Why when I exclude parts from BOM in assembly tree, weight of these parts still counts to overall mass? This is irritating problem in assemblies with lots of subassemblies. In my opinion it should be change.
Welcome to the forum. The weight of the parts still counts to mass because the components are still part of the assembly, and will still show in a drawing view of the assembly. If you don't want them to show in the assembly, or their mass to be counted, then you need to suppress them in the assembly. You could have a seperate configuration in your assembly with them suppressed.
Thank you for your answer. Yes, parts are still in assembly, but exclude from BOM means, that component is using only for shown supporting structure or similar objects. I always made a separate configurations, but in more complicated assembly drawings is pretty annoying and time-consuming. Also suppression isn't fine when you are working in PLM with SmarTeam (suppressed parts aren't downloaded during check-out) and mates are also inactive. I think problem is more complicated than looks like.
It sounds like you should be using Envelope Parts. They don't get included in the BOM and they don't show up in the weight of the assembly. The bad new is that you have to define a part up front as an envelope part. You can't decide after you have already added it to the assembly to change it to an envelope part.
As a work around for this issue you could make a configuration in your sub-component (part or assembly) that you want excluded from the BOM and set the Mass Properties of that sub-component to zero mass. Name the configuration something obvious like "Zero Mass". You'll want to make sure you apply this overridden mass to that particualr configuration only.
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