AutoCad 2D :: Finding Inertia Of Two Sections?
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 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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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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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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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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Nov 19, 2013
Try to move an object and it does not stay fixed to the move tool cursor, but instead it accelerates off in the direction I initially tried to move it..... but in a sliding inertia type multiplied movement. Have I selected a different mode for the move tool by mistake?
I've checked the pivot point of the object I was trying to move and it was located centrally, nothing strange there.
Also, after the object has wizzed off the screen, pressing undo or [ctrl+z] won't bring it back to it's original location. The undo option is greyed out in the edit menu, suggesting that nothing has been saved in maxs undo history.
System information: Win7 x64 / 3DSMax Design 2014 SP3 / AutoCad 2014 SP1 Lenovo E30 ThinkStation Xeon E31225 Quadcore @3.10Ghz PNY GTX760 XLR8 2GB (334.89 Driver) 24Gb Ram Corsair 650w PSU
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Apr 21, 2013
Following a hardware change, photoshop automatically re-enabled a feature I had deactivated, the OpenGL acceleration.
I gave up on it 18 months ago because of one thing that incredibly irritated me, the crazy "inertia" when we moved elements.
Let's say you have an open document. The image is too large for your photoshop window, you only see a part of it.
So, you keep the Space key held, and you drag and drop with your left mouse click.
Without openGL acceleration : the moving ends as soon as you release your mouse.
With openGL acceleration : the moving gradually slows down until it comes to an end, meaning you have zero control over your work window.
And, well, that's enough of a bother for me to give up on OpenGL acceleration.
Any way to get rid of this feature ? I searched everywhere I could, I think I tried every one of photoshop's options, but to no avail.
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Mar 27, 2013
As part of the automation requirements we are working on (through the .NET interface), we would like to find out whether a given drawing contains a sphere and if it does we would like to know its properties. We are doing something like this, to loop through the database and am able to get all Solid3d type of objects.
What I would like to know, if a given solid3d object is a sphere or otherwise. The code snippet is pasted here for reference:
bool bContainsSphere = false;
foreach (ObjectId Id in Ids)
{
DBObject oObject = ts.GetObject(Id, OpenMode.ForRead);
if (oObject.GetType().Name == "Solid3d")
[Code] ......
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Oct 16, 2011
I am trying to find the ploylines in my autocad modelspace. It does not matter what layer they are on, I just need to find all of them as to find their coordinates. I can find the coordinates of a recently created polyline with the vba help but now I'm stuck with just finding a polyline in the modelspace.
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Sep 25, 2013
I have a task of finding the lines which are overlapping on each other (not completely). One Plines start or End point will be on another lines(without snapping). Need to find all those such lines..
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Sep 12, 2012
I am looking for a 2D to 3D tool for inventor. According to some posts there is a tool at Autodesk Labs but this appears to have been discontinued.
Are there any tutorials / videos of how to achieve this goal now?
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Oct 23, 2011
finding a good visualisation package? I'm looking for something simple but with good effects. I'm only working to 2D. I currently use M-Color but would like something that would give a better result but is as easy to use.
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Aug 9, 2013
trying to find a .net DWG viewer component that actually works. I tried DWG Viewer from SkySoft and cannot get it to register in VS 2010, I downloaded and installed SolidWorks eDrawings viewer and tried to use that. I could not get that to register and place the control on the toolbox. I also tried TrueView and I'm beginning to thing it can't be done. It seems like this should be fairly easy but it's not.
All I want is to be able to display the .dwg drawing on a Windows form. I have a .net WinForms app that I would like to show the drawing to the user. I already have the bitmap preview and would like something larger.
I am using Visual Studio 2010 on a Win 7 64bit machine.
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May 2, 2013
Is there a way to find out if the drawing was in a scale other than 1:1 when it was originally drawn?
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Apr 15, 2011
I am attempting to plot a site plan for a large single family home property (2 lots at 200'x329') to an ARCH D (24x36) sheet and have set up the paper space and a title block template to fit this. I set up a new viewport inside the tile block template to take up all the open space inside it.
