Weight and inertia properties after Union trim

[Pimech]

Hi,
I used a union trim feature in part design. I've two bodies, body.1 and partbody which contains union trim feature using body.1 as trim surface.
After trim union, Body.1 is hidden and I have on partbody the result I want; now I've some doubts about inertia properties. If I measure inertia properties of the whole part, they include properties of hidden part too and then body.1.
Is there a way to not include hidden parts in weight/inertia measurement?

Thanks
Pierluigi

 

[ferdo]

Try to work with separate bodies, do not include them under PartBody, then measure only PartBody (mainbody). I believe this is what you want.

Regards
Fernando

https://picasaweb.google.com/102257836106335725208

https://picasaweb.google.com/103462806772634246699/

 

[Pimech]

Yes I know it, if I measure only partbody I get inertia measurement I want. But if I include the part in a product assembly, the product weight will be influenced by all bodies included in the part. Is there a way to ignore some bodies in inertia measurement?
Thanls

 

[ferdo]

I believe you have to select each Partbody (mainbody) in your product then apply measure inertia.

Regards
Fernando

https://picasaweb.google.com/102257836106335725208

https://picasaweb.google.com/103462806772634246699/

 

[jackk]

Luigi,

I just repeated the steps in your original post whith V5R20, and I believe you are getting the correct results.

Remember, you are joining the two bodies together when you do a UNION TRIM, the measuring the inertia of the PartBody should give you the results of the resulting solid shape.

Measuring the inertia of a Body, will give you results of that Body only.

When you did the UNION TRIM, did you remove or keep some portion of the Body.1 ?

 

[Pimech]

Thanks for reply, jackk.
I know that the measuring the inertia of the partbody give me the result I want, that is the weight of the union trim feature result. But the measuring of the Part will be influenced by all bodies; I'm asking whether it is a way to measure a Product ignoring some bodies in the Part included in the Product.
For now, I can reach this result only as suggested by ferdo or rather selecting each body in my product and then apply inertia measurement. But it is not so friendly if i have a complex product with many parts.

 

[ferdo]

Do it with a macro but for this your rules to create parts and products must be very clear.

Regards
Fernando

https://picasaweb.google.com/102257836106335725208

https://picasaweb.google.com/103462806772634246699/

 

[jackk]

Without having a custom macro to do it, I would deactivate the part instances to be ignored and then measure the inertia of the product.

 

[Pimech]

Thanks, I'll try with deactivate as soon as I'm at home. It may be the clearer solution.