Wrong Volume Calculation

Forum|Forum|1 year ago
November 4, 2024
4 replies
2300 views

Hello,

I am using Creo Parametric 9.0.8.0 with Windows 10. I have an odd case where it appears that Creo is measuring the volume of a part wrong. The volume output from the mass properties dialog box is showing a value of about 0.306 in^3 as shown in one of the screen shots. However, this way underestimates the volume of the part. Just the main portion in the middle can be hand calculated to about 0.7 in^3. I don't know what is wrong here. I have tried regenerating the part and swapping to fully assigned properties and then back to geometry defined, but the number does not change. Any insight is appreciated.

Thanks,

General

Best answer by tbraxton

The calcs look reasonable to me with a cursory check of the geometry. Are you certain your manual estimate of volume is accurate?

Your model is using relative accuracy (not an issue in this context). You should not be creating/using models with relative accuracy in Creo 7+. If you are using legacy start parts you should immediately change them to absolute accuracy.

tbraxton

22-Sapphire II

Post the model for evaluation. There are many things that could cause the results to be unexpected as you show in the screen shots. It is unlikely that Creo is in error here. It is most likely that Creo is reporting what the user has requested.

J

JohnDHage

Author

10-Marble

Hi,

Here is the part file.

Thanks,

1_Orifice,-Plug.zip

kdirth

21-Topaz I

Looks reasonable to me. I also modeled to print with revolve with similar results - 0.336.

My simple calculation:

There is always more to learn.

B

BenLoosli

23-Emerald III

I get a .3385 volume in Creo 9.0.9 without the internal cuts.

tbraxton

Answer

22-Sapphire II

The calcs look reasonable to me with a cursory check of the geometry. Are you certain your manual estimate of volume is accurate?

Your model is using relative accuracy (not an issue in this context). You should not be creating/using models with relative accuracy in Creo 7+. If you are using legacy start parts you should immediately change them to absolute accuracy.