Siehe, dann geht es automatisch
http://www.ptc.com/cs/tpi/8965.htm Description
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For library parts, a mass value is provided by the vendor. When these items are assembled and a mass properties is done for the assembly, can the given mass values be used to calculate the total weight of the assembly?
Resolution
By default Pro/ENGINEER will calculate the mass of an object by multiplying the density and volume of the object. To override this default add two relations to the part:
weight = <the given value>
mp_density = weight / mp_volume("")
This set of equations causes the mass properties calculation to ignore the volume of the object and just use the given weight parameter. Pro/ENGINEER thus calculates the mass by using the equation:
weight
mass = ------ * volume
volume
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Servus
Alois
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