Creating a Correlated Deviation   

This task shows you how to create a correlated deviation annotation on an assembly component. This annotation is used in the Tolerance Analysis of Deformable Assembly workbench.
  • A correlated deviation annotation may be created on an assembly component.
  • A correlated deviation annotation represents specified or measured points according to a statistics law.
  • The correlated deviation annotation of an assembly component is contained in its annotation set.
    • For a leaf assembly component or a support, correlated deviation annotations represent the input annotations or initial annotations.
    • For a parent assembly component, correlated deviation annotations represent the output annotations or annotations to be verified.
  • A correlated deviation annotation is already associated with a datum reference frame.
    This datum reference frame must:
    • Be isostatic at least.
    • Be associated with the assembly component where the deviation is created.
Open the document.

  1. Click Correlated Deviation  in the Deviations toolbar.
 

  1. Select the assembly component.
In a CATPart document the Component field is automatically updated with the part number.
 

  1. The Correlated Deviation Definition dialog box appears.
  • In the Statistic Law tab you can select a measurement file to define the correlated deviation law.
    When no measures file in the Statistics Law field is specified, each point of the correlated deviation is created according to a normal law with a mean of 1mm and a standard deviation of 0.1mm.
  • In the Analysis tab you can select and define the desired analysis.
    Two analyses are available:
    • Local, the deviation annotations are take into account where they are defined only.
    • Global, the deviation annotations are interpolated on the part or the product.
 

  1. Select the correlated deviation datum reference frame.

  1. Click OK to create the correlated deviation annotation.