AutoCAD Inventor :: Equation Driven Curve - Unit Error
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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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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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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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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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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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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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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Oct 22, 2012
Is there a way to use the curve driven (rectangular) pattern referencing two tangent curves (an arc and a tangent line). I'd like to be able to create this pattern of slots in one pattern, otherwise I'll have to make two cut features at each end and use one pattern for the straight and another for the curve.
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Dec 6, 2012
I'm trying to use the new arc length dimension feature in Inventor 2013 and I am having some trouble. After I apply a driven arc length dimension to a fully constrained sketch and then put user dimension in a user parameter I get an error when I rebuild the part. The error states the the dimension can not be solved.
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Aug 1, 2013
I'm getting a strange error with my iLogic code running parameters in my assembly. When I have one "if....then..." my rule runs fine. Even two statements work. But for some reason when I get to a certain number of statement I get an error: I've attached some sample code and snapshots of my error screens.
If FLANGE_STYLE_BOTTOM = "2in 150 BFV" ThenParameter("RD FLANGE:1", "OD")="6"Parameter("RD FLANGE:1", "BC")="4.75"Parameter("RD FLANGE:1", "HOLE_SIZE")=".75"Parameter("RD FLANGE:1", "NUB_HOLE")="4"Else If FLANGE_STYLE_BOTTOM="3in 150 BFV" ThenParameter("RD FLANGE:1", "OD")="7.5"Parameter("RD FLANGE:1", "BC")="6"Parameter("RD FLANGE:1", "HOLE_SIZE")=".75"Parameter("RD FLANGE:1", "NUB_HOLE")="4"Else If FLANGE_STYLE_BOTTOM="4in 150 BFV" ThenParameter("RD FLANGE:1", "OD")="9"Parameter("RD FLANGE:1", "BC")="7.5"Parameter("RD FLANGE:1", "HOLE_SIZE")=".75"Parameter("RD FLANGE:1", "NUB_HOLE")="8"Else If FLANGE_STYLE_BOTTOM="5in 150 BFV" ThenParameter("RD FLANGE:1", "OD")="10"Parameter("RD FLANGE:1", "BC")="8.5"Parameter("RD FLANGE:1", "HOLE_SIZE")=".875"Parameter("RD FLANGE:1",
[code]...
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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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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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Dec 31, 2013
I have ran an analysis and SSA gave me Error 607 on the report. It says "Inlet A9 gutter capture curve is not a valid curve."
A couple things I did different from the video lectures...
I selected user define for the Tc to figure out Q. i computed those manually.
For the Inlets I have selected Maximum Capture Cutoff.
There are some inlets in this model I created that do not capture 100% of the flow so i created conveyance links to account for the bypass flow.Not sure why is not recognizing the Curve?
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Nov 26, 2013
I need to make a model of saddle surface. The surface is given by equation z = y^2 - x^2, and I must have some thickness - It will be printed on 3D printer.
I have Inventor 2014 and I dont see possibility of making the surface directly in Inventor. Is there any trick for that?
I'm afraid I cannot use solution as stated here Equation-driven surface , because saddle surface looks like this hyperbolic paraboloid .
I tried this solution: I made 3D surface in Matlab, exported it in .stl and opened in Inventor - but this only makes the surface with no thickness. Functions extrude, loft require 2D sketch.
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Feb 22, 2012
Can an equation be used to calculate equal distances when using the rectangular pattern.Regarding the attached .ipt file i would like to place 25 holes in the X direction with equal gap size between each hole.Also how to calculate the number of holes in the Y direction again with equal distance between each hole.I have not done this before with equations but was thinking that i would need to use the Length x Width in the equation.Do i need to add figures into the Parameters box also?
The attached file with the Hole feature the sketch is not constrained for the purpose of using an equation so i know how far from the start of the part to get equal distances between each hole to the end of the part .
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Mar 7, 2012
I need to put the following into equation form to plug into a User Parameter:
if d91 falls in the range of 4" to 11"
then d92 = d91 + 2"
else d92 = 7.5"
Windows 7 Pro, SP1
Inventor 2012 SP1
Due to the nature of our business, I am not permitted to attach any files showing models or .idw environments of any actual work-related components.
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Sep 23, 2013
how can i access the value in this column using vba?
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Sep 24, 2012
I need to put in the polar equation r=e^theta. Is this even possible in autodesk? How can I do it? Should I spline through points instead?
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Jan 16, 2012
We have some equations in our templates which i have modified with iLogic. Once the rule is run it only shows the value and not the equation. ie i want it to show Thickness*2 instead of just '12'. The ilogic will say something like InnerRad = Thickness * 2 Is there a way to make it show the equation rather than the value? While i know whats going and can see the driven link in the parameters the planned change to 2012 could take some getting used to for users.
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Mar 23, 2012
I was trying to use ipart to create some parts and place the relevant dimensions in the table format in the idw file. However, the equation for the dimensions appeared and I like to have it as numeric. Also, the feature present or absent is preferred to be called "Yes" and "No" instead of "Computed" and "Suppress" respectively.
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Nov 2, 2011
I have an asssembly stack and I have a known bending moment at a given place (ie the datum). I want then to create a drawing of this stack up and show the bending moments at known locations beside the relative dimension.
Now I can do this manually no problem...but I would like this drawing to update automatically. ie the stack up height(s) change and i want the bending moment figure to update accordingly.l
Is there a way to do this with drawing dimensions? ie dimensions created in drawing mode?
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Oct 14, 2011
I have a small assembly with the parts. I'm doing an array (pattern) of one of the parts and I tried to do two things without success:
1. Tried to link one of the parts to the assembly itself with the equation tool ,but the software doesn't let me do it and says "...was rejected since it causes a cyclic dependency" - so what?:-) I know and need to do it!
2. After rejected the first choice, I tried to "project geometry" some stuff of the pattern I created in order to try and and make my connection in this way, but then I got a similar rejection: : problem encountered when doing cross part projection"...probably it's because it's from a pattern I'm creating from the part I'm doing this sketch inside?
What Can I do in order to bypass these remarks and make it somehow? Most important, Why can't one "tie" something from a part to its own assembly in which it's located???
Inventor 2012 Pro.
I7 workstation
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Nov 26, 2012
Is there any way in which the text of a text parameter, which is in the equation column, can be replicated into the nominal value column in the parameters table? I want to reference the value of the parameter in Custom iProperties but it always comes up as blank because it has no value.
I need it to update automatically, e.g not entering the value manually.
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Jul 25, 2012
Is there an automatic way to force a mesurement, to become Referenced? (driven)?
Even if sketch is not yet totally constrained?
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Sep 17, 2013
If I have a parameter in a sketch were I want to change side of the reference line in a other word I want to put in a negative value in the parameter to change side. I want to do this because I have used this parameter in other equations and want not delete it and replace again.
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Nov 16, 2013
I want to creat a driven dimension that I can use as a reference dimension in another part. Is there an easy way to do this without creating a new sketch, going into a previous sketch, making a long function based on other dimensions, etc.? For instance, just like the measure tool, but it stores the measurement.
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