Autodesk inventor 2016 assembly constraints free. Place Insert constraints in assemblies
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- Autodesk inventor 2016 assembly constraints free
I am having a problem figuring out how to constrain two boards to maintain a constant angle with respect to each other. I have attached an Inventor example. I have two instances of "board" in the "assembly", and I want to have two pins connecting the two. Note that the two objects I want to connect may not be the same size or shape as shown in this simple example. So, I add the two pins with an "Insert" constraint to the corresponding holes in the one board.
Now, I add the second board. I constrain the first pin using the "Insert" constraint. Note that the top part is free to rotate around the bottom part. Now, I want to constrain this rotation. My normal reaction to this would be to add an "Insert" constraint on the second pin. But if I do, I get an error message that the constraint cannot be solved. But there is no actual conflict; just the assumption of a conflict. When I move one of the parts, the other will rotate based on some weird idea it has about what it means to slide two parts vertically relative to each other.
I want the boards to maintain their relative orientation under all possible conditions. And no, making these two boards concentric would not help, because they can still rotate. What I actually have are components which are fitting into a board through-hole parts and a very constrained space in which they have to fit.
So I'm placing the components, sliding the parts together to see where I have conflicts with the layout, and then modifying the layout until I get a feasible solution.
This may involve drilling holes in the boards to let the components slide through. But I have one component with four leads, and the boards just rotate relative to each other instead of sliding along linearly.
Suggestions as to what I should do would be appreciated. Note that comments like "This is taught in introductory courses on Inventor" don't help because I never had anything beyond the two-hour "Introduction to Inventor" seminar conducted by TechShop.
The manual examples are poorly organized and make assumptions of knowledge that are not valid assumptions. So I'm having to deal with problems as they arise. Go to Solution. Solved by newcomer. Solved by blair. Solved by wh. Walter Holzwarth Dipl. Not a problem here using the two insert constraints for the top plate and the pins. In a case such as this, a constraint on one of the pins to the corresponding pin hole and a mate constraint with the center axis of each plate would stop any rotation as well since the pin holes and plate center are on different axis.
You could also expand the Origin's folder for each plate part, decide which Origin-Plane would stop any rotation and place a flush or angle constraint on the Origin Planes. I have used this technique when I had two rectangular sliding parts. It is very clumsy, because I have to go to each of the two parts, turn on visibility of the axes, go to the assembly, add the constraint, then go back to the two parts and turn off the visibility.
When I had ten parts that went together, this meant visiting the parts far too often. I had hoped for a simpler, more obvious, strategy. And, it works well only when the axes are mated at 0mm offset; when there is a nonzero offset, it involves a lot of by-guess-and-by-golly adjustment of the offsets. Since objects are free to move in the 6-axis, it's always going to take 3 constraints to fix them.
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