Our professor provided us the survey from which we're doing our drawings and has asked for us to plot in 1:20 scale(1"=20'), so I have input 1:240 (1" = 240") in the layout scale menu. The site plan to be plotted fits, but much too small to be acceptable. It takes up only maybe a third of the viewport, when it should fill the viewport (the sheet) for the most part.
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Aug 12, 2013
I am currently working in Autodesktop 2006 at the moment and have somehow misplaced my Express Tools "Layers" toolbar. I don't remember touching it, but it's now gone. I've toggled it on and off with no luck.
Edit:
Never mind. I just reset the profile and dealt with it that way.
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May 20, 2012
I have a 3d topographic survey plan. I need to take sections at various locations and would like to know the best way of going about this.
I am used to working with solids and so would normally just take a section plane but this won't work as the 3d topographic survey plan I have is made up of polylines.
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May 27, 2013
I'm using "horizontal section" to make plan drawings of 3D circular columns in an xref-ed drawing. In the x-ref the columns exist as 3D solids made from extruded circles.
Regardless of my VIEWRES setting, the resulting 2D circle discretion is way too coarse and is presented as a polygon on my drawings.
The same applies to solids made in the same drawing, by the way, so I don't think the xref-ing has anything to do with it. Is there a to adjust this for sections?
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Jun 2, 2009
i xref a floor plan in which one of the sections has hidden lines. In the file with the XREF in it, the hidden lines are not showing.
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Feb 17, 2011
Best way to divide a DWG file into sections? I`m trying to building a data base for construction work to build houses on a city, and the database call for a map that came from a gps device, that is on DWG format. now this image is full of squares that represent the new house locations, the problem is that is one whole image representing the whole city, I was wondering if there is a way to divide this image into sectors to represent the houses location when i do a printout.
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Apr 24, 2013
We're using Inventor to model complex bridge structures. We take sections, plans, elevations etc. from the model to AutoCAD.dwg format. We then open the .dwg and insert the view blocks in model space, these files are then used as xrefs in AutoCAD, long winded but a supply chain requirement.
The models and xrefs are all saved on our network, no vault used, no windows syncing.
To create the sections we have a separate part file that contains sketches where we want the sections taken, this is placed in our assembly. The sketches are all straight lines (no cranks) and included in the .dwg and selected to create the sections.
We're experiencing a significant number of files that when we open to update the model views we randomly get an error "valid section line not found" and several of the sections disappear. The section lines part file is fine, the section lines are all still there and unchanged.
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Nov 26, 2011
Im trying to slice a surface into sections. Im not much of a surface modeller, never really tried. For example the surface is a cylindrical shaped piece. Multiple faces, and pieces. When i slice through it, it slices some prices and others it fails to slice. Confusing. I would upload the piece but i cant due to contract restrictions. But is there any methods of slicing or tips that are a common practice when working with surfaces?
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Mar 1, 2012
i have drawn a 3d pyramid 65 radius and 25 high, drawn a 30x30x15 block in the centre and where it breaks through the pyramid i wish to remove it... is there a subtraction/trim option to allow this?
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Jan 7, 2014
Is there a way to identify what sketch or Solid a reference parameter (d0, d1, d2 etc) is in / on.
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Aug 27, 2012
I am trying to set up a search folder in Vault that would find files checked out by all the users.
In my Tools---Find I would set the Property for Checked Out By, Condition to contains. Now, what to enter in the Value window so it searches all the users, the thing is I dont want to enter all the user id's, there are quite few of them.
it here instead of Vault's message board but Vault's one seems to be rather inactive.
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Jun 1, 2012
I want to know is a point(for example p1) is on the right of an alignment?
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Apr 30, 2013
I just installed the student version of ACA 2011, but it does not show any ribbon and I could not even set up the classic look either.
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Feb 5, 2012
now i know this is possible because i did it once before with 2012 but now i can't remember
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Nov 29, 2013
I have made a 3D model of a frame for my work; when I try to add in the dimensions I cannot find the dimension between for example one horizontal line (in front view) and one vertical line. And sometimes when I manage to click on the two lines, it says "the lines are parallel".
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