Model of translation piece

[petrxn]

Hello,

I am trying to model simple translation piece from rectangular to circle (one quarter). There is angle between rectangular side and circle side. I am able to model it very simple, but I have found that Inventor make some errors with lofted flange. Usually this type of translation piece should have flat triangles on the ends and bended triangles in corner. Unfortunately for some combinations of width/depth/diameter Inventor does not keep this rule and add some bended triangle to end edge.

Enclosed is pdf file with picture how this part should look, what is the problem and finally the ipt file is enclosed too. The part is ok with parameter SizeY=250mm and less and is wrong for bigger SizeY (for example 600mm)

Could I ask someone to help me design this kind of part to be correct?

Inventor 2014

Many thanks

Petr

[rdyson]

Try this one, may need a bit of tweaking.

[petrxn]

Thanks, this your model does not have perpendicular edges on rectangular side. See attachment.

I am still do not have idea how to solve it.

Thanks,

Petr