AutoCAD .NET :: Mass Properties Center Point Of Gravity Coming Out Incorrect
Jul 19, 2012
I have tried just about everything and the mass properties center point of gravity is coming out incorrect.
I have created a box 300x300x300 with the center of the box at 0,0,0 (for testing the cg) . The result I get is not 0,0,0 one of the values always comes out to be not zero, depending on the orientation of the box. Is this a bug?
Dim cg As Point3d = T.MassProperties.CentroidMsgBox(cg.X & vbCr & cg.Y & vbCr & cg.Z)
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Oct 21, 2011
How can see visually the center mass of a part or assembly?
When I'm checking in the Iprop., I see the center of gravity coordinates, but it there a way to "see" it (some visual representation)
Inventor 2012 Pro.
I7 workstation
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Mar 29, 2013
I can obtain the Center of Gravity of a sub-assembly. What are the values with respect to? The origin/root of the whole assembly or the origin of the sub-assembly? How can I obtain the coordinate of the COG of a sub-assembly with respect to its origin or with respect to the whole assembly's origin?
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Dec 22, 2012
is it possible in AUTOCAD to know the CENTER OF GRAVITY OF A VEHICLE?
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Jun 11, 2012
How do I get the center of gravity to work, by measuring a distance from the origin like Solidworks? I select the “Physical” Tab under the iProperties “Center of Gravity” and it gives me” lbmass”? Also is there a way for it to show on the screen?
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Sep 22, 2010
I have a LOD in my assembly to suppress some of the components. In the assembly, it looks like the center of gravity is correct for the LOD. Now I place this assembly in an idw with the LOD active. Now I right-click on the assembly in the idw and choose "Center of Gravity". The center of gravity shown here does not represent the center of gravity for this LOD. The CG shown represents the CG of the master LOD.
Is it possible to get the center of gravity to show on the idw that represent the CG of an LOD?
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Apr 11, 2012
Structural shape authoring has a parameter mapping for the center of gravity. What values should these be for a C channel where the part origin is at the geometric center and the center of gravity is located along the negative X axis? I checked one of the channels in content center - it had the origin located at the center of gravity and the parameter mapping was the distance to the outer web surface (positive), with the web located in the negative X direction.
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Oct 29, 2013
I am having a problem with an assembly not showing the correct total mass of all of its components and sub-assemblies. The value is out by nearly 20%, over 3000kg!
I have narrowed the mass discrepancy down to a derived part of a sub-assembly. But this incorrect mass is only present when I navigate to the derived part's iproperites via the browser tree of the higher level assembly where I am having the mass problem. It is as though the top assembly got some of its mass property information from a previous point in time, i.e. possibly before the derived part's mass properties were updated, and now refuses to look at the current information.
By the way, I have opened up and checked the mass properties of each sub-assembly and the derived part; and when opened individually these show as correct. I have also tried 'Rebuild All' with no success.
Is it possible for mass properties in an assembly to become corrupted?
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Mar 22, 2013
For some reason it will not let me constrain a part to the center of gravity plains. I would like to constrain lifting lugs to the center of gravity so the model will automatically update itself. Is there anyway to make this work (using ilogic or anything)?
Why would Inventor tease me with showing me the center of gravity plains in an assembly but making them completely useless?
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Sep 22, 2013
I have created assembly (lets call it main assembly) in which there are 4 other assemblies (lets call them sub assemblies).
Now in the main assembly document i want to display center of gravity of each of the sub assembly.
When i open each of the sub assemblies and turn on center of gravity of each of them, when returning to main assembly view it displays center of gravity of main assembly, not of each of the sub assemblies.
Im asking for this because i want to create a drawing of main assembly and add dimensions of each of the sub assembly centers of gravity and unfortunatly just as in assembly view, when i want to display center of gravity i can do it only for the main assembly not for each of sub assemblies.
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Oct 21, 2011
I am currently trying to show a comparison of Center of Gravity between two assembly's. One is the original state and the other has counter weight bars. I know how to get the COG to show on my drawings, but both COG locations are the same in my drawings (but different in my assembly) My problem is when I create View Representations and I toggle the Counter Weight bars off, the COG in my drawing still remains in the same location as if they were still on. I know the hard way of accomplishing my task would be to save 2 seperate models (one with Counter Weights and one without). But I would like to take full advantage of the Representation Option. Using IV 2012 Pro.
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Dec 20, 2010
How on earth do you show the COG on a drawing in inventor 2011?
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Mar 19, 2012
I am trying to retrieve center of gravity in my assembly, I now already coordinates given by iporoperties, now i want to measure to that specific point, is it possible to do it? or to actually show the center of gravity in the assembly?
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Sep 20, 2013
I have an assembly file in which I have created several levels of detail. My intent was to suppress specific parts in the assembly (for views in the idw and to calculate the weight of the assembly).
I have noticed that the mass is incorrect for the level of detail that I want calculated. I determined this after creating a new assembly and deleting all parts that were not used in this level of detail. And, by viewing all parts individually and adding them up by hand.
All parts in the assembly have the correct density. I have selected to calculate the mass properties of the active level of detail when updating.
My questions: Am I correct in assuming that the assembly will caculate only the parts that are not suppressed? Or, am I thinking of it wrong? Is this particular assembly messed up? I haven't noticed this before and am now concerned that my weights have been incorrect.
My solution to use right now is to create a new assembly just for figuring out the weight. I think there is a better way.
