AutoCAD Inventor :: Area Moment Of Inertia Round Off Error
Oct 15, 2012
I have a problem with Inventor pro 2013 rounding of the area moment of inertia to zero (region properties). For example if I create a new sketch and draw a 1 mm x 0.5 mm rectangle and measure the area moment of inertia it will be 0 for one of the pricipal axes. If I change the rectangle to 1 mm x 0.6 mm it doesn't round it off. Seems like there's a problem with the precision in the calculations somehow.
I have tried to change the document units to microns but the same thing happens.
is there a way to make inventor do this calculation correctly?
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Jul 10, 2012
How the mass moment of inertia (kgcm2) is calculated in inventor?
It says it is calculated using negative integral, however i dont find this very informative.
I used the data for a report, and need to justify how i got the center of gravity and inertia properties.
A formula, method or algorithm would be nice.
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Jul 22, 2010
I am trying to determine the moment of inertia of an L-section using IV 2009. By selecting Tools>Region Properties of a closed loop profile in the sketch environment the moment of inertia is given, however the principal axes through the centroid are at 45 degrees to the toe of the angle (see attached image). I want Ixx and Iyy where the X and Y axes are parallel to the horizontal and vertical toe respectively.
Coincidentally, AutoCAD orientates the principal axes the same when viewing the Region Mass Properties of a similar Region.
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May 23, 2013
I created the gear (helical) in the attached file using the standard gear tool in inventor. The problem is how do i then find the mass moment of inertia of it using Inventor?
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Dec 12, 2011
I would like to get the moment of inertia of a deck slab of a bridge on the hatched areas. How can i do it?
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Jan 6, 2012
How do I calculate the moment of inertia for a hollow section? Do I need to use Lisp?
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May 8, 2013
I have a closed polyline that i can add the area to via a field in mtext using the options under area. I would like the area to always be rounded down to the nearest square meter. Is the a way to do this via the acfields.fdc file?
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Jun 28, 2012
I am working on a project for an electricity and magnetism class that deals with using neodymium magnets to propel other neodymium in around a ring. Any method of both importing neodymium or any other rare earth magnetic material into Autodesk Inventor 2013 and then running a dynamic simulation on an assembly consisting of those parts.
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May 8, 2012
I'd like to know how inventor defines the center of rotation when you apply moment load on multiple faces at once. I'm not basically able to define where exactly I need that axis to be. and I dont understand where inventor assumes that axis is. if you take a look at attached model, obviously the resultant forces caused by the applied moment are bigger on the single pillar located on the extention, thats why its been displaced more than the others, but where exactly is center of rotation. I'm trying to avoid modeling of the section above this which technically transfers the moment thorough shear pins on the structure I have modeled.
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Feb 1, 2006
Is there a way to export properties such as Moment of inertial to Partlist or use it as a customer property?
IV10 Pro. SP2
Window XP Pro sp2
Pentium 3.2 Ghz, 3.0 GB of RAM
NVIDIA FX 3400 7.1.8.4
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Sep 5, 2013
I have two sections both region-ed. What is the correct way to find the combined inertia. The sections kind of "fit" into each other. So far I have used two different methods and I don't know which is correct.
1. Centre each section individually, find the section properties of each sections and then add them together.
2. Combine the section, centre them together, and then find the inertia of the combined sections.
So which one is correct? The first one gives a much smaller I value then the second ones.
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Dec 4, 2012
I have a 3D polyline (blue in attached) for which I am trying to calculate the surface area. I use the area-->object command and get 1912342m2 in AutoCAD 2012. My colleague uses the same command in AutoCAD LT 2009 and gets 1807093m2. Due to the discrepancy, I roughly traced a polyline (yellow in attached) around the area in AutoCAD 2012 and I get approx. 1810000m2 so assumedly the AutoCAD LT 2009 version is giving the correct answer while my AutoCAD 2012 is not!
Why am I getting a different area for the polylines...is the difference is due to it being a 3D polyline? Is there a way I can ensure I obtain the correct area using the 3D polyline?
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Nov 25, 2011
I tried unsuccessfully to create a lip around a curve surface and there is no flat plane to select for the sketch. Wonder if this could be done in Inventor. My version is 2011.
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Sep 20, 2011
how to round a parameter using ilogic.
For example. I have Roperev=Roperev_1. Roperev_1 is determined by an excel equation. I need Roperev to produce a nominal number because this parameter dries a coil revolution and I need the revolution to be a whole number.
I can not just round the excel result because the excel result needs to be multiplied by 2.53 to get the resultant for Roperev_1
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May 14, 2013
Right now I am trying to model a concrete embed plate. The design calls for 1/2" round steel embeds at the contour of the line in the attached image. What is the best way to extrude this line into a 1/2" DIA dowel? I have tried the revolve command and sweep command without any luck... I know the sweep command would probably work the best but I can't seem to draw a 1/2" dia circle perpendicular to the line.
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Oct 25, 2011
I need to add a hatch fill polyline area but leave the text island out. What I did is put put Polyline ID and Text island ID into an ObjectIDCollection. The code doesn't throw any error but I can't see the hatch.
