Mating Conical Faces

[Anonymous]

Hi, I've been struggling with an issue for a few days. Is there a way to mate the outer face of one conical part to the inner face of another conical part. Both of my parts are based on the same geometry i.e. the same angle of the cone. When I do try to mate the parts Inventor gives me the warning 'The assembly cannot be solves. The new relationship conflicts with and existing relationship.' even when this is the only relationship in the assembly.

Does anyone know of way to get this to work?

[SBix26]

Can you post an example assembly where this is a problem?  This works for me as you have described, so I wonder what is different with your workflow or parts?

Also, please let us know what version of Inventor you're using.

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Sam B
Inventor Pro 2020.0.1 | Windows 7 SP1
LinkedIn

[Anonymous]

Hi, I'm currently using Inventor Pro 2017 and I've attached the parts that I'm trying to mate along with the assembly file. I'm trying to get the part Door Slider mk2.ipt to sit on the conical surface of Hopper.ipt between the tabs that will act as guides.

I have tried to just mate the parts to the inner surface of the tabs, which works to align the part to the tabs but does mean that I have to be carful not to move anything so the door slider stays in place.

The reason I wanted to add these constraints is to double check my calculations on the placement and clearances of the other components

[SBix26 · Accepted solution]

For a conical face to face constraint to work, the conical faces must be the same angle, such as inserting a flat-head screw into a countersunk hole.  Your hopper conical surface measures 60.000727770° from centerline, and the slider surface measures 60.000000000° (but is not dimensioned in its sketch!!).  Mathematically, this won't work.

Now, advice that you didn't ask for: your modeling technique needs work... you're doing way more work than needed, and ignoring useful tools (such as Revolve) while using difficult and less precise tools (such as Loft).  You have lots of missing dimensions and constraints in your models, such as the  60° line I mentioned above.

Have you been able to follow the built-in tutorials or take a class?  Would make you a much more efficient and accurate modeler (as well as a less frustrated one, I expect).

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Sam B
Inventor Pro 2020.0.1 | Windows 7 SP1
LinkedIn

[Anonymous]

Hi SBix26,

   Thanks for finding the problem and for the advice. I'll remake the hopper with a revoled profile. I've been away for using Inventor (any CAD really) for a number of years but i'm looking to get back in to it. As you pointed out the loft was probably me trying to be a bit too clever for my own good and caused all my problems.

I'll keep practicing and going over the tutorials so I can be a bit more robust with my models.

Thanks gain for your help