About Error Margin and Weight Maturity

Error margin and weight maturity provide information which help evaluate the validity of a weight value.

This page discusses:

Error Margin

When declaring the weight of a part, you have the option of defining the error margin applicable to the declared weight. Also, when computing the weight of a part, the error margin defined in the settings is taken into account. As a result, when computing the global weight of the assembly, the error margin applied to each part is then taken into account to compute the global error margin.

The following formula is used for the computation, where f is a function which depends on independent variables xi (where xi represents the parts):

Example

In an assembly containing:

  • two instances of the part x1, where the part has an error margin of 3g,
  • and one instance of the part x2, where the part has an error margin of 10g,

the terms of the formula are:

Then, the formula becomes:

Which gives the following result:

Weight Maturity

When computing the weight of an assembly, or when performing weight synthesis, an estimation of weight maturity is provided. The higher the percentage of weight maturity, the more you can trust your global weight result. The aim of weight synthesis is to achieve 100% weight maturity.

To put it simply, on an assembly, weight maturity is the addition of the weight maturity percentage assigned to each part, divided by the number of parts.

The table below shows the weight maturity assigned to parts according to the situation:

If the part has...Then the weight maturity of the part is set to...
Declared weight 100%
Computed weight with associated material(s)100%
Computed weight without an associated material50%
No weight0%