Modeling Round to Rectangular Duct Adapter

[lightboss]

Can anyone help explain how to create a sheetmetal adapter that goes from rectangular duct to round? i'm using SE12 and have tried unsuccessfully to do it using lofted and swept protrusions in part module. Any help would be greatly appreciated.

Robert

 

[McLeod]

Either lofted or swept features should be suitable for this. The SE help files show examples in both sections in which a quadrilateral cross-section transitions into a round one. (See "Constructing Swept Features" and "Constructing Lofted Features".)

The tricky part is usually in getting the vertex mapping and any guide curves correct. How is your model failing?

 

[lightboss]

Hey there-
Thanks for the reply. I managed to fake a part using a revolved cutout on a rectangular protrusion. The reason I faked it was the diameter of the round end was larger than one of the sides of the rectangle. The relvoved cutout couldn't deal with that. So i widened the rectangle and faked my dimensions. Of course the drafting didn't look quite right, but I got a drawing out to a vendor who's not that fussy.

After seeing your suggestions, I went back and was able to do it easily...lofting the 2 profiles. I'm not sure where I was going wrong originally. The pressure of a quick deadline was causing brain cramps, no doubt. Thanks again for your help.

Robert

 

[rollacrc]

lightboss,
this can be done it took me awhile to get it to not fail on me but by trial and error...and only doing 1/2 at a time was able to do it. one thing i have noticed and really love about se sheet metal is if you can do in se they can do it on the floor w/ some convinceing from time to time. and if you can get se to do they can't do it on the floor.

 

[GrimmNel]

If the sketches you used for the lofted flange were prepared correctly then it should not matter what size your arc or rectangle is. The problem SE has is with linking up an arc with a straight line. Sometimes it works and some times it refuses. I always develop my rect. to round in 2 halves. I'll try and explain. Try and draw the arc with 5 elements. Picture half a circle with a straight section at the ends and in the centre. The straight section can be very small. Do the same with the half rectangle, but with a small radius in the corner. The reason for this is so that SE has a straight edge then an arc then a straight edge etc. to link up with. I have made myself a standard drawing linked to a spreadsheet to do this automatically. I have not found a rect. to round it cannot develop.

Regards
Grimm