Composite Tolerances

A composite tolerance specifies two tolerances for the same geometric characteristic of a feature or features that have different datum requirements. One tolerance relates to a pattern of features and the other tolerance to each feature within the pattern. The individual feature tolerance is more restrictive than the pattern tolerance.


In the illustration, where datums A and B intersect is the datum axis, the point from which the position of the pattern is calculated. A composite tolerance could specify both the diameter of the pattern of holes and the diameter of each individual hole.

When you add composite tolerances to a drawing, you create the first line of a feature control frame and then choose the same geometric characteristic symbol for the second line of the feature control frame. AutoCAD extends the geometric symbol compartment over both lines. You can then create a second line of tolerance symbols.

To add composite tolerances

  1. From the Dimension menu, choose Tolerance.
  2. In the Geometric Tolerance dialog box, choose Sym.
  3. In the Symbol dialog box, choose the composite tolerance symbol.
  4. Choose OK.
  5. In the Geometric Tolerance dialog box, create the first and second tolerance symbol lines.
  6. In the Geometric Tolerance dialog box, on the second line of the feature control frame, choose Sym.
  7. In the Symbol dialog box, choose the same geometric characteristic symbol as for the first line.
  8. In the Geometric Tolerance dialog box under Tolerance 1, enter the tolerance value and any modifying symbols.
  9. Choose OK, and then specify the location of the feature control frame in the drawing.

Command line:  TOLERANCE

1 comment so far ↓

#1 özgür on 01.16.12 at 8:59 pm

why do you add the basics in drawing , what is the logic in this action ? because , already you have used the geometrical tolerance in the drawing

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