AutoCAD Inventor :: 3D Sketch Equation Curve - Creating Coil?
Jul 26, 2013
I am trying to create a coil which from above, retains equal and thus parallel pitches whilst at the same time adheres to a semi-circular form in the cross section. You can see from the images attached that the first two revolutions are larger than the semi-circle outline.
These are the values I have used:
Cylindrical
r (t): 134.56924424045517662353735770102mm * t * 0.5
q(t): 1 deg * 360 ul * 3.0 ul * t
z(t): 10 mm * 6 ul * 0.5 ul * t * (1.5 * t) * t
tmin: 0 ul
tmax: 0.916 ul
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Mar 17, 2013
I'm just starting out with learning equation curves in Inventor.How can I get this curve
r(t)= ti + 4cos tj +9sin tk; where t is greater than or equal to 0
how to get this VBA as an equation curve
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Feb 19, 2013
I want to draw hyperbola curve whose equation is x^2/a^2 - y^2/b^2=1. May I use equation curve tool to make the above hyperbola.
I have also made a hyperbola curve of aforesaid equation through conventional method on mathematical ground in the past.
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Dec 11, 2012
I'm trying to use the equation curve to draw a super ellipse.The formula I'm trying to translate for inventor is the following.I'm guessing this should be possible using the abs() for the first section and an IF() statement for the second. The problem is Iäm not even getting the abs() to work at all. How to translate this formula?
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May 10, 2012
Trying to do something as simple as y=x^3 (Explicit Mode). Set xmin = 10, xmax = 20 then tried y(x) = :
1in *(x^3) -- no good
(x^3)/1 in -- no good
(x/1 in)^3 -- no good
Error is that "Equation y(x) contains errors. Expected units are length".
The point here is: Why should typing in such a simple equation as y=x^3 be so difficult??? Can't even do (x*x*x)/1 in & make it work.
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Feb 15, 2013
Can i make an Equation Curve such that it is dependent on a parameter from my Parameters list?
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Jun 21, 2013
What are the parameters for a parametric 3D Equation Curve to create a path for a coil similar to that in the attached image?
Or alternatively tell me how I can produce the coil in some other way!
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Jun 22, 2013
what the 2D or 3D equation curve for a parabolic spiral, otherwise known as a Fermat's spiral would be? I have found this info but do not know how to apply it:
Fermat equation
Therefore in terms of the affine plane its equation is
The Fermat curve is non-singular and has genus
I have also found this: $r^{2}=a^{2} heta $
Please see image attached.
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Jun 20, 2012
You can create a variable pitch helix by using the Equation Curve feature introduced in Inventor 2013.
Create a new 3D Sketch. Start the Equation Curve command.
Here are equations that I use to create helical curves. Many other variations exist.
Cartesian coordinates:
x(t) = radius * sin(360 * num_turns * t)
y(t) = radius * cos(360 * num_turns * t)
z(t) = height * t
[Code]....
When you sweep a profile along a helical path, use the plane normal sweep (instead of perpendicular sweep) to orient profiles suitable for coil or spring. In the example below, the sweep path is a constant radius, variable pitch helix.
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Nov 27, 2013
I would like to create an equation driven curve with inventor. I have no problems plotting the function in a plotter, however, inventor won't accept my equation. It gives me the error message, saying: "The equation contains unit errors". I'm using the explicit equations.That's the bare equation:
"y=sqr(2)*16.5/2/sqr(pi)*sqr(arccos(1-2*x/50)-(sin(2*arccos(1-2*x/50))/2))"
I modified it, inserting variables which I defined also in inventor, leading to this:
"sqrt(2)*height/2/sqrt(PI)*sqrt(acos(1-2*t/length)-sin(2*acos(1-2*t/length))/2))"
But both equations are not accepted by inventor due to unit errors. In this design, I'm using the metric system, millimeters, so I don't understand why and how I have to redefine this for the equation in order to get it working.
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Mar 15, 2013
Is there a way to graph a curve using an equation over a closed interval in Inventor 2012? I know I can draw a spline through points that are solutions of my equation, but this does not guarantee that the curve is the graph of my equation.
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Nov 8, 2012
create an ellipsoid with a hyperbolic funnel on the end.
How can I join an equation curve to an ellipse to create revolved ellipsoid shape? I also have alias and fusion if these are needed.
