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Odd loft feature glitch on parameter adjustment.

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Message 1 of 3
mta08pg
294 Views, 2 Replies

Odd loft feature glitch on parameter adjustment.

I am experiencing an unpredicted, erroneous behaviour in the attached part.

 

The rotor is composed of cylinder and a solid lofted between two 3D profiles. The attached part file is correct. To reproduce the error- change the "inlet_width" parameter from 12mm to 10mm or less (it is a parameter in "Blade Profile" sketch). On updating the part there will be infinitesimally thin solid layer on outer diameter of the cylinder.

 

Some features which need explaining:

-3D Sketch profile is a projection not from the "Blade Profile" sketch, but from a plane offset from it. This was first attempt at a fix. I suspected the original tangent work plane to intersect the cylinder.

-Creating a new solid body from loft was the only way to avoid errors such as "non-manifold solid".

 

I will be creating multiple versions of this part and I need to be able to safely adjust the "inlet_width" and "outlet_width" parameters. I will be grateful of any proposed fixes/workarounds to that glitched behaviour.

 

EDIT: The version is Inventor 2014 Educational.

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Message 2 of 3
mta08pg
in reply to: mta08pg

I have created a workaround:

One of the 3D sketches is now projected not on face of the cylinder, but a cylindrical work surface offset from it.

 

Still, I hope to learn if the error I encountered earlier could be predicted and if so- what is the best way to prevent it.

Message 3 of 3
JDMather
in reply to: mta08pg

I would create the part differently.

It worries me when I see things like Work Axis1 that is a duplication of the Origin Y axis.  Why would someone do that?

 

I would probably model the vane such that it was larger and then trimmed back.

I didn't spend a lot of time looking at this, but if possible, I would model the vane as a lofted surface and then Thicken and trim.

 

Another way you could do this is to do the Loft first then the Extrude - Intersect the outer cylinder.

 

 


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