AutoCAD Inventor :: Unique Solutions For Sketch Constraints
Mar 26, 2012
One of my frustrations with Inventor is the difficulty of constraining a sketch so that the solution is unique. It is an issue when alternate solutions appear while making adjustments.
As a simple example, suppose we have an adaptive work point. This point can be solved to be at a distance L from the origin, but could be in any direction meaning the part can rotate freely.
Instead of a work point, consider using an adaptive sketch point constrained vertically from the origin. When solved at a distance L from the origin, the part can rotate around the vertical axis (as one might expect when fixing two points), but it can also be flipped with the sketch point located in either the positive or negative vertical direction. Is there a way to ensure a solution is only found in the positive vertical direction?
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Apr 23, 2012
Why do we not have the "=" (equals) constraint option in 3D Sketch mode? It seems like a very basic need for a constraint. Is there a reason why one should NOT want to have an "equal" constraint in a 3D Sketch?
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Oct 13, 2011
I've just installed 2012 and I seem to have a problem with constraints.
The basic problem is that the SHOW CONSTRAINTS command doesn't show the constraints for geometry that clearly has them. For example, if you delete a horizontal constraint from a line and then add a horizontal constraint to the same line, the line will be constrained but the constraint will not show up.
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Nov 11, 2013
Does Inventor (2012) have the option to view sketch constraints as a list? I feel like I am playing pictionary trying to find out what constraint is what and what it is constraining and it doesn't work that Inventor stacks anything nearby on top of each other.
I've attached a file showing what the problem is, please don't judge the model tree. I was prototyping as I went so it is messy.
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Aug 28, 2013
When you're working on a sketch in the part environment the status bar shows the number of constraints needed to fully constrain the sketch. For example "2 Dimensions Needed".
How do you retrieve this value using Visual Basic Net?
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Aug 1, 2013
I use 3D sketching frequently as a means to generate frames with the frame generator.
I notice that the constrain group no longer contains an equal length tool, as in a simple 2D sketch. This is where i would generally select two lines, and constrain them to be equal in length.
Is there a reason for this omission? Should I be worried that my menus are not showing the full options for constraints?
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Aug 10, 2012
I need to drive more than one constraint at a time. The assembly consist of a hydraulic ram that pulls a cable which is routed around a few pullys and then pulls another linear moving member. I don't really care about modeling the cable right now, I just want the cylinder piston and the final member to move in unison. I can only drive one constraint at a time, so I figured I could relate the two constraints together by setting them equal to a parameter (variable), but that isn't working. Is it me or is driving multiple constraints at a time something that would be very useful for a lot of applications?
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Aug 28, 2013
I'm modeling cables running through a series of cable clamps. I'm working in an assembly with my structure as one part, clamps as seperate parts, and cables as separate parts. I modeled the clamps first and am using them to create my 3d spline to run the sweep. The clamps have moved several times and each time, the sweeps (cables) do not update to follow the new clamping path. I have tried multiple ways of solving this.
I've tried to redo the splines using "Include Geometry" and running the spline through the centers of the clamps. I've also deleted the constraints (which for some reason turn into fixed) and reapplied them as coincident constraints. However, once I setup these coincidences, they always change back to fixed.
In a last ditch method, I've created 2d sketches at EVERY clamping location (yes that's alot of sketches, time and effort) and projected the circular geometry to get a center point. This has seemed to work, but is so much work, there's no way we could use it regularly.
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Nov 26, 2012
Any macro to do it automatically....
i still have the change occurrence layer based on material macro but cant seem to find the change layer based on part...
yes we are still using autocad in conjunction with inventor, and on a side note have been quite enjoying the new parameters, dynamic blocks, easy scripts and customization features in autocad.
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Feb 17, 2012
I have created a frame using the frame creator with all the individual members listed in the frature manager. When I check this into the vault it goes in fine.
When I create a second frame (seperate frame file) it uses one or two of the same fram types as the first frame. The problem comes when I go to check this into the vault it says the member already exists.
