DEF_DENSITY no longer works in Creo 8

[Mat]

Hi there,

My company updated to Creo 8.0.1.0 some weeks ago. Now it turns out, that the model check test "DEF_DENSITY" does not work anymore in Creo 8.

In Creo 8 every part gets the default material "PTC_SYSTEM_MTRL_PROPS", which has the density of 1.0.

The test DEF_DENSITY should check, if the density is 1.0, but the test passes.

Since we use modelcheck as a gatekeeper for our windchill, there is a pretty chance, that the pdm-system gets filled up with neutron-star-like parts.

Does someone knows a workaround?

[VladimirN]

From "Creo Parametric 8.0.2.0 Help Center": https://support.ptc.com/help/creo/creo_pma/r8.0/usascii/#page/model_analysis/modelcheck/checks/def_density.html

[Mat · Accepted solution]

ok, I think I found a workaround.

In "checks.mch" I added this line:

PRT_DENSITY          YNEW       E       E       E       E       E 

In "constant.mcn" I added the some boundaries for the density:

DENSITY_LOW 0.000001
DENSITY_UPP 0.9

Looks promising for now.

[VladimirN]

I'm glad you solved your problem.

[KenFarley]

I guess the tricky part would be if someone has a model that is metric...I wonder if modelcheck will take that into account when applying your criteria? We don't use ModelCheck, so I'm just curious.

[Mat]

works absolutely fine with metric parts. We use kg/mm^3 as a density unit.

I guess, if You use e.g. tons/feet^3, You have to adjust the low/upp-values.

[llie]

This is working for us as well in Creo 7.0.4.0. Is there a ModelCheck setting to flag PTC_SYSTEM_MTRL_PROPS material?

[Mat]

Yes, You can change settings for PTC_SYSTEM_MTRL_PROPS.

https://www.ptc.com/en/support/article/CS326615

But I recommend to keep the default values. Thereby You are forced to assign a correct and real material to the part.

[Mat]

Update:

one of my engineers had problems passing this modelcheck test.

It turned out, that his part was made of a foamed material. So the lower boundary of the density was still to high.

Had to alter the limits to

DENSITY_LOW 0.0000000001
DENSITY_UPP 0.9

[DP_10479309]

Hi Mat,

I was looking around for a ModelCHECK setting that flags this as well and just stumbled upon this article today: Article - CS378862 - ModelCHECK check DEF_DENSITY is unable to report error/warning in legacy parts with assigned density as 1.0000 (default) and no material. (ptc.com)

I figured I'd post here as well in case other people are searching around for the same thing.