Geometric tolerances Concentricity

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SUMMARY

The discussion focuses on determining appropriate geometric tolerances for concentricity in mechanical assemblies involving two parts connected by a pin. Concentricity is critical when aligning circular features within a single part, ensuring they remain aligned during movement. Common concentricity values range from 0.02mm to 0.05mm, depending on the size and precision of the components. Relevant standards include DIN EN ISO 1101 (2006-2) for geometric tolerances and DIN ISO 286-1 (1990-11) for standardized fits.

PREREQUISITES
  • Understanding of geometric tolerances, specifically concentricity
  • Familiarity with mechanical fits and tolerances, including pin and hole fits
  • Knowledge of relevant standards such as DIN EN ISO 1101 and DIN ISO 286-1
  • Basic principles of mechanical engineering and assembly design
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  • Research the application of DIN EN ISO 1101 (2006-2) in geometric tolerancing
  • Study the implications of different fits as outlined in DIN ISO 286-1 (1990-11)
  • Explore the effects of concentricity tolerances on mechanical performance
  • Investigate measurement techniques for assessing concentricity in assemblies
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Mechanical engineers, quality control professionals, and anyone involved in the design and manufacturing of precision mechanical assemblies will benefit from this discussion.

asteorit
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Hello,

I need help. I do not know what to give values of the geometrical tolerance for Concentricity. They are two parts connected by a pin. Both parts are moving relative to each.

Thanks for any advice.
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More details needed.

Concentricity is usually necessary when you have two circular features in ONE part and you would like them to be concentric for some mechanical reason. If you have two moving parts with one pin, they will move without any problems as long as you give the proper tolerances for the chosen Fit for pin and hole.

E.g. common values for concentricity are 0.02, 0.05mm or inbetweens (no idea in inches), although diferent values are needed for diferent sizes and fine parts. That should mean that if measured the central axis of the two concentric features which sit on the same part do not distance themselves more than half of 0.02-0.05mm at any point (If I remember right).

A usual standard is DIN EN ISO 1101 (2006-2). Google it or get a similar in imperial if neccesary.

IMHO you need the things in DIN ISO 286-1 (1990-11) which are standardized Fits for holes and shafts.
 

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