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Concentricity : GD&T Basics

  • Concentricity  tolerance is used to control the central axis of a cylinder or sphere w.r.t. a datum plane/axis.
  • Datum Plane /Axis is required to control Concentric tolerance.
  • Concentric tolerance is used where high precision is required to control median points on a cylindrical part such as transmission gears where gears need to be concentric with  mounting.
  • Runout or position tolerance is used instead of concentric tolerance as it is very difficult to measure concentric tolerance.
  • Concentricity tolerance makes a 3-Dimensional cylindrical tolerance zone.
  • LMC and MMC is not applicable with concentric tolerance.

 


Representation Of concentric Tolerance 


Concentricity Tolerance Zone

Concentricity tolerance makes a cylindrical tolerance zone around datum axis where all the measured central points of circular feature must lie.


How To Measure Concentric Tolerance

  • Step 1 : Datum axis of part is identified and part is fixed on that datum axis.
  • Step 2 : With the help of CMM machine outer profile of the surface to be controlled is plotted.
  • Step 3: Central points of plotted profile is determined at various cross sections.
  • Step 4: Make sure all central points are lying within given cylindrical tolerance zone.

 


 Related Articles

Straightness

Flatness

Circularity

Cylindricity

Angularity

Perpendicularism

Symmetry

Concentricity

Profile of line Control

Parallelism

MMC

Profile of Surface Control

 

 

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