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Sep 25, 2012
Is there a way to unfold a coil shape to get the flat pattern? When I try to unfold the attached part I get an error message (see attached error_msg.jpg). We have been using AutoPOL to unfold these kind of shapes (which works fine). But since we have a very old version which we really need to upgrade, I was wondering if nowadays Inventor could handle coil unfolds.
If this will not work with the current IV2013 release, will this then be implemented in a future release? Are there any alternatives or should I just go for the AutoPOL upgrade?
IV2013 Pro SP1
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Jan 14, 2013
can we coil a coil in nventor?
If I have a coil or spring, the I want to coil that coil/spring around another axies, can I??
I use Inv.2012
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Aug 10, 2011
Can I create a specific curve in latest released version of AutoCAD by an equation?
If yes, what version of AutoCAD is it, and also how to enter the equation?
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Apr 17, 2013
Much of our work is structures fabricated from steel plate. One of our practices is to add a note " (SK) " to the description of plates that have a detailed sketch somewhere in the fab drawing set (simple rectangular or circular plates with no additional features do not get these detailed sketches). The actual "detailed sketch" is just a dimensioned drawing view of that plate.
I've been working on automating this process so that Inventor can actually determine for the user whether or not the sketch is required. I have it in certain part templates by default. Other templates add the note automatically through iLogic when certain plate features are selected, or when the model consists of multiple part features.
This leaves one remaining case that the current set of rules can't catch - when the user creates cutouts, notches, etc. by modifying the sketch for the original extrusion. I have determined a method for catching that case, but haven't yet figured out how to program it.
What I want to do is count all of the lines, arcs, and circles in the first model sketch. If that count returns a number other than 4 lines, the note will be added. If any arcs are detected, the note will be added. If any circles are detected with lines also present, the note will be added. There may be other cases that will come up in testing that need to be covered, but I ran into an issue before I got that far. Construction geometry messes up the count - I need a way to exclude it.
Below is the test code I have so far for the counter. what techniques I can use to get construction geometry out of the count. This code doesn't include the provisions for actually adding the note yet - I'm just trying to get the counter working right first. Instead it's just displaying the total count in a message box for test purposes.
oDoc=ThisDoc.Document
oSketch=oDoc.ComponentDefinition.Sketches.Item(1)
LineCount=oSketch.Sketchlines.count
CircleCount=oSketch.SketchCircles.count
ArcCount=oSketch.SketchArcs.count
TotalCount=LineCount+CircleCount+ArcCount
MessageBox.Show("Total Count "&TotalCount, "Title")
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Jan 13, 2014
I'm building a product configuration which includes some helical curves. I want to find out how I can change the direction of a Helical curve feature in a 3D sketch.
Variables like pitch and diameter are parameters, but the direction isn't.
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Sep 14, 2012
I made a bunch of lines, then used the bend command to make curves where they intersected. I'm trying to put lines connecting A to C and B to D. How do I constrain the ends of the lines to the center of the curves?
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Sep 19, 2013
I would like to use a sketch as the basis for a rectangular pattern which is set up to use the curve length for both directions of the rectangular pattern so that when I update my rectangle in a sketch, the pattern automatically adjusts to the new sketch. I have sketched a rectangle, and used one leg of the rectangle to establish the direction and length of one dimension of the array.
However, when I try and choose the Direction 2, my only options are the entire rectangle or faces- I can no longer select other and choose a single side of the rectangle.
I was able to accomplish what I wanted by using two sketches, with the second sketch simply projecting one leg from the first sketch. Using one sketch just seems inherently safer than trusting projected geometry.Is there a way to accomplish this with one sketch instead?
Inventor 2013 (SP2 Update 2), Windows 7 Professional (64-bit), SP1, Intel Xeon 3.07GHz CPU, 12GB RAM, NVIDIA Quadro 2000, Vault Basic 2013
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Nov 1, 2013
I am trying to create a 3D sketch of a helical curve that has an accelerated pitch.
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Jul 29, 2013
I am trying to write a script to draw geometric figures in Illustrator.I want to achieve this by writing an equation into the ESTK, for example x^2 + y^2 =100. This should generate a circle with a radius of 10 units.
