

Normally the measuring instrument is calibrated with a standard are at regular interval. The
standard may be affected by

  • Coefficient of thermal expansion
  • Stability with time
  • Elastic properties
  • Geometric compatibility
  • Position etc

2. Work piece:
The following factors affect the accuracy

  • Cleanliness surface finish etc.
  • Surface defects
  • Hidden geometry
  • Thermal equalization etc

3. Instrument
The inherent characteristics of the instrument which affect the accuracy are

  • Inadequate amplification
  • Scale error
  • Effect of friction backlash hysteresis etc
  • Deformation while handling heavy w/p
  • Calibration error
  • Repeatability and readability

4. Person
The factors responsible for accuracy are

  • Training skill
  • Sense of precision appreciation
  • Ability to select measuring instrument & standard
  • Attitude towards personal accuracy achievement
  • Planning for measurement technique to have minimum just with consistent in precision.

5. Environment
The environmental factor are:

  • Temperature press humidity
  • Clean surrounding and minimum vibration
  • Adequate illumination
  • Temperature equalization between standard w/p and instrument

Higher accuracy can be achieved if all 5 factors are considered and steps are taken to eliminate them.

Sachin Thorat

Sachin is a B-TECH graduate in Mechanical Engineering from a reputed Engineering college. Currently, he is working in the sheet metal industry as a designer. Additionally, he has interested in Product Design, Animation, and Project design. He also likes to write articles related to the mechanical engineering field and tries to motivate other mechanical engineering students by his innovative project ideas, design, models and videos.

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