AutoCAD Inventor :: Drive Constraints / Contact Solver / Adaptivity
May 24, 2013
Can an adaptive part (non involved in the drive constraint animation) bother the contact solver?
I have an assembly, with only one adaptive part, i have activate contact set for other 3 parts (not the adaptive part), activated contact solver and drive the constraints, but in the animation contact solver doesn't work at all.
So, i have tried to move manually the assembly (suppressing angular drive constraint) and the contact solver works fine.If i suppress the adaptive part the driving constraint and contact solver work perfect.
So i wonder... adaptive part can annoying the contact solver functionality?
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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 10, 2013
I am trying to constrain motion for the following design:
-Object constrained to vertical motion (a counterweight).
-Object constrained to horizontal motion along a track (a slider).
A cable runs from the counterweight upward, makes a 180-degree turn around a pulley, runs back down, makes a 90-degree turn around another pulley, and connects to the slider.
When the weight moves down 10 cm, the slider needs to move laterally 10 cm.I don't care about modelling the cable, but I do need to have the slider move as the weight moves.
I will also need to model a case with a more complicated pulley, where when the weight moves down 10cm the slider moves laterally 5cm (again I don't care about the cable, just the relative motion).
Is there a way I can do this without creating a series of planes and cylinders and using rotation - translation constraints to link the motion of the weight to the slider?
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Jan 28, 2013
I'm trying to run a simulation of 2 bevel gears without using the transitional/rotation constraint, but using the contact between the surfaces to simulate the rotation of the gears - basically I have an L-shaped shaft running through both centers and want to have the upper gear grounded, make the lateral gear rotate around its own axis - the goal is simply to see the contact between the gears make the side gear rotate around the vertical part of the l-shaped shaft, due to the contact forces.
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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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Jan 9, 2014
Assemble several parts from Solidworks through step profile.Part2 and part3(attachments) no static interference ,when driving constraints (driver) immediately a collision report appears.Additional,when restrain the part 3(attachments)and drive constraint(driver) meanwhile open the collision detection ,finally,part2(attachments) goes through the barrier no checking collision.
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Nov 3, 2011
Is it possible to assign keyboard keys (or joystick control) to drive constraints either in a model assembly or in the dynamic simulation environment?
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Nov 29, 2010
Simulation Frame analysis crashed when choose button Simulate. Write failed to connect solver.
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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 11, 2013
How to place an ucs on a part, with identical orientation as the containing assembly. I have placed a grounded workpoint in the part, on the assembly origin, but When it asks for a point to give the direction of X and Y, I am unable to select anything as I am in part edit. the only things I seem to be able to select are vectors on the solid. But those cannot be used, since the angles are different from the assembly's.
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Mar 18, 2003
I have created a standard part that has imates and all features are adaptive. When I create an assembly and then try to place the component I would like for the part to come in adaptive automatically.
For example I have a nightstand I am modeling. The top and endpanels are in the assembly constrained to each other. I have a standard top back rail that is set up in a library and is used in all cases. The rail width and thickness is always the same but the length is different. I have two imates set up on the rail so when it is brought in, it will snap into place with one end of the rail mated to one endpanel and the other end mated to the opposite endpanel. But since the part is not adaptive on input it dosen't work right. One mate works fine but the other doesn't snap into place. Once I make the rail adaptive then it works fine but I have to insert it into the drawing first then make it adaptive then move the imates into place. Is there a way to make it adaptive automatically when it is initially placed in the assembly.
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Jun 28, 2013
I started my project, the design is basically a bulkhead chassis design with multiple access panels on all 3 sides. I wanted all of the hole patterns on this assembly to be based on one sketch. So I created a base part inside the assembly, this part compiled of sketches and the sketches compiled of construct lines and points (for panel and chassis fastener hole patterns). This was going great, after learning a couple tricks.
Manufactuing had determined that I need to machine the holes on the chassis after welding. Which means I need to move the adaptive features, from the part files, to the assembly file.
So here is my problem, assembly sketchs are not adaptable? Either projecting to (from that base part file), or projecting from (from the assembly sketch to the part file). I tried both. How I should model this? How do I make weldment machining adaptive?
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Jul 1, 2013
I'm having trouble with a tangent constraint. I have an adaptive part in an assembly and it is a revolution. I am able to constrain the top and bottom of the part so that it expands and contracts with my assembly. But, when I go to constrain the sides of my part via the tangent constraint I get an "inconsistent constraint" error.
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Apr 4, 2012
I'm having problems using the "Project Geometry" command when I'm editing a sketch on a part, and attempting to project geometry from an assembly on the part.
Now in this example, this is the structure of my parts:
Assembly 1
-Fabricated Part 1
-Assembly 2
--Fabricated Part 2
--Fabricated Part 3
(Assembly 1 and Assembly 2 do contain more parts than what is listed, I just simplified it so I don't have to type out the hundreds of parts used)
Now, I want to project Fabricated Part 1 onto Fabricated Part 2. I use the following steps to do this, starting out by working in Assembly 1:
Double click on Assembly 2Double Click on Fabricated Part 2Create sketch on Fabricated Part 2Use Project Geometry command to Project Fabricated Part 1 onto sketch of Fabricated Part 2
This is where the trouble starts. When I try to project Fabricated Part 1 onto Fabricated Part 2, it gives me an error message of:
"Cross-Part projection failed because the sketch is in a part which is adaptive in another assembly"
Fortunately this is about as intuitive of an error message as you can get, simply Fabricated Part 2 is already adaptive in another assembly, and when you use "Project Geometry" it automatically makes the part adaptive to the assembly you are projecting from, and you can't have two assemblies driving one part, so it gives me an error message.