Public Function AutoCADAddHatch(ByRef newAddedHatch As Hatch, ByRef HatchElementIDs As ObjectIdCollection, ByVal HatchColour As Autodesk.AutoCAD.Colors.Color,
_ ByVal HatchLayerName As String, Optional ByVal PatternName As String = "SOLID", Optional ByRef strError As String = "") As Boolean
Dim db As Database = acApp.DocumentManager.MdiActiveDocument.Database
[Code] ......
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Sep 19, 2012
I ran into a problem with my dimensions. Everything worked just fine until suddenly, in model tab, every new dimension i wanted to draw, looked like this (see .jpg attatchment). I didnt modify anything. Just changed to layout tab for a moment and then back to model. When i changed the text height into 10x bigger just to see the difference, the white dimension line just got wider and thats it.
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Apr 10, 2011
I have gotten to a point where I have the round text,, I have a seal with a blank space.. I would like to put the round text into the blank space,, but when I try, and no matter how I try,, the text is a white square with round text on it when I try to place it in the circle.
The other thought that came to me,, what if ..(the text circle size was a guess) the text does not fit.. how do I expand or collape it? I know I have in the pass while playing with round text.. gone back to that effect and changed angles, start points etc.. is that the only way?
I have attached what I have so far. ( I tried to attach the Paint.net file but I guess you can't, so these are the two I am working on,, as layers in Paint.net)
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Jan 25, 2013
I have two cylinders that are at a right angle to each other and was wondering how to create a fin to "wrap" around the round edge and then intersect with the flat side of the other cylinder.
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Aug 7, 2012
Is there some super secret option for making fractions in the drawing environment round up to the nearest, for example, 1/16th? There has to be, there just has to be.
IV2012
Windows XP SP3 32-bit
Intel Core 2 Duo 6400 @ 2.13 GHz
Nvidia Quadro FX 3450/4000 SDI 256MB Vram
2 GB Ram
160GB HDD
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Apr 14, 2012
I have a square to round transition that I need formed up and the shop is telling me that they would prefer to split this thing at the corners rather than the flats. I've tried two different ways of doing this but how to handle this part. It's 10.75" OD at the bottom and 2'-4" square at the top and 1'3" in length and made of 1/4" stainless steel plate. The shop wants this in four bent pieces that they can weld together down the corners.
I've tried making just the one side but I'm not getting the results I would like to see. Making the full transition (as in the picture above) gives the finished result I am looking for but I can't separate it into multiple sides.
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Nov 20, 2013
I've attached the file (Inventor 2013). The sketch shown is a raised lip I'd like to have around a future opening. I actually want that sketch to wrap all the way around the body, but taper down to 0 in the rear as there are to be hinge plates. This is going to be a grill/smoker and there needs to be a 3/8" raised lip at the future seam of the top and bottom. Shown in the model is just the top portion.
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Jan 10, 2011
I know you can obviously set the tolerance in the styles to round to the nearest 1/16 or 1/32, but is there a way to make it always round a dimension up instead of to the nearest? IV2012
Windows XP SP3 32-bit
Intel Core 2 Duo 6400 @ 2.13 GHz
Nvidia Quadro FX 3450/4000 SDI 256MB Vram
2 GB Ram
160GB HDD
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Oct 1, 2012
When creating positional reps in Inventor 2012 SP1 it rounds them to a 3 place decimal. So If I want the constraint to be at 1.1875 it rounds it to 1.188. Is there anyway to change this to 4 place decimal?
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Nov 11, 2013
I have been trying to fold a round plate which has 10 milimeters thickness.Is there any way to fold this or unfold ?
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Mar 6, 2013
I have couple of problems that I haven't managed yet on my own.
1. How I can get "smooth" bends without those "steps"? See part: Smooth Bend
2. How I can round that Flange's "inside" corner? Just smooth Corner Round like those other corners have. See part: Corner Round
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Nov 21, 2013
This repeats around 100 times in the command line when adding view port to a sheet. "ERROR: Could not generate sash area from window section profile. I'm using ACA 2013 on windows7 64bit. I've tried purging and audit but still happens. It wouldn't bother me except its taking for ever to wait for them to stop running in command line.
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Nov 20, 2013
This repeats around 100 times in the command line when adding view port to a sheet. "ERROR: Could not generate sash area from window section profile. I'm using ACA 2013 on windows7 64bit. I've tried purging and audit but still happens. It wouldn't bother me except its taking for ever to wait for them to stop running in command line.
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Mar 22, 2013
I have a solid bar which has a diameter equal to the nternal dimensions of a SHS. I am trying to create a weld, basically to fill the gap with a weld. I tried a similar arrangement with a Circular Hollow Section and it worked perfectly. I have tried fillet and groove for the SHS but it will not accept it.
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Oct 13, 2011
I have noticed quite a performance hit when coding the same thing in .NEt compared to VBA. I suspect this to be due to out of process calls between .net and Inventor.
Is there any way to bundle many calls and send them as one.
Example: I want to change the parameter value of a constraint and then update the assemblydocument. Can this be bundled into one call to Inventor?
Inventor Professional 2012 SP1 (25 seats with subscription)
Windows 7 64 bit
Lenovo D20, 12 GB RAM, Intel Xeon X5687 3.6 GHz, SSD
Quadro 4000, driver 8.17.12.9573, dual monitors
SpacePilot, driver version 6.15.3 Firmware 3.12
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Dec 23, 2011
please see attached....how do i pattern holes all round the ball feature?
INV2012
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