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ptc-31392561-Visitor
1-Visitor
September 8, 2010
Question

Mass Properties Computed VS Assigned

I have an assembly that has the weight assigned to some of the library
parts with in it.

If a user forgets to toggle the radio button to "Assigned" it will display
an invalid weight for the assy.

Is there a way when you compute "Mass Properties" to have it to default to
"Assigned" instead of "Computed"

Regards,




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18 replies

dgschaefer21-Topaz II
21-Topaz II
September 8, 2010
Nope. Stupid, eh? If I assign a mass, overriding the built in geometry
based calculations, why would Pro/E think that I wouldn't want to use
it?

If, however, you use relations to drive a parameter (say, "MASS" or
"WEIGHT"), then it will use the assigned value.

A couple of years ago, we had a program where the base assembly weight
had to be under 100lbs. After a lot of work, we proudly announced that
we had hit the target and send the assembly to the customer. He ran a
mass props analysis and pro/E reported that it weighed 400+ lbs! Pro/E
was ignoring the assigned mass on purchased components. Once he checked
the 'assigned' box (I had been checking via a relation driven
parameter), all was well.

Even though it was a Pro/E problem, we had egg on our face and it took
me several non-billable hours to figure out the problem. Not to mention
that the client and several here have never quite trusted Pro/E's mass
props analysis since.

Doug Schaefer
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jnanesh.sajjan1-Visitor
1-Visitor
September 8, 2010
Hi,

Based on my experience with such assemblies:

If an assy contains part/subassy for which user has assigned the mass props, by default the mass analysis will consider "assigned"option. So user is warned to change to "computed" option is he needs so.


- Sending via mobile. Please pardon the brevity and possible typos -

Thanks and regards,

Jnanesha KS

T 91-80-4119 0900 Ext: 233
F 91-80-41190901
M 994 500 4179
Quality Engineering and Software Technologies
No 55 l QuEST Towers l Mahadevpura l Whitefield Main Road
Bangalore l 560048 l www.quest-global.com


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dgschaefer21-Topaz II
21-Topaz II
September 8, 2010
That's the exact opposite of my experience, Pro/E will always default to
'computed' regardless of assigned mass. This is true through WF4 M080.
What version & build of Pro/E are you referring to?

Doug Schaefer
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jnanesh.sajjan1-Visitor
1-Visitor
September 8, 2010
I use WF3 / M200.

Now this makes me guess that there could be some settings (config file?)


- Sending via mobile. Please pardon the brevity and possible typos -

Thanks and regards,

Jnanesha KS

T 91-80-4119 0900 Ext: 233
F 91-80-41190901
M 994 500 4179
Quality Engineering and Software Technologies
No 55 l QuEST Towers l Mahadevpura l Whitefield Main Road
Bangalore l 560048 l www.quest-global.com


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BobSchwerdlin1-Visitor
1-Visitor
September 8, 2010
I "ALWAYS" go back and double check the mass prop. on each component in my assembly (created and purchased). Too many times I have had an expected weight of, let's say, 100 lbs... only to have Pro/E report a weight of 750 lbs. It usually turns out to be a metric or English value that is way out in left field. Easy fix, but time consuming.

Bob
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dgschaefer21-Topaz II
21-Topaz II
September 8, 2010
I've had issues with combining mass based and force based units, which
is nuts too since Pro/E knows what the value for gravity is. Very few
of us are designing things that aren't for Earth. 😄

Once you enter a material density, there;'s no reason that it should be
very difficult at all to get a weight or mass. However, Pro/E has
always made it difficult.

Doug Schaefer
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dgschaefer21-Topaz II
21-Topaz II
September 8, 2010

I just tested with WF3 M200 and it defaulted to 'Computed'.  If there's
a config option for this I'd sure love to know. It'll go straight into
my config.sup.

Doug Schaefer
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jnanesh.sajjan1-Visitor
1-Visitor
September 8, 2010
Yes, this one is tricky. We need to be careful while using items of different units. However, it is good to enable pro_mp_mass and pro_mp_density in model tree column. Here we can directly look at thier individual values. Interesting thing is irrespective units, the top value (main) gives in the units in which we have set the main assy. For instance: i have an assy which is in in-lb units. It contains in-lb parts and fasteners in metric/SI units. When I run mass props check (setup>mass props), proe converts kgs to lbs and add to final mass.


- Sending via mobile. Please pardon the brevity and possible typos -

Thanks and regards,

Jnanesha KS

T 91-80-4119 0900 Ext: 233
F 91-80-41190901
M 994 500 4179
Quality Engineering and Software Technologies
No 55 l QuEST Towers l Mahadevpura l Whitefield Main Road
Bangalore l 560048 l www.quest-global.com


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anagnost1-Visitor
1-Visitor
September 9, 2010
Hello,

we 've been running Pro/E so many years now but we never saw that radio
button ('Assigned'/'Computed'). Could you please tell me where is it
located? Or, is it something from intralink?

Running ProE WF 4.0/M140

Thanks in advance.

Vassilis Anagnostopoulos*
*
SPIDER SA
Industrial Area - Rodotopi
45500 - Ioannina
Greece
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dgschaefer21-Topaz II
21-Topaz II
September 9, 2010
That choice appears in the mass props dialog ONLY if one of the parts in the assembly has an assigned mass value. If you've never assigned mass to a part, you'll never see it.

Doug Schaefer
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