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Jan 9, 2012
I'm trying to create a coil spring to go around a long bolt for bracing. I'm using AutoCAD 2011 MEP. I need to know how to make the path for the spring so I can sweep it, it does not have to be super accurate size-wise (it's more for representation purposes) but would still like to know how to do it..
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Dec 17, 2012
One of our senior designers seems to think there is a setting when creating a sketch that will automatically dimension.
So if a straight line is draw and 5 mm length is entered a 5 mm line will immedialtey be created, he seems to think that you can then immedialtey Dimension said line??
I can't find anything, settings wise?
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Oct 2, 2013
I have problem with creating of a Rectangle in a sketch. I would like to make a profile in assembly and then make a "revolve".
Dim oAsmDoc As AssemblyDocument
Set oAsmDoc = ThisApplication.ActiveDocument
Dim oCompDef As AssemblyComponentDefinition
Set oCompDef = oAsmDoc.ComponentDefinition
[code]..........
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Aug 26, 2013
After I create a sketch, how do I center it about the origin? The origin is projected, I just can't figure out how to set the sketch about it.
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May 21, 2013
I've got a problem with creating Path in Inventor VBA. I've created a source block definition in SourcePart.ipt, derived it in DestPart.ipt, placed this derived SketchBlockDefinition in Sketch3 and draw 3 extra lines. Now i want to add a SplitFeature with SplitTool as a Path of 3 lines, but first i need to create this Path. There is no problem with creating path from this 3 extra lines, but when i want to create path from lines that belongs to derived block - an error occurs.
Below is sample code (also included in attached file - DestPart.ipt). Try run it with DestPart.ipt as an active file. When Inventor is prompting for Selecting Sketch Entity first select one of 3 extra lines, macro ends with no errors. Then run it again, this time select one of 3 lines that belongs to SketchBlock - an error occurs.
When you try to add SplitFeature (Trim Solid) by UserInterface Button "Split" there is no problem with any set of 3 lines.
Sub CreatePathTest() Dim oPartDoc As Inventor.PartDocument Set oPartDoc = ThisApplication.ActiveDocument Dim oPickedSketchEntity As Inventor.SketchEntity Set oPickedSketchEntity = ThisApplication.CommandManager.Pick(kSketchCurveFilter, "Select Sketch Entity") Dim oNewPath As Inventor.Path Set oNewPath = oPartDoc.ComponentDefinition.Features.CreatePath(oPickedSketchEntity)End Sub
My System is Windows 7 32bit/64bit, Inventor 2012
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Apr 18, 2012
I have a problem when I`m creating a new part in assembly.
I`m in assembly and I push a create button. Then I give it a name and OK. Then I push a plane where I want to make the part. New sketch comes but no sketch panel. I have to push right button from mouse and click finish sketch. Then when I go edit sketch the sketch panel comes like it suppose it to be.
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Jan 23, 2012
Can we now toggle "sketch only" geometry when creating drawing view sketch transient geometry in the Inventor 2012 API?
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Mar 18, 2013
I am trying to creating an extrusion with a sketch containing multiple circles. However, the AddForSolid() Method is not working properly, returning non-NOERROR is C++. Below is the code that I used to create a sketch(which is succeeded) and then try to create a extrusion (in my case cutting).
ApplicationPtr pInvApp;pInvApp.GetActiveObject("Inventor.Application");DocumentPtr pItem;pItem = pInvApp->GetActiveDocument();PartDocumentPtr pDoc;if(pItem->GetDocumentType() == kPartDocumentObject)pDoc = pItem;SelectSetPtr selectedItem;selectedItem = pDoc->GetSelectSet();FacePtr face;//printf("
[code]....
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Jul 18, 2013
What I would like to do is create a custom dialogue for each of 3 or 4 standard sketch symbols we use on a regular basis. I'd like to load 'suggsted' values out of an excel spreadsheet and allow the user to pick from them or enter in a custom text string if required. The values would then become part of the sketch symbol.
I've spent some time looking into iLogic rules and I think I've determined that they're not flexible enough to do what I want.
If I'm correct, it is possible (or a good idea) to do this using a VBA macro? I'm a little hesitant to go down the full blown add-in route. While I'm pretty confident I could work it out.
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Oct 22, 2013
I made a coil with taper. Now I want to make a drawing with that taper, but I don't know how to do that.
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