I have been told and I am seeing it that the frame creator always starts with "001" and numbers downward in creating the member names. This creates a problem in the vault because of the duplicate file factor.
What I ended up doing was calling up that particular member and doing a file save as then replacing it in the assembly. Then it would check in fine.
Is this the only work around or is there a setting somewhere that allows unique names for these frame members.
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Jun 5, 2013
The TextBoxes don't have a Name property or an UniqueIdentifier property. So, I don't know how to find a specified TextBox.
I've tried to add a XML comment by code in the FormattedText property and got an error.
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Jan 20, 2012
I'm having some problems giving certain parts in my assembly a unique file name. Im reorganizing all of my projects in a
- content center
- designs
- libraries
way, where my projects are under designs and commonly used parts under libraries.
Now i have something like a pump. I can derrive this assembly into a solid and put it in the content center, or keep the assembly and put it in the libaries folder. since this is a part i use in multiple projects.
Now my problem is that this pump has a different name in every project, and a library part doesn't allow me to change this name. Say standard name is "centrifugal pump" while the name in project 1 would be P101, while in project 2 it has to be named P501 and so on in order to match with the flowcharts.
Is my only option here creating a solid out of these components and putting it all in my content center ( leaving my libraries folder totally empty ), adding it as a custom part afterwards ( so i can rename it ). I rather have it in my library folder, since this will keep my design folder organized without hundreds of duplicates of this pump, using different names. Besides i rather have it as an assembly so i can assign the connecting tubes of the pump to different sub assemblies of piping.
Different example, a butterfly valve excists out of 3 parts. the valve itself, and 2 connecting tubes. possible to dissemble. all 3 parts need to have the same file naming say XV900. 1 side of the valve needs to be assigned to pipe-01 while the other side of the valve needs to be assigned to pipe-02. Content center doesn't allow me to split files, but allows me to use unique file names. A library party allows me to split files ( if not read only ) but doesn't allow me to change names.
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Sep 21, 2011
I've created a shared sketch and have used it with various features. Sometime those features are suppressed. The model works fine but the shared sketch generates a sketch doctor error because the feature that created it has been suppressed. Is there anyway to make the sketch suppressed so it doesn't trigger a sketch doctor error? Inventor 2013
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Sep 20, 2012
How do I duplicate the 2D line work from a part level sketch into a drawing level (overlay) sketch?
I started a simple 2D piping system diagram sketch by opening a new part file and using a sketch to stick draw the system schematic including some annotations. Then I opened a new drawing file and made a base view of the part file to bring a view of the original sketch into the drawing.
I realize now that it would have been much easier to have created the schematic directly in a 2D sketch at the drawing level, which would have made editing the annotations much easier at the drawing level, and there is really no need for the part file to exist. I have no intention of creating a 3D model or "real" part in the .ipt file, was just using it as a jumping off point to sketch.
I was thinking that I could correct my error in judgment by just copying the sketch and pasting it into a new sketch on the drawing, but it doesn't want to work that way. I have tried copying both the whole sketch at the browser level, and the entire sketch contents (all of the lines and annotations) from the opened part sketch, but when I attempt to paste either of those into the drawing, paste does not seem to be an option. I'd rather not have to draw the whole thing again, as in typical fashion, my once simple sketch has grown in proportion and complexity from its simple beginning.
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Dec 3, 2013
I was trying to query some sketch points data from a profile Path using code as below. However the program stopped without telling the reason.
Code below:
i = 0;
foreach (ProfileEntity oSourceProfileEntity in oProfilePath) { switch (oProfilePath[i].SketchEntity.Type) { case ObjectTypeEnum.kSketchArcObject: { SketchArc srcSkArc = default(SketchArc); srcSkArc = (SketchArc) oSourceProfileEntity.SketchEntity; // error points[i] = srcSkArc.StartSketchPoint.Geometry; break; } default: { SketchLine srcSkLine = default(SketchLine); srcSkLine =(SketchLine) oProfilePath[i].SketchEntity; // error points[i] = srcSkLine.StartSketchPoint.Geometry; break; } } i++; }
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Aug 1, 2011
First we imported an ".igs" file to inventor, which produced "wires". Then by promoting the wires it produced a 3-d sketch.
