Out of roundness for least square circle - Metrology & Quality Control

Discussion

• Sravanthi   -Posted on 23 Oct 15
  Out of roundness is defined as the greatest distance from a circle to an imperfectly or unbalanced profile.
  
  
  
  
  
  - The different sources of out of roundness of machined parts are:
  
  1) Clamping distortion
  2) Spindle runout
  3) Poor machine condition
  4) vibrations, etc
  
  Least square circle: This circle represents average of all peaks and valleys. It is defined as the sum of squares of large equally spaced ordinates from a circle to the profile having minimum value.
  
  Out of roundness (δ) = δ_p + δ_r
  
  here,
  δ_p = distance of maximum peak
  
  δ_r = distance of maximum valley
  

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