Sliding cone inside cone - how to constrain?

[Anonymous]

Hi all,

I'm having trouble figuring out how to contrain my "pipe expander".  The turquoise cone shaped part slides against the red shaped die (there are 3 of them, like pie pieces, and the slide outward).  How can I contrain this properly, or am I only able to do this in a dynamic simulation?

[Frederick_Law]

You might need to use sketch in the part to constrain.

In reality, the cone won't have full contact.

[JDMather]

I would use Insert to contact diameters. (Might Split face or use Sketch.)

Attach your assembly here if you can't figure it out.

[mcgyvr]

Center axis to center axis allows it to "slide" as intended..

Then a face to face mate with "limits" will allow it to slide in a specified range.

However just using an insert constraint with limits can do the same in only a single constraint.

[johnsonshiue]

Hi Chris,

Yes, this can be done using Cylindrical Face Mate in assembly constraint. Start the Relationship command -> Mate -> select the cone face (select other) and select the other cone face. If both have the same taper angle and radius, they will be mated.

Many thanks!

[Anonymous]

this does not help me with motion....I need the parts to slide.

After I use the axis contraint, how can I keep the parts from colliding, as shown in this screenshot?

[JDMather]

The answer has already been given.

I assume you haven't figured it out from the textual responses - so it would probably be best to Attach your assembly here so  that someone can demonstrate with your actual files.

[Anonymous]

The answer has not already been given.  I assume from your response you don't understand how the assembly works.

[Anonymous]

here are the parts in question.....I cannot get the contraints to solve with the instructions provided so far

[JDMather]

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@Anonymous wrote:

  I assume from your response you don't understand how the assembly works.

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Probably a good assumption.

[mcgyvr]

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@Anonymous wrote:

here are the parts in question.....I cannot get the contraints to solve with the instructions provided so far

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@Anonymous  Chris, You need to also include the ipt files. AN iam file only links to the files on your computer and does not include them in itself.

You can put the iam and ipt files into a zip file if you just have a few (we only need the 2 parts (red and blue) to show you how this is achieved) or with more complicate assemblies you can use "Pack and Go" which is a function included with Inventor to gather all the necessary files and zip them up to share..

Just zip up those 2 parts and attach them here..

The answer has been provided though and thats using "limits" with either a face mate or an insert constraint to limit motion up to the point of collision along the axis.  But please post those 2 parts and we will create an assembly with the constraints needed.

Oh and please post the version of Inventor you are using as files aren't backwards compatible..

[mcgyvr]

@Anonymous  Actually.. See attached..

Using a single insert constraint with a limit..

Drag the inner cone and it will move out/in until it collides..

[Anonymous]

Sorry should have known...

[Anonymous]

I need the inner cone to slide, touch the outer cone, and push the outer cone away, with no clearance between the parts

[johnsonshiue]

Hi Chris,

You probably did not follow my instruction. I was not talking about Axial Mate. Mate constraint allows multiple types of selection. You need to right-click on the cone face -> Select Other -> pick the face, not the axis. See the image below and the attached file.

Only one mate is needed. There is no need to use Angular constraint or Limit or Contact Solver.

Many thanks!

[mcgyvr]

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@Anonymous wrote:

I need the inner cone to slide, touch the outer cone, and push the outer cone away, with no clearance between the parts

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Then you need to select the inner and outer cone and right click and select "contact set" so that one will react when the other contacts it.  You also need to go to Inspect tab and ensure "Activate Contact Solver" is turned on..

It wasn't clear from your initial post that you needed one to react to the other. 

Using contact solver along with the constraint suggestions you have received should get you to what you need.. 

[Anonymous]

using only a mate constraint will not allow the parts to slide axially aligned.  

When I use the suggestions given in this thread, with contact solver & contact set, the parts do not behave as I wish - the inner cone will move until it makes contact with the other, then it will stop.  When I keep moving my mouse, the part suddenly jumps out of contact.  The inner cone will not "push" the outer die up and out of the way as I need it to.

[johnsonshiue]

Hi Chris,

I am sorry I am confused now. The solution I posted (#15) solves the problem properly. I don't understand why it does not work for you. There is absolutely no need to use Constraint Limit or Contact in this case. The "Cylindrical Face Mate" is the answer.

Please take a look at the file I attached to the reply (or here) and see how it was done. If it still does not work, please your attempt.

Many thanks!

[Anonymous]

Attached is a screenshot of your solution, which is not what I need.  The cylindrical mate does not allow the relationship I am looking for.  When I change the mate offset, the parts interfere, as this screenshot shows.  I am asking for a solution to allow the blue tapered face to push against the yellow tapered face, with zero interference.  The parts will start out on the same plane & aligned axially, but as soon as the blue cone moves into the yellow face, I want the yellow face to move outward radially, but the faces will have zero clearance.