The model is in one plane and 2-D, and we are trying to use Ansys 2-D analysis, but in-order to do so it needs to be in a 2-D sketch.
The model is too large to be redrawn on a 2-D plane, how to convert it to a 2-D sketch
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Dec 14, 2012
want to change sketch 2013 into the sketch of 2010
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May 30, 2013
When I edit certain sketched some other sketches disappear. see attached.
This is causing modelling to slow down as I can not project lines from the sketch that has disappeared.
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Aug 22, 2012
After I create a adaptive part from projected sketch. How to modify the sketch? Please see the part attached.
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Mar 4, 2012
what is the difference between a sketch and a planar sketch?
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Aug 16, 2012
I'm having trouble with constaints, I'd like to constrain my sketch to a point in another sketch on a different plane. Is this posible in Inventor? If so how? If Inventor works differently how would you get a points in one sketch to be linked to points another?
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Feb 16, 2012
All I need to do for now is to align one part to the center axis of another part. Later I will constrain but for now I just need to see where the two meet so I can project geometry onto a draw surface. So, all I need to do is make their central axes coincide on one straight line.
I can achieve the same result by counting the various lengths but I'm hoping there's a simpler solution.
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Aug 20, 2012
Assume a beam like the one in the picture below.
How must I configure the constraints?
The left constraints should be a "Fix constraint" on the edge(not the face) I assume.
But the right constraints must not fix all DOF's.
How can I configure the right constraint?
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Aug 12, 2012
is it possible to copy and paste parts in an assembly but also keeping any constraints set on the part?
I.e. if I had a square block constrained to a flat face of a floor, when I copy and paste the block many times I would like all the copy blocks to still be constrained to the floor.
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Sep 6, 2012
Is there a way to get a list of constraints that exist between two parts in an assembly?
It will take forever to go through each and every constraint for one of the parts, checking the "Other Half" of each just to find all constraints between to specific parts.
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May 22, 2012
I'm trying to build a c# program where I can test a simulation for a robot project I have made angle constraints in inventor and now I want to be able to send numbers to specific joint.
With the code listed below I can get all the constraints from a selected part and get the name of the specific constraints.
I find it confusing that most of the documentation is in VB so this is what I have discovered on my own, perhaps this isn't at all the way to do it.
Inventor.SelectSet selSet=asmDoc.SelectSet;
try
{
[Code].....
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Nov 22, 2013
Trying to create a gimbal with a supporting frame, an outer square frame, and an inner square frame. when i insert the outer square frame into the supporting frame, i constrain it so that the axis of the hole i have drilled in my frame and the axis of the hole through my supporting frame are aligned, i then constrain a face of it to be a set distance from a parralel face of the supporting frame to centralise it. this works ok, and i can rotate this frame as i like. When, however i insert the inner frame and constrain the axes of the holes drilled through it to the axes of the other holes drilled through the outer frame, and two faces to be a set distance apart, it allows me to rotate my inner frame, but no longer allows me to rotate my outer frame! what have i over-constrained?
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Mar 27, 2012
I'm using the line tool in a 2d sketch. First, I draw a polygon with the tool. Then, when I come to move one of the lines with the mouse cursor, it detaches from the other lines, and becomes a single floating line on its own.
As far as I can tell, it has nothing to do with the fly down constraint menu options, but i may have changed another option elsewhere in inventor and not have realised it.
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May 6, 2013
Using "drive constraint" I would like to simulate the action of a "soft close" mechanisim on a drawer...fast movement for the first portion of travel, then slow movement for the very last portion of travel...
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Nov 4, 2011
I have some "insert" constraints for DIN rails in holes. I've moved the holes, but the DIN rail doesn't move. The refresh button isn't "lighting up", or when it does, it does not do anything to move the rail. Is there something that's been "shut off" to keep things from moving?
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May 24, 2013
Are there any C++ samples of the use of C Assembly Constraints? The syntax is so much different with VB a few real examples would be really useful.
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