Only problem is, this is a part I just made, that isn't used in any other designs, and isn't adaptive in Assembly 2. Nowhere does it say which assembly the part is already adaptive in (I know it must have that info stored somewhere, as it needs to know what is adaptive where, I just don't know how to get to it).
Now that Projecting Fabricated Part 1 in Assembly 1 to Fabricated Part 2 in Assembly 2 doesn't work, I tried to Project Fabricated Part 3 in Assembly 2 to Fabricated Part 2 in Assembly 2, which strangely does work.
Basically whenever I project geometry found in Assembly 1 onto Fabricated Part 2 it fails with the above error message. Whenever i project geometry found in Assembly 2 onto Fabricated Part 2, it works. Neither Fabricated Part 2, or Assembly 2 are adaptive.
Now I'm wondering if this is a workflow problem. This is how these parts were made:
Assembly 2 is similar to another assembly found elsewhere called Assembly 3, the only difference is that in Assembly 3, I need to change Fabricated Part 4 to a different part, all other parts remain the same.
Therefor I open Assembly 3, do a "Save as/Save Copy As" and save it as Assembly 2. Now I need to make my changes to Fabricated Part 4, so I open it, do a "Save as/save copy as" on it, and save it as Fabricated Part 2. In Assembly 2 I then do a Replace on Fabricated Part 4 and replace it with my new Fabricated Part 2. I now make the changes I need to make to Fabricated Part 2.
I started at this company a couple months ago, and that was the workflow explained to me, and it seemed to work. I wasn't aware of any damage it could cause, as I haven't used Inventor before, so I went along with it. Since that time I'm working to implement Vault, and my knowledge of Inventor has increased, and I've become aware of a program thats called Design Assistant. I'm thinking doing the "Save as/Save copy as" function is keeping some legacy information of my old part, making it think it is adaptive in another assembly, when really it isn't, it is the part that I did the save as from.
So two questions: is using Save as/Save copy as a valid way to quickly copy designs, or should all copying of designs be done with Design Assistant?
Also, Is there any way to view where this part thinks it is adaptive in? The trouble I see, is using Save As has been done for a very long time here, so the part I did the Save As from, could have been Saved As from another, then Saved As from another, etc. etc., and it would be almost impossible to track down (if that is what caused the problem).
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Mar 15, 2012
I want to put a cable tray going from a sliding door to a fixed piece of steelwork. When the door opens and closes, I want the cable tray to adjust to suit the sliding door. I'll upload the file that I have made. When i drag the sketch it all moves accordingly, but when I placed in the assembly and make it adaptive it does nothing, it will not constrain and it will only bring up the errors.
Inventor 2012
Windows 7 64-Bit SP1
Intel(R) Xeon(R) CPU X5570 @ 2.93GHz
NVIDIA Quadro FX 3800 (Avail. Graphics Memory 4067MB - Ded. 1024 MB)
12 GB RAM
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Apr 2, 2008
I'm trying to set up a rig of telescoping masts where the smallest mast extends completely before pulling the next mast which extends completely before pulling the next, etc. I'm having a really hard time figuring out how to set it up properly. I want an easy way to do this as I have many different mast sets to animate.
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Mar 28, 2012
Look at the attached snips. The assembly icon is strange to me. and I can not
set it as a contact set because it is greyed out. Is there any way to set this as a contact set?
Inventor 2012
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Jan 7, 2014
Why is a part in an assembly not enabled for contact set? on right click the Contact Set option is grayed out, but that part was in contact set for another part already. i made some changes in the part, maybe that's the reason, is it?
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Mar 20, 2012
Attached is a screen snipe of design that has a hydraulic cylinder in it. I've created contact sets for the rod and the cylinder however they keep breaking appart especially when I insert them into an assembly and drive to drive the constraints in a positional representation.
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Oct 25, 2012
i drew a cylindrical cam using the inventor tool then i also drew the actuator ( a simply plate rounded on top) but when i add the contact tangency link between the two surfaces and i move the cam , the two objects interpenetrate!
i'm using inventor professional 2012
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Feb 12, 2013
I'm working on a FEA of a climbing carabiner (oval-shaped; one side of the oval is a gate which opens and closes allowing a rope into the carabiner).
The gate of the 'biner has a hook which attaches to the "nose" of mainbody/biner. However, this hook does not engage until the biner slightly deforms.
I've attempted to use the separation/no sliding contact option, but the solver behaves as if there is no contact occuring. The nose simply passes right through the gate hook.
The initial gap of the system is about 0.040". That means the nose must deflect 0.040" before the contact surface comes into play.
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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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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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Apr 3, 2013
I am using Invertor Dynamic Simulation and I need to know the 2D contact position data to be displayed in the output grapher (i.e. the x,y,z coordinates). Only the forces are computed in the output grapher. I’ve tried using the “trace” feature but this will not allow me trace the 2D contact point. It would even benefit me to know the angle of the normal force relative to the absolute frame.
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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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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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