Autodesk Inventor

[#1]

Hi there,

I am having a really difficult time trying to make a part adaptive. I will upload my assembly and parts in customer files as "adaptivity problem". I would really appreciate it if someone coud take a quick look at why my arrow won't become adaptive. I have set up an animation so that the assembly leans to 30 degress and i have an arrow that represents gravity that must stay perpendicular to the part called "road". As the assembly leans, I want the arrow to end on the road but if i constrain the arrow tip to the road, it throws up error messages when I try to animate in studio. Its as if the adaptivity isn't on but the part is adaptive and i have also made it adaptive in the assmbly. The assembly is called "assemblytest".

Any help would be greatly appreciated.

thanks

Jonny

[#2]

 You can post your files here. No need for customer files. What version of Inventor are you using?

[#3]

Oh, i presumed that is what it was for but i have attached my files here now. I'm using inventor 2010.

thanks

[#4]

I do not have much time for this, but It looks like you have gone a wrong direction.  Gravity does not change,  The road may/will. The arrow should be the first part (Grounded) - no need for any constraints.

If the road angle changes then Gravity will stay the same. 

I am assuming there is some type of load on the wheels above the road. as a result, As a result, then Center of  Gravity for the separate subassembly (call it loaded vehicle) will be impacted by the direction of  Gravity. If the vehicle is in motion, then Centrifugal Force will also come into play.

Are you planning to calculate all forces?

[#5]

Thanks for your reply,

No I am just showing the lean animation as part of a presentation and do not need to calculate forces. For disscussions sake, lets say that my arrow isn't gravity and its just a part, surely it should work as an adaptive part and one end of it could be constrained to the road and then shorten as the assembly leans?

I am not running this in dynamic simulation, just a simple animation with an adaptive part.

I have resultant and centrifugal forces but didn't include them in the uploaded assy as i am not stuck on those. Its only the arrow that I have included that isn't working.

Thanks for your advice.

[#6]

I noticed that your parts and assembly could probably be simplified quite a bit - extra workplanes and axis, sketches not constrained.

And watch out for this beginner mistake (see attached).  You tap drill size is incorrect.  If you used the Hole feature for threaded holes rather than extruded circles you would avoid making this mistake.

[#7]

Thanks for the input - thankfully i'm not going to be using these for manufacturing drawings so it doesn't really matter. There are many planes/axes because these parts are used in many assemblies and animations. There is no excuse for unconstrained sketches though!

I have attached a simple assembly - could someone please tell me why the arrow isn't behaving as an adaptive part even though adaptivity is turned on in both the part and the assembly? I should be able to change angle2 to 10 degress and the arrow should shorten as its adaptive but instead it gives conflicting contraints.

Thanks in advance

Jonny

[#8]

I've got a little closer to the solution - the arrow doesn't seem to work as adaptive if its constrained to a work axis - it does work when it is constraint to parts. Anyone aware of this?

[#9]

Using an adaptive work axis should be fine. From a quick look it appears the problem is that the work axis does not drive your sketch geometry and the axis is not adaptive. See the attached video for a possible solution. This does not solve the issues JD mentions, only the adaptivity question.

[#10 · Accepted solution]

Try this out.  I made a new arrow.