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Aug 27, 2013
I am trying to apply a load lengthwise on a 2 x 2 x 3/16 angle at the center of gravity using "stress analysis" in inventor pro 2014, but it won't let me apply the load at this point. I know that the load would be floating in the air at the center of gravity, could this be the issue?
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Aug 1, 2013
I am trying to pinpoint the center of gravity on a curved face of an assembly. I can use the c og G command to get the true center of gravity but i would like to incorporate lifting eyes into the finished assembly. Basically I need to know how to find the C of G on a given surface. I have attached the assembly I am working on and added lifting eyes roughly where I would like them. I have tried measuring from the C of G to a face and then creating the lug above the C of G but somehow it doesn't line up.
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Apr 29, 2013
Ok received parts from a customer. It was ALL mesh features.I converted some of them(the mesh features) to Solids. Some would not convert to solids (converted to surfaces).
I need to have the COG show up correctly. Yes, I have a physical COG. I know where it is supposed to be.
I am trying to use this and several other parts (with mixed, Solids, Surfaces, Mesh features), in an assembly AND balance it all thru a common lift point.
How can I correct the COG of the individual parts, so that the assembly is correct.
I have work planes for the corrected COGs, but I am afraid that I will need to calculate the new COG for the assebmly.
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Dec 22, 2004
Is there a command within AutoCAD2000 to establish the centre of gravity of a solid or solids?
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Dec 27, 2013
In the iProperties, in the Mass properties are the coordinates of the center of gravity. i guess they relate to the center point and axes in the main origin folder, right?
How can i show and measure from the genter of gravity symbol in parts and drawings?
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May 8, 2012
I'm trying to build a VBA code in inventor 2010 to export the Center of gravity coordinates (X,Y,Z) from an inventor assembly to an excel sheet.
But I'm not able to get the iproperties for the COG from my assembly.
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Apr 8, 2013
I wonder how to convert the centre of gravity of a part into a work point.
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Apr 5, 2013
In Photoshop / Illustrator, when I create a polygon, and rotate it around it's center point it wobbles. When I scribe it inside of a perfect circle, and rotate it around the circle's center point it rotates smoothly. Basically proving that (at least according to these Adobe products) that the center point of a circle is different than the center point of a polygon scribed inside of it.
An image – the dots in the center are the corresponding center points according to Adobe:
[URL].......
This is incorrect according to basic math. Is Adobe aware of this bug?
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Sep 9, 2013
I am wondering is there a command that can let me find the center of mass for a linear object.
In particular I need to find the center of mass for an arc.
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Apr 4, 2012
I am using AutoCAD Map 3D 2009. I am not getting the object data values seen in the properties window in one of my machine. The other machine I am able to get the object data in the properties window.
I have attached screen shot of the machine where the object data can be seen in the properties window.
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May 23, 2012
Why is the design center not coming on screen. When I press the button, the command says adccclose
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Jun 14, 2013
I was performing some FEA analysis and was getting some strange results. So I investigated into my material properties to find that mine were INCORRECT! I looked at some of my co workers material libraries and they seemed to be correct. How do I go about possibly resetting my material properties. I just installed inventor 2014 about a week or 2 ago. I have attached a screen shot of the incorrect material properties.
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Nov 8, 2011
I have recently made a bucket for chain (linked) and was looking to put the chain in the bucket for visual purposes and to see if the capacity of the bucket is correct.
I can get the chain linked together, however when rotated round it passes through another piece of chain.
Is there a way in inventor to tell a part/assembly of it’s physical/mass properties? I know you can make something mild steel and get weight etc, however if not constrained it still passes through as if it’s a ghost.
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Mar 2, 2012
how to determine the mass properties of bolt.
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Jul 9, 2012
I'm having trouble getting mass properties of an assembly to display in an .idw. I've tried it 2 diffent ways, custom properties-model "Totalmass" where I type the mass and physical properties-model "mass" where it's automatic with update.. Nothing shows, not even N/A, but in another idw (different assembly) it works. Both text boxes are saved within a sketch that is part of a template. Both idw's use the same template. If I place text on the drawing it self it works.
IV 2012
Vault Collaboration 2012
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Nov 21, 2013
To get net weight of my parts i have one template that uses the volume x density and to get the gross weight I use the real dimensions of the item (a rectangular plate without any cutting, e.g.) and then calculate x density, this way i can get both weights, and how in the most of times I need the gross, I overwrite the MASS PROPERTIES of each part with my gross weight. It works fine because all the assemblies sum the MASS of each part (that is over writed by the gross weight).
Now my problem:
In many cases when I need to use the same part many times with just a few of different details, instead of copy the part and change it, I use the same part, and in the IAM I use one feature to make this part different (like a chamber, small extrudes or even holes). But now I realized when I do this (feature in the IAM), it doesn't sum all the MASS properties of each individual part anymore ... it recalculate all the mass with the new IAM volume (with all the features)...so, in my BOM I got all the parts with the correct gross weight, but my total mass comes with the NET weight (and considering that I need the GROSS, i got the wrong mass).
Is there a way to change the way that inventor overwrite this mass in the assemblies ? with Ilogic, or even some Inventor's option ?
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Aug 9, 2012
Is there any way to force an update of mass property values of a component from within an iLogic routine?
I am trying to produce a calibration chart showing the volumes of an irregular shaped object by taking incremental slices off the component and accessing the "volume" of the remaining portion, then writing the the results to an external file - All from within a "For - Next" loop.
The main routine works O.K. but the resultant chart only shows the original starting volume for each slice instead of the required reducing volumes.
I am a novice with iLogic and can only assume that I must somehow "update" the mass properties of the sliced object before reading its new volume on each pass.
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