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How to get the negative of a cavity?

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ptc-4779394
Level 1
‎10-09-2012 09:13 AM
‎10-09-2012 09:13 AM
How to get the negative of a cavity?

Hello everybody,

i'm a begginer in the use of CREO, so i would be grateful if you could help me step by step. I have a 3D model with a cavity; this cavity has a curved base surface very variable. In the cavity there are also some internal features at different heights . I have to get the negative of this cavity in order to calculate the volume.

Thanks

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BrianMartin
Level 14
‎10-09-2012 11:49 AM
‎10-09-2012 11:49 AM
Re: How to get the negative of a cavity?

Hi Alberto...

I was able to generate the cavity using a couple of different techniques. Neither is really easy to communicate in this format. One method is better if you intend to keep this "core" and update it as your cavity updates. Another is better just for a quick measurement after which you'd discard it.

Sample model used for this procedure (cavity model). The procedure is shown in WF5 but is adaptable to Creo, too:

I'll try to describe the process and let you ask questions rather than try to document the steps here. Starting with your original model (I'll call it the "cavity" model):

Next, I selected the surface on the other end... and the merged surface from the previous step...

Finally, I merged in the last surface (the complex bottom piece).

I hope that gives you enough to get you headed in the right direction. There are other ways to do this (assembly cutout) but I like this way better. I'm sure someone else might come up with an alternative but this is how I would approach the problem.

Thanks!